diff --git a/index.html b/index.html
index ee1dd46..4de7ad4 100644
--- a/index.html
+++ b/index.html
@@ -243,15 +243,8 @@
                     </button>
                 </div>
             </div>
-            <button onclick="openPopup('user_popup')" aria-label="User profile">
-                <svg xmlns="http://www.w3.org/2000/svg" class="icon margin-right-0-5" height="24px" viewBox="0 0 24 24"
-                    width="24px" fill="#000000">
-                    <path d="M0 0h24v24H0V0z" fill="none" />
-                    <path
-                        d="M12 5.9c1.16 0 2.1.94 2.1 2.1s-.94 2.1-2.1 2.1S9.9 9.16 9.9 8s.94-2.1 2.1-2.1m0 9c2.97 0 6.1 1.46 6.1 2.1v1.1H5.9V17c0-.64 3.13-2.1 6.1-2.1M12 4C9.79 4 8 5.79 8 8s1.79 4 4 4 4-1.79 4-4-1.79-4-4-4zm0 9c-2.67 0-8 1.34-8 4v3h16v-3c0-2.66-5.33-4-8-4z" />
-                </svg>
-                <div class="user-id"></div>
-            </button>
+            <button id="user_popup_button" onclick="openPopup('user_popup')" title="Click to view user profile"
+                aria-label="User profile"></button>
             <theme-toggle></theme-toggle>
         </header>
         <section id="options_panel" class="flex hide-completely">
@@ -558,6 +551,10 @@
                 <h5>My FLO ID</h5>
                 <sm-copy id="user_flo_id"></sm-copy>
             </div>
+            <div class="grid gap-0-5">
+                <h5>My Bitcoin address</h5>
+                <sm-copy id="user_btc_id"></sm-copy>
+            </div>
             <sm-button class="danger" onclick="signOut()">Sign out</sm-button>
         </section>
     </sm-popup>
@@ -657,6 +654,13 @@
             <div class="entry__changes"></div>
         </li>
     </template>
+    <script id="lib" src="scripts/lib.js"></script>
+    <script id="floCrypto" src="scripts/floCrypto.js"></script>
+    <script id="floBlockchainAPI" src="scripts/floBlockchainAPI.js"></script>
+    <script id="compactIDB" src="scripts/compactIDB.js"></script>
+    <script id="floCloudAPI" src="scripts/floCloudAPI.js"></script>
+    <script id="floDapps" src="scripts/floDapps.js"></script>
+    <script src="scripts/lib_btc.js"></script>
     <script id="ui_utils">
         const { html, render: renderElem } = uhtml;
         const domRefs = {}
@@ -2546,6 +2550,7 @@
     </script>
     <script id="onLoadStartUp">
         let maxCardsPerSection
+        let isShowingFloID = true
 
         function onLoadStartUp() {
 
@@ -2555,9 +2560,26 @@
 
             floDapps.launchStartUp().then(async result => {
                 getRef('user_flo_id').value = myFloID
-                document.querySelectorAll('.user-id').forEach(elem => {
-                    elem.textContent = myFloID
-                })
+                getRef('user_btc_id').value = btc_api.convert.legacy2bech(myFloID)
+                renderElem(getRef('user_popup_button'), html`
+                        <svg class="icon margin-right-0-5" width="64" height="64" viewBox="0 0 64 64" fill="none" xmlns="http://www.w3.org/2000/svg"> <mask id="path-1-outside-1_16_6" maskUnits="userSpaceOnUse" x="3" y="3" width="58" height="58"> <rect fill="white" x="3" y="3" width="58" height="58" /> <path fill-rule="evenodd" clip-rule="evenodd" d="M31.946 43.6019C28.8545 47.1308 28.7789 51.9719 31.9811 55.1957C35.0078 52.2797 35.0105 46.8446 31.946 43.6019ZM31.9487 10.6835C24.6452 19.1291 24.9206 29.1137 31.9433 37.4108C39.0929 28.9436 39.1118 19.0076 31.9487 10.6808V10.6835ZM37.1111 35.051C43.1861 28.841 50.5976 27.4208 59 28.7654C56.2919 34.9754 52.4714 39.9353 45.7214 42.53C47.2118 41.3609 48.5699 40.4051 49.7984 39.3089C51.8504 37.481 53.303 35.267 54.0293 32.6075C54.2588 31.7678 53.9618 31.5302 53.1896 31.406C50.3627 30.9524 47.7086 31.5464 45.1733 32.702C40.9073 34.646 37.4324 37.6403 34.1735 40.8938C34.1168 40.9532 34.0925 41.0396 33.9899 41.2259C40.3754 41.4689 45.2381 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+                        <div>${myFloID}</div>
+                        `)
+                setInterval(() => {
+                    if (!isShowingFloID) {
+                        renderElem(getRef('user_popup_button'), html`
+                        <svg class="icon margin-right-0-5" width="64" height="64" viewBox="0 0 64 64" fill="none" xmlns="http://www.w3.org/2000/svg"> <mask id="path-1-outside-1_16_6" maskUnits="userSpaceOnUse" x="3" y="3" width="58" height="58"> <rect fill="white" x="3" y="3" width="58" height="58" /> <path fill-rule="evenodd" clip-rule="evenodd" d="M31.946 43.6019C28.8545 47.1308 28.7789 51.9719 31.9811 55.1957C35.0078 52.2797 35.0105 46.8446 31.946 43.6019ZM31.9487 10.6835C24.6452 19.1291 24.9206 29.1137 31.9433 37.4108C39.0929 28.9436 39.1118 19.0076 31.9487 10.6808V10.6835ZM37.1111 35.051C43.1861 28.841 50.5976 27.4208 59 28.7654C56.2919 34.9754 52.4714 39.9353 45.7214 42.53C47.2118 41.3609 48.5699 40.4051 49.7984 39.3089C51.8504 37.481 53.303 35.267 54.0293 32.6075C54.2588 31.7678 53.9618 31.5302 53.1896 31.406C50.3627 30.9524 47.7086 31.5464 45.1733 32.702C40.9073 34.646 37.4324 37.6403 34.1735 40.8938C34.1168 40.9532 34.0925 41.0396 33.9899 41.2259C40.3754 41.4689 45.2381 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+                        <div>${myFloID}</div>
+                        `)
+                        isShowingFloID = true
+                    } else {
+                        renderElem(getRef('user_popup_button'), html`
+                        <svg class="icon margin-right-0-5" xmlns="http://www.w3.org/2000/svg" enable-background="new 0 0 24 24" height="24px" viewBox="0 0 24 24" width="24px" fill="#000000"><g><rect fill="none" height="24" width="24"/></g><g><path d="M17.06,11.57C17.65,10.88,18,9.98,18,9c0-1.86-1.27-3.43-3-3.87L15,3h-2v2h-2V3H9v2H6v2h2v10H6v2h3v2h2v-2h2v2h2v-2 c2.21,0,4-1.79,4-4C19,13.55,18.22,12.27,17.06,11.57z M10,7h4c1.1,0,2,0.9,2,2s-0.9,2-2,2h-4V7z M15,17h-5v-4h5c1.1,0,2,0.9,2,2 S16.1,17,15,17z"/></g></svg>
+                        <div >${btc_api.convert.legacy2bech(myFloID)}</div>
+                        `)
+                        isShowingFloID = false
+                    }
+                }, 1000 * 60);
                 floGlobals.isSubAdmin = floGlobals.subAdmins.includes(myFloID)
                 maxCardsPerSection = floGlobals.isSubAdmin ? 3 : 2
                 if (floGlobals.isSubAdmin) {
@@ -2596,12 +2618,6 @@
             }).catch(error => console.error(error))
         }
     </script>
-    <script id="lib" src="scripts/lib.js"></script>
-    <script id="floCrypto" src="scripts/floCrypto.js"></script>
-    <script id="floBlockchainAPI" src="scripts/floBlockchainAPI.js"></script>
-    <script id="compactIDB" src="scripts/compactIDB.js"></script>
-    <script id="floCloudAPI" src="scripts/floCloudAPI.js"></script>
-    <script id="floDapps" src="scripts/floDapps.js"></script>
     <template id="head_template">
         <meta charset="UTF-8">
         <meta name="viewport" content="width=device-width, initial-scale=1.0">
@@ -3458,7 +3474,7 @@
         </sm-popup>
 
         <script id="floGlobals">
-            /* Constants for FLO blockchain operations !!Make sure to add this at begining!! */
+            /* Constants for FLO blockchain operations !!Make sure to add this at beginning!! */
             const floGlobals = {
 
                 //Required for all
diff --git a/scripts/lib_btc.js b/scripts/lib_btc.js
new file mode 100644
index 0000000..4543e51
--- /dev/null
+++ b/scripts/lib_btc.js
@@ -0,0 +1,2883 @@
+(function(GLOBAL) { //lib_btc v1.0.1
+    /* Utility Libraries required
+     * All credits for these codes belong to their respective creators, moderators and owners.
+     * For more info (including license and terms of use), please visit respective source.
+     */
+
+    //sha512.js
+    (function() {
+        /*
+        	A JavaScript implementation of the SHA family of hashes, as defined in FIPS
+        	PUB 180-2 as well as the corresponding HMAC implementation as defined in
+        	FIPS PUB 198a
+           
+        	Copyright Brian Turek 2008-2012
+        	Distributed under the BSD License
+        	See http://caligatio.github.com/jsSHA/ for more information
+           
+        	Several functions taken from Paul Johnson
+           */
+        function n(a) {
+            throw a;
+        }
+        var q = null;
+
+        function s(a, b) {
+            this.a = a;
+            this.b = b
+        }
+
+        function u(a, b) {
+            var d = [],
+                h = (1 << b) - 1,
+                f = a.length * b,
+                g;
+            for (g = 0; g < f; g += b) d[g >>> 5] |= (a.charCodeAt(g / b) & h) << 32 - b - g % 32;
+            return {
+                value: d,
+                binLen: f
+            }
+        }
+
+        function x(a) {
+            var b = [],
+                d = a.length,
+                h, f;
+            0 !== d % 2 && n("String of HEX type must be in byte increments");
+            for (h = 0; h < d; h += 2) f = parseInt(a.substr(h, 2), 16), isNaN(f) && n("String of HEX type contains invalid characters"), b[h >>> 3] |= f << 24 - 4 * (h % 8);
+            return {
+                value: b,
+                binLen: 4 * d
+            }
+        }
+
+        function B(a) {
+            var b = [],
+                d = 0,
+                h, f, g, k, m; - 1 === a.search(/^[a-zA-Z0-9=+\/]+$/) && n("Invalid character in base-64 string");
+            h = a.indexOf("=");
+            a = a.replace(/\=/g, ""); - 1 !== h && h < a.length && n("Invalid '=' found in base-64 string");
+            for (f = 0; f < a.length; f += 4) {
+                m = a.substr(f, 4);
+                for (g = k = 0; g < m.length; g += 1) h = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".indexOf(m[g]), k |= h << 18 - 6 * g;
+                for (g = 0; g < m.length - 1; g += 1) b[d >> 2] |= (k >>> 16 - 8 * g & 255) << 24 - 8 * (d % 4), d += 1
+            }
+            return {
+                value: b,
+                binLen: 8 * d
+            }
+        }
+
+        function E(a, b) {
+            var d = "",
+                h = 4 * a.length,
+                f, g;
+            for (f = 0; f < h; f += 1) g = a[f >>> 2] >>> 8 * (3 - f % 4), d += "0123456789abcdef".charAt(g >>> 4 & 15) + "0123456789abcdef".charAt(g & 15);
+            return b.outputUpper ? d.toUpperCase() : d
+        }
+
+        function F(a, b) {
+            var d = "",
+                h = 4 * a.length,
+                f, g, k;
+            for (f = 0; f < h; f += 3) {
+                k = (a[f >>> 2] >>> 8 * (3 - f % 4) & 255) << 16 | (a[f + 1 >>> 2] >>> 8 * (3 - (f + 1) % 4) & 255) << 8 | a[f + 2 >>> 2] >>> 8 * (3 - (f + 2) % 4) & 255;
+                for (g = 0; 4 > g; g += 1) d = 8 * f + 6 * g <= 32 * a.length ? d + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".charAt(k >>> 6 * (3 - g) & 63) : d + b.b64Pad
+            }
+            return d
+        }
+
+        function G(a) {
+            var b = {
+                outputUpper: !1,
+                b64Pad: "="
+            };
+            try {
+                a.hasOwnProperty("outputUpper") && (b.outputUpper = a.outputUpper), a.hasOwnProperty("b64Pad") && (b.b64Pad = a.b64Pad)
+            } catch (d) {}
+            "boolean" !== typeof b.outputUpper && n("Invalid outputUpper formatting option");
+            "string" !== typeof b.b64Pad && n("Invalid b64Pad formatting option");
+            return b
+        }
+
+        function H(a, b) {
+            var d = q,
+                d = new s(a.a, a.b);
+            return d = 32 >= b ? new s(d.a >>> b | d.b << 32 - b & 4294967295, d.b >>> b | d.a << 32 - b & 4294967295) : new s(d.b >>> b - 32 | d.a << 64 - b & 4294967295, d.a >>> b - 32 | d.b << 64 - b & 4294967295)
+        }
+
+        function I(a, b) {
+            var d = q;
+            return d = 32 >= b ? new s(a.a >>> b, a.b >>> b | a.a << 32 - b & 4294967295) : new s(0, a.a >>> b - 32)
+        }
+
+        function J(a, b, d) {
+            return new s(a.a & b.a ^ ~a.a & d.a, a.b & b.b ^ ~a.b & d.b)
+        }
+
+        function U(a, b, d) {
+            return new s(a.a & b.a ^ a.a & d.a ^ b.a & d.a, a.b & b.b ^ a.b & d.b ^ b.b & d.b)
+        }
+
+        function V(a) {
+            var b = H(a, 28),
+                d = H(a, 34);
+            a = H(a, 39);
+            return new s(b.a ^ d.a ^ a.a, b.b ^ d.b ^ a.b)
+        }
+
+        function W(a) {
+            var b = H(a, 14),
+                d = H(a, 18);
+            a = H(a, 41);
+            return new s(b.a ^ d.a ^ a.a, b.b ^ d.b ^ a.b)
+        }
+
+        function X(a) {
+            var b = H(a, 1),
+                d = H(a, 8);
+            a = I(a, 7);
+            return new s(b.a ^ d.a ^ a.a, b.b ^ d.b ^ a.b)
+        }
+
+        function Y(a) {
+            var b = H(a, 19),
+                d = H(a, 61);
+            a = I(a, 6);
+            return new s(b.a ^ d.a ^ a.a, b.b ^ d.b ^ a.b)
+        }
+
+        function Z(a, b) {
+            var d, h, f;
+            d = (a.b & 65535) + (b.b & 65535);
+            h = (a.b >>> 16) + (b.b >>> 16) + (d >>> 16);
+            f = (h & 65535) << 16 | d & 65535;
+            d = (a.a & 65535) + (b.a & 65535) + (h >>> 16);
+            h = (a.a >>> 16) + (b.a >>> 16) + (d >>> 16);
+            return new s((h & 65535) << 16 | d & 65535, f)
+        }
+
+        function aa(a, b, d, h) {
+            var f, g, k;
+            f = (a.b & 65535) + (b.b & 65535) + (d.b & 65535) + (h.b & 65535);
+            g = (a.b >>> 16) + (b.b >>> 16) + (d.b >>> 16) + (h.b >>> 16) + (f >>> 16);
+            k = (g & 65535) << 16 | f & 65535;
+            f = (a.a & 65535) + (b.a & 65535) + (d.a & 65535) + (h.a & 65535) + (g >>> 16);
+            g = (a.a >>> 16) + (b.a >>> 16) + (d.a >>> 16) + (h.a >>> 16) + (f >>> 16);
+            return new s((g & 65535) << 16 | f & 65535, k)
+        }
+
+        function ba(a, b, d, h, f) {
+            var g, k, m;
+            g = (a.b & 65535) + (b.b & 65535) + (d.b & 65535) + (h.b & 65535) + (f.b & 65535);
+            k = (a.b >>> 16) + (b.b >>> 16) + (d.b >>> 16) + (h.b >>> 16) + (f.b >>> 16) + (g >>> 16);
+            m = (k & 65535) << 16 | g & 65535;
+            g = (a.a & 65535) + (b.a & 65535) + (d.a & 65535) + (h.a & 65535) + (f.a & 65535) + (k >>> 16);
+            k = (a.a >>> 16) + (b.a >>> 16) + (d.a >>> 16) + (h.a >>> 16) + (f.a >>> 16) + (g >>> 16);
+            return new s((k & 65535) << 16 | g & 65535, m)
+        }
+
+        function $(a, b, d) {
+            var h, f, g, k, m, j, A, C, K, e, L, v, l, M, t, p, y, z, r, N, O, P, Q, R, c, S, w = [],
+                T, D;
+            "SHA-384" === d || "SHA-512" === d ? (L = 80, h = (b + 128 >>> 10 << 5) + 31, M = 32, t = 2, c = s, p = Z, y = aa, z = ba, r = X, N = Y, O = V, P = W, R = U, Q = J, S = [new c(1116352408, 3609767458), new c(1899447441, 602891725), new c(3049323471, 3964484399), new c(3921009573, 2173295548), new c(961987163, 4081628472), new c(1508970993, 3053834265), new c(2453635748, 2937671579), new c(2870763221, 3664609560), new c(3624381080, 2734883394), new c(310598401, 1164996542), new c(607225278, 1323610764),
+                new c(1426881987, 3590304994), new c(1925078388, 4068182383), new c(2162078206, 991336113), new c(2614888103, 633803317), new c(3248222580, 3479774868), new c(3835390401, 2666613458), new c(4022224774, 944711139), new c(264347078, 2341262773), new c(604807628, 2007800933), new c(770255983, 1495990901), new c(1249150122, 1856431235), new c(1555081692, 3175218132), new c(1996064986, 2198950837), new c(2554220882, 3999719339), new c(2821834349, 766784016), new c(2952996808, 2566594879), new c(3210313671, 3203337956), new c(3336571891,
+                    1034457026), new c(3584528711, 2466948901), new c(113926993, 3758326383), new c(338241895, 168717936), new c(666307205, 1188179964), new c(773529912, 1546045734), new c(1294757372, 1522805485), new c(1396182291, 2643833823), new c(1695183700, 2343527390), new c(1986661051, 1014477480), new c(2177026350, 1206759142), new c(2456956037, 344077627), new c(2730485921, 1290863460), new c(2820302411, 3158454273), new c(3259730800, 3505952657), new c(3345764771, 106217008), new c(3516065817, 3606008344), new c(3600352804, 1432725776), new c(4094571909,
+                    1467031594), new c(275423344, 851169720), new c(430227734, 3100823752), new c(506948616, 1363258195), new c(659060556, 3750685593), new c(883997877, 3785050280), new c(958139571, 3318307427), new c(1322822218, 3812723403), new c(1537002063, 2003034995), new c(1747873779, 3602036899), new c(1955562222, 1575990012), new c(2024104815, 1125592928), new c(2227730452, 2716904306), new c(2361852424, 442776044), new c(2428436474, 593698344), new c(2756734187, 3733110249), new c(3204031479, 2999351573), new c(3329325298, 3815920427), new c(3391569614,
+                    3928383900), new c(3515267271, 566280711), new c(3940187606, 3454069534), new c(4118630271, 4000239992), new c(116418474, 1914138554), new c(174292421, 2731055270), new c(289380356, 3203993006), new c(460393269, 320620315), new c(685471733, 587496836), new c(852142971, 1086792851), new c(1017036298, 365543100), new c(1126000580, 2618297676), new c(1288033470, 3409855158), new c(1501505948, 4234509866), new c(1607167915, 987167468), new c(1816402316, 1246189591)
+            ], e = "SHA-384" === d ? [new c(3418070365, 3238371032), new c(1654270250, 914150663),
+                new c(2438529370, 812702999), new c(355462360, 4144912697), new c(1731405415, 4290775857), new c(41048885895, 1750603025), new c(3675008525, 1694076839), new c(1203062813, 3204075428)
+            ] : [new c(1779033703, 4089235720), new c(3144134277, 2227873595), new c(1013904242, 4271175723), new c(2773480762, 1595750129), new c(1359893119, 2917565137), new c(2600822924, 725511199), new c(528734635, 4215389547), new c(1541459225, 327033209)]) : n("Unexpected error in SHA-2 implementation");
+            a[b >>> 5] |= 128 << 24 - b % 32;
+            a[h] = b;
+            T = a.length;
+            for (v = 0; v <
+                T; v += M) {
+                b = e[0];
+                h = e[1];
+                f = e[2];
+                g = e[3];
+                k = e[4];
+                m = e[5];
+                j = e[6];
+                A = e[7];
+                for (l = 0; l < L; l += 1) w[l] = 16 > l ? new c(a[l * t + v], a[l * t + v + 1]) : y(N(w[l - 2]), w[l - 7], r(w[l - 15]), w[l - 16]), C = z(A, P(k), Q(k, m, j), S[l], w[l]), K = p(O(b), R(b, h, f)), A = j, j = m, m = k, k = p(g, C), g = f, f = h, h = b, b = p(C, K);
+                e[0] = p(b, e[0]);
+                e[1] = p(h, e[1]);
+                e[2] = p(f, e[2]);
+                e[3] = p(g, e[3]);
+                e[4] = p(k, e[4]);
+                e[5] = p(m, e[5]);
+                e[6] = p(j, e[6]);
+                e[7] = p(A, e[7])
+            }
+            "SHA-384" === d ? D = [e[0].a, e[0].b, e[1].a, e[1].b, e[2].a, e[2].b, e[3].a, e[3].b, e[4].a, e[4].b, e[5].a, e[5].b] : "SHA-512" === d ? D = [e[0].a, e[0].b,
+                e[1].a, e[1].b, e[2].a, e[2].b, e[3].a, e[3].b, e[4].a, e[4].b, e[5].a, e[5].b, e[6].a, e[6].b, e[7].a, e[7].b
+            ] : n("Unexpected error in SHA-2 implementation");
+            return D
+        }
+        GLOBAL.jsSHA = function(a, b, d) {
+            var h = q,
+                f = q,
+                g = 0,
+                k = [0],
+                m = 0,
+                j = q,
+                m = "undefined" !== typeof d ? d : 8;
+            8 === m || 16 === m || n("charSize must be 8 or 16");
+            "HEX" === b ? (0 !== a.length % 2 && n("srcString of HEX type must be in byte increments"), j = x(a), g = j.binLen, k = j.value) : "ASCII" === b || "TEXT" === b ? (j = u(a, m), g = j.binLen, k = j.value) : "B64" === b ? (j = B(a), g = j.binLen, k = j.value) : n("inputFormat must be HEX, TEXT, ASCII, or B64");
+            this.getHash = function(a, b, d) {
+                var e = q,
+                    m = k.slice(),
+                    j = "";
+                switch (b) {
+                    case "HEX":
+                        e = E;
+                        break;
+                    case "B64":
+                        e = F;
+                        break;
+                    default:
+                        n("format must be HEX or B64")
+                }
+                "SHA-384" ===
+                a ? (q === h && (h = $(m, g, a)), j = e(h, G(d))) : "SHA-512" === a ? (q === f && (f = $(m, g, a)), j = e(f, G(d))) : n("Chosen SHA variant is not supported");
+                return j
+            };
+            this.getHMAC = function(a, b, d, e, f) {
+                var h, l, j, t, p, y = [],
+                    z = [],
+                    r = q;
+                switch (e) {
+                    case "HEX":
+                        h = E;
+                        break;
+                    case "B64":
+                        h = F;
+                        break;
+                    default:
+                        n("outputFormat must be HEX or B64")
+                }
+                "SHA-384" === d ? (j = 128, p = 384) : "SHA-512" === d ? (j = 128, p = 512) : n("Chosen SHA variant is not supported");
+                "HEX" === b ? (r = x(a), t = r.binLen, l = r.value) : "ASCII" === b || "TEXT" === b ? (r = u(a, m), t = r.binLen, l = r.value) : "B64" === b ? (r = B(a),
+                    t = r.binLen, l = r.value) : n("inputFormat must be HEX, TEXT, ASCII, or B64");
+                a = 8 * j;
+                b = j / 4 - 1;
+                j < t / 8 ? (l = $(l, t, d), l[b] &= 4294967040) : j > t / 8 && (l[b] &= 4294967040);
+                for (j = 0; j <= b; j += 1) y[j] = l[j] ^ 909522486, z[j] = l[j] ^ 1549556828;
+                d = $(z.concat($(y.concat(k), a + g, d)), a + p, d);
+                return h(d, G(f))
+            }
+        };
+    })();
+
+    //coin.js
+    (function() {
+        /*
+ 			Coinjs 0.01 beta by OutCast3k{at}gmail.com
+ 			A bitcoin framework.
+ 			http://github.com/OutCast3k/coinjs or http://coinb.in/coinjs
+		*/
+        var coinjs = GLOBAL.coinjs = function() {};
+
+        /* public vars */
+        coinjs.pub = 0x00;
+        coinjs.priv = 0x80;
+        coinjs.multisig = 0x05;
+        coinjs.hdkey = {
+            'prv': 0x0488ade4,
+            'pub': 0x0488b21e
+        };
+        coinjs.bech32 = {
+            'charset': 'qpzry9x8gf2tvdw0s3jn54khce6mua7l',
+            'version': 0,
+            'hrp': 'bc'
+        };
+
+        coinjs.compressed = false;
+
+        /* other vars */
+        coinjs.developer = '33tht1bKDgZVxb39MnZsWa8oxHXHvUYE4G'; //bitcoin
+
+        /* bit(coinb.in) api vars */
+        coinjs.hostname = ((document.location.hostname.split(".")[(document.location.hostname.split(".")).length - 1]) == 'onion') ? 'coinbin3ravkwb24f7rmxx6w3snkjw45jhs5lxbh3yfeg3vpt6janwqd.onion' : 'coinb.in';
+        coinjs.host = ('https:' == document.location.protocol ? 'https://' : 'http://') + coinjs.hostname + '/api/';
+        coinjs.uid = '1';
+        coinjs.key = '12345678901234567890123456789012';
+
+        /* start of address functions */
+
+        /* generate a private and public keypair, with address and WIF address */
+        coinjs.newKeys = function(input) {
+            var privkey = (input) ? Crypto.SHA256(input) : this.newPrivkey();
+            var pubkey = this.newPubkey(privkey);
+            return {
+                'privkey': privkey,
+                'pubkey': pubkey,
+                'address': this.pubkey2address(pubkey),
+                'wif': this.privkey2wif(privkey),
+                'compressed': this.compressed
+            };
+        }
+
+        /* generate a new random private key */
+        coinjs.newPrivkey = function() {
+            var x = GLOBAL.location;
+            x += (GLOBAL.screen.height * GLOBAL.screen.width * GLOBAL.screen.colorDepth);
+            x += coinjs.random(64);
+            x += (GLOBAL.screen.availHeight * GLOBAL.screen.availWidth * GLOBAL.screen.pixelDepth);
+            x += navigator.language;
+            x += GLOBAL.history.length;
+            x += coinjs.random(64);
+            x += navigator.userAgent;
+            x += 'coinb.in';
+            x += (Crypto.util.randomBytes(64)).join("");
+            x += x.length;
+            var dateObj = new Date();
+            x += dateObj.getTimezoneOffset();
+            x += coinjs.random(64);
+            x += (document.getElementById("entropybucket")) ? document.getElementById("entropybucket").innerHTML : '';
+            x += x + '' + x;
+            var r = x;
+            for (i = 0; i < (x).length / 25; i++) {
+                r = Crypto.SHA256(r.concat(x));
+            }
+            var checkrBigInt = new BigInteger(r);
+            var orderBigInt = new BigInteger("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141");
+            while (checkrBigInt.compareTo(orderBigInt) >= 0 || checkrBigInt.equals(BigInteger.ZERO) || checkrBigInt.equals(BigInteger.ONE)) {
+                r = Crypto.SHA256(r.concat(x));
+                checkrBigInt = new BigInteger(r);
+            }
+            return r;
+        }
+
+        /* generate a public key from a private key */
+        coinjs.newPubkey = function(hash) {
+            var privateKeyBigInt = BigInteger.fromByteArrayUnsigned(Crypto.util.hexToBytes(hash));
+            var curve = EllipticCurve.getSECCurveByName("secp256k1");
+
+            var curvePt = curve.getG().multiply(privateKeyBigInt);
+            var x = curvePt.getX().toBigInteger();
+            var y = curvePt.getY().toBigInteger();
+
+            var publicKeyBytes = EllipticCurve.integerToBytes(x, 32);
+            publicKeyBytes = publicKeyBytes.concat(EllipticCurve.integerToBytes(y, 32));
+            publicKeyBytes.unshift(0x04);
+
+            if (coinjs.compressed == true) {
+                var publicKeyBytesCompressed = EllipticCurve.integerToBytes(x, 32)
+                if (y.isEven()) {
+                    publicKeyBytesCompressed.unshift(0x02)
+                } else {
+                    publicKeyBytesCompressed.unshift(0x03)
+                }
+                return Crypto.util.bytesToHex(publicKeyBytesCompressed);
+            } else {
+                return Crypto.util.bytesToHex(publicKeyBytes);
+            }
+        }
+
+        /* provide a public key and return address */
+        coinjs.pubkey2address = function(h, byte) {
+            var r = ripemd160(Crypto.SHA256(Crypto.util.hexToBytes(h), {
+                asBytes: true
+            }));
+            r.unshift(byte || coinjs.pub);
+            var hash = Crypto.SHA256(Crypto.SHA256(r, {
+                asBytes: true
+            }), {
+                asBytes: true
+            });
+            var checksum = hash.slice(0, 4);
+            return coinjs.base58encode(r.concat(checksum));
+        }
+
+        /* provide a scripthash and return address */
+        coinjs.scripthash2address = function(h) {
+            var x = Crypto.util.hexToBytes(h);
+            x.unshift(coinjs.pub);
+            var r = x;
+            r = Crypto.SHA256(Crypto.SHA256(r, {
+                asBytes: true
+            }), {
+                asBytes: true
+            });
+            var checksum = r.slice(0, 4);
+            return coinjs.base58encode(x.concat(checksum));
+        }
+
+        /* new multisig address, provide the pubkeys AND required signatures to release the funds */
+        coinjs.pubkeys2MultisigAddress = function(pubkeys, required) {
+            var s = coinjs.script();
+            s.writeOp(81 + (required * 1) - 1); //OP_1
+            for (var i = 0; i < pubkeys.length; ++i) {
+                s.writeBytes(Crypto.util.hexToBytes(pubkeys[i]));
+            }
+            s.writeOp(81 + pubkeys.length - 1); //OP_1 
+            s.writeOp(174); //OP_CHECKMULTISIG
+            var x = ripemd160(Crypto.SHA256(s.buffer, {
+                asBytes: true
+            }), {
+                asBytes: true
+            });
+            x.unshift(coinjs.multisig);
+            var r = x;
+            r = Crypto.SHA256(Crypto.SHA256(r, {
+                asBytes: true
+            }), {
+                asBytes: true
+            });
+            var checksum = r.slice(0, 4);
+            var redeemScript = Crypto.util.bytesToHex(s.buffer);
+            var address = coinjs.base58encode(x.concat(checksum));
+
+            if (s.buffer.length > 520) { // too large
+                address = 'invalid';
+                redeemScript = 'invalid';
+            }
+
+            return {
+                'address': address,
+                'redeemScript': redeemScript,
+                'size': s.buffer.length
+            };
+        }
+
+        /* new time locked address, provide the pubkey and time necessary to unlock the funds.
+           when time is greater than 500000000, it should be a unix timestamp (seconds since epoch),
+           otherwise it should be the block height required before this transaction can be released. 
+
+           may throw a string on failure!
+        */
+        coinjs.simpleHodlAddress = function(pubkey, checklocktimeverify) {
+
+            if (checklocktimeverify < 0) {
+                throw "Parameter for OP_CHECKLOCKTIMEVERIFY is negative.";
+            }
+
+            var s = coinjs.script();
+            if (checklocktimeverify <= 16 && checklocktimeverify >= 1) {
+                s.writeOp(0x50 + checklocktimeverify); //OP_1 to OP_16 for minimal encoding
+            } else {
+                s.writeBytes(coinjs.numToScriptNumBytes(checklocktimeverify));
+            }
+            s.writeOp(177); //OP_CHECKLOCKTIMEVERIFY
+            s.writeOp(117); //OP_DROP
+            s.writeBytes(Crypto.util.hexToBytes(pubkey));
+            s.writeOp(172); //OP_CHECKSIG
+
+            var x = ripemd160(Crypto.SHA256(s.buffer, {
+                asBytes: true
+            }), {
+                asBytes: true
+            });
+            x.unshift(coinjs.multisig);
+            var r = x;
+            r = Crypto.SHA256(Crypto.SHA256(r, {
+                asBytes: true
+            }), {
+                asBytes: true
+            });
+            var checksum = r.slice(0, 4);
+            var redeemScript = Crypto.util.bytesToHex(s.buffer);
+            var address = coinjs.base58encode(x.concat(checksum));
+
+            return {
+                'address': address,
+                'redeemScript': redeemScript
+            };
+        }
+
+        /* create a new segwit address */
+        coinjs.segwitAddress = function(pubkey) {
+            var keyhash = [0x00, 0x14].concat(ripemd160(Crypto.SHA256(Crypto.util.hexToBytes(pubkey), {
+                asBytes: true
+            }), {
+                asBytes: true
+            }));
+            var x = ripemd160(Crypto.SHA256(keyhash, {
+                asBytes: true
+            }), {
+                asBytes: true
+            });
+            x.unshift(coinjs.multisig);
+            var r = x;
+            r = Crypto.SHA256(Crypto.SHA256(r, {
+                asBytes: true
+            }), {
+                asBytes: true
+            });
+            var checksum = r.slice(0, 4);
+            var address = coinjs.base58encode(x.concat(checksum));
+
+            return {
+                'address': address,
+                'type': 'segwit',
+                'redeemscript': Crypto.util.bytesToHex(keyhash)
+            };
+        }
+
+        /* create a new segwit bech32 encoded address */
+        coinjs.bech32Address = function(pubkey) {
+            var program = ripemd160(Crypto.SHA256(Crypto.util.hexToBytes(pubkey), {
+                asBytes: true
+            }), {
+                asBytes: true
+            });
+            var address = coinjs.bech32_encode(coinjs.bech32.hrp, [coinjs.bech32.version].concat(coinjs.bech32_convert(program, 8, 5, true)));
+            return {
+                'address': address,
+                'type': 'bech32',
+                'redeemscript': Crypto.util.bytesToHex(program)
+            };
+        }
+
+        /* extract the redeemscript from a bech32 address */
+        coinjs.bech32redeemscript = function(address) {
+            var r = false;
+            var decode = coinjs.bech32_decode(address);
+            if (decode) {
+                decode.data.shift();
+                return Crypto.util.bytesToHex(coinjs.bech32_convert(decode.data, 5, 8, false));
+            }
+            return r;
+        }
+
+        /* provide a privkey and return an WIF  */
+        coinjs.privkey2wif = function(h) {
+            var r = Crypto.util.hexToBytes(h);
+
+            if (coinjs.compressed == true) {
+                r.push(0x01);
+            }
+
+            r.unshift(coinjs.priv);
+            var hash = Crypto.SHA256(Crypto.SHA256(r, {
+                asBytes: true
+            }), {
+                asBytes: true
+            });
+            var checksum = hash.slice(0, 4);
+
+            return coinjs.base58encode(r.concat(checksum));
+        }
+
+        /* convert a wif key back to a private key */
+        coinjs.wif2privkey = function(wif) {
+            var compressed = false;
+            var decode = coinjs.base58decode(wif);
+            var key = decode.slice(0, decode.length - 4);
+            key = key.slice(1, key.length);
+            if (key.length >= 33 && key[key.length - 1] == 0x01) {
+                key = key.slice(0, key.length - 1);
+                compressed = true;
+            }
+            return {
+                'privkey': Crypto.util.bytesToHex(key),
+                'compressed': compressed
+            };
+        }
+
+        /* convert a wif to a pubkey */
+        coinjs.wif2pubkey = function(wif) {
+            var compressed = coinjs.compressed;
+            var r = coinjs.wif2privkey(wif);
+            coinjs.compressed = r['compressed'];
+            var pubkey = coinjs.newPubkey(r['privkey']);
+            coinjs.compressed = compressed;
+            return {
+                'pubkey': pubkey,
+                'compressed': r['compressed']
+            };
+        }
+
+        /* convert a wif to a address */
+        coinjs.wif2address = function(wif) {
+            var r = coinjs.wif2pubkey(wif);
+            return {
+                'address': coinjs.pubkey2address(r['pubkey']),
+                'compressed': r['compressed']
+            };
+        }
+
+        /* decode or validate an address and return the hash */
+        coinjs.addressDecode = function(addr) {
+            try {
+                var bytes = coinjs.base58decode(addr);
+                var front = bytes.slice(0, bytes.length - 4);
+                var back = bytes.slice(bytes.length - 4);
+                var checksum = Crypto.SHA256(Crypto.SHA256(front, {
+                    asBytes: true
+                }), {
+                    asBytes: true
+                }).slice(0, 4);
+                if (checksum + "" == back + "") {
+
+                    var o = {};
+                    o.bytes = front.slice(1);
+                    o.version = front[0];
+
+                    if (o.version == coinjs.pub) { // standard address
+                        o.type = 'standard';
+
+                    } else if (o.version == coinjs.multisig) { // multisig address
+                        o.type = 'multisig';
+
+                    } else if (o.version == coinjs.priv) { // wifkey
+                        o.type = 'wifkey';
+
+                    } else if (o.version == 42) { // stealth address
+                        o.type = 'stealth';
+
+                        o.option = front[1];
+                        if (o.option != 0) {
+                            alert("Stealth Address option other than 0 is currently not supported!");
+                            return false;
+                        };
+
+                        o.scankey = Crypto.util.bytesToHex(front.slice(2, 35));
+                        o.n = front[35];
+
+                        if (o.n > 1) {
+                            alert("Stealth Multisig is currently not supported!");
+                            return false;
+                        };
+
+                        o.spendkey = Crypto.util.bytesToHex(front.slice(36, 69));
+                        o.m = front[69];
+                        o.prefixlen = front[70];
+
+                        if (o.prefixlen > 0) {
+                            alert("Stealth Address Prefixes are currently not supported!");
+                            return false;
+                        };
+                        o.prefix = front.slice(71);
+
+                    } else { // everything else
+                        o.type = 'other'; // address is still valid but unknown version
+                    }
+
+                    return o;
+                } else {
+                    throw "Invalid checksum";
+                }
+            } catch (e) {
+                bech32rs = coinjs.bech32redeemscript(addr);
+                if (bech32rs) {
+                    return {
+                        'type': 'bech32',
+                        'redeemscript': bech32rs
+                    };
+                } else {
+                    return false;
+                }
+            }
+        }
+
+        /* retreive the balance from a given address */
+        coinjs.addressBalance = function(address, callback) {
+            coinjs.ajax(coinjs.host + '?uid=' + coinjs.uid + '&key=' + coinjs.key + '&setmodule=addresses&request=bal&address=' + address + '&r=' + Math.random(), callback, "GET");
+        }
+
+        /* decompress an compressed public key */
+        coinjs.pubkeydecompress = function(pubkey) {
+            if ((typeof(pubkey) == 'string') && pubkey.match(/^[a-f0-9]+$/i)) {
+                var curve = EllipticCurve.getSECCurveByName("secp256k1");
+                try {
+                    var pt = curve.curve.decodePointHex(pubkey);
+                    var x = pt.getX().toBigInteger();
+                    var y = pt.getY().toBigInteger();
+
+                    var publicKeyBytes = EllipticCurve.integerToBytes(x, 32);
+                    publicKeyBytes = publicKeyBytes.concat(EllipticCurve.integerToBytes(y, 32));
+                    publicKeyBytes.unshift(0x04);
+                    return Crypto.util.bytesToHex(publicKeyBytes);
+                } catch (e) {
+                    // console.log(e);
+                    return false;
+                }
+            }
+            return false;
+        }
+
+        coinjs.bech32_polymod = function(values) {
+            var chk = 1;
+            var BECH32_GENERATOR = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3];
+            for (var p = 0; p < values.length; ++p) {
+                var top = chk >> 25;
+                chk = (chk & 0x1ffffff) << 5 ^ values[p];
+                for (var i = 0; i < 5; ++i) {
+                    if ((top >> i) & 1) {
+                        chk ^= BECH32_GENERATOR[i];
+                    }
+                }
+            }
+            return chk;
+        }
+
+        coinjs.bech32_hrpExpand = function(hrp) {
+            var ret = [];
+            var p;
+            for (p = 0; p < hrp.length; ++p) {
+                ret.push(hrp.charCodeAt(p) >> 5);
+            }
+            ret.push(0);
+            for (p = 0; p < hrp.length; ++p) {
+                ret.push(hrp.charCodeAt(p) & 31);
+            }
+            return ret;
+        }
+
+        coinjs.bech32_verifyChecksum = function(hrp, data) {
+            return coinjs.bech32_polymod(coinjs.bech32_hrpExpand(hrp).concat(data)) === 1;
+        }
+
+        coinjs.bech32_createChecksum = function(hrp, data) {
+            var values = coinjs.bech32_hrpExpand(hrp).concat(data).concat([0, 0, 0, 0, 0, 0]);
+            var mod = coinjs.bech32_polymod(values) ^ 1;
+            var ret = [];
+            for (var p = 0; p < 6; ++p) {
+                ret.push((mod >> 5 * (5 - p)) & 31);
+            }
+            return ret;
+        }
+
+        coinjs.bech32_encode = function(hrp, data) {
+            var combined = data.concat(coinjs.bech32_createChecksum(hrp, data));
+            var ret = hrp + '1';
+            for (var p = 0; p < combined.length; ++p) {
+                ret += coinjs.bech32.charset.charAt(combined[p]);
+            }
+            return ret;
+        }
+
+        coinjs.bech32_decode = function(bechString) {
+            var p;
+            var has_lower = false;
+            var has_upper = false;
+            for (p = 0; p < bechString.length; ++p) {
+                if (bechString.charCodeAt(p) < 33 || bechString.charCodeAt(p) > 126) {
+                    return null;
+                }
+                if (bechString.charCodeAt(p) >= 97 && bechString.charCodeAt(p) <= 122) {
+                    has_lower = true;
+                }
+                if (bechString.charCodeAt(p) >= 65 && bechString.charCodeAt(p) <= 90) {
+                    has_upper = true;
+                }
+            }
+            if (has_lower && has_upper) {
+                return null;
+            }
+            bechString = bechString.toLowerCase();
+            var pos = bechString.lastIndexOf('1');
+            if (pos < 1 || pos + 7 > bechString.length || bechString.length > 90) {
+                return null;
+            }
+            var hrp = bechString.substring(0, pos);
+            var data = [];
+            for (p = pos + 1; p < bechString.length; ++p) {
+                var d = coinjs.bech32.charset.indexOf(bechString.charAt(p));
+                if (d === -1) {
+                    return null;
+                }
+                data.push(d);
+            }
+            if (!coinjs.bech32_verifyChecksum(hrp, data)) {
+                return null;
+            }
+            return {
+                hrp: hrp,
+                data: data.slice(0, data.length - 6)
+            };
+        }
+
+        coinjs.bech32_convert = function(data, inBits, outBits, pad) {
+            var value = 0;
+            var bits = 0;
+            var maxV = (1 << outBits) - 1;
+
+            var result = [];
+            for (var i = 0; i < data.length; ++i) {
+                value = (value << inBits) | data[i];
+                bits += inBits;
+
+                while (bits >= outBits) {
+                    bits -= outBits;
+                    result.push((value >> bits) & maxV);
+                }
+            }
+
+            if (pad) {
+                if (bits > 0) {
+                    result.push((value << (outBits - bits)) & maxV);
+                }
+            } else {
+                if (bits >= inBits) throw new Error('Excess padding');
+                if ((value << (outBits - bits)) & maxV) throw new Error('Non-zero padding');
+            }
+
+            return result;
+        }
+
+        coinjs.testdeterministicK = function() {
+            // https://github.com/bitpay/bitcore/blob/9a5193d8e94b0bd5b8e7f00038e7c0b935405a03/test/crypto/ecdsa.js
+            // Line 21 and 22 specify digest hash and privkey for the first 2 test vectors.
+            // Line 96-117 tells expected result.
+
+            var tx = coinjs.transaction();
+
+            var test_vectors = [{
+                    'message': 'test data',
+                    'privkey': 'fee0a1f7afebf9d2a5a80c0c98a31c709681cce195cbcd06342b517970c0be1e',
+                    'k_bad00': 'fcce1de7a9bcd6b2d3defade6afa1913fb9229e3b7ddf4749b55c4848b2a196e',
+                    'k_bad01': '727fbcb59eb48b1d7d46f95a04991fc512eb9dbf9105628e3aec87428df28fd8',
+                    'k_bad15': '398f0e2c9f79728f7b3d84d447ac3a86d8b2083c8f234a0ffa9c4043d68bd258'
+                },
+                {
+                    'message': 'Everything should be made as simple as possible, but not simpler.',
+                    'privkey': '0000000000000000000000000000000000000000000000000000000000000001',
+                    'k_bad00': 'ec633bd56a5774a0940cb97e27a9e4e51dc94af737596a0c5cbb3d30332d92a5',
+                    'k_bad01': 'df55b6d1b5c48184622b0ead41a0e02bfa5ac3ebdb4c34701454e80aabf36f56',
+                    'k_bad15': 'def007a9a3c2f7c769c75da9d47f2af84075af95cadd1407393dc1e26086ef87'
+                },
+                {
+                    'message': 'Satoshi Nakamoto',
+                    'privkey': '0000000000000000000000000000000000000000000000000000000000000002',
+                    'k_bad00': 'd3edc1b8224e953f6ee05c8bbf7ae228f461030e47caf97cde91430b4607405e',
+                    'k_bad01': 'f86d8e43c09a6a83953f0ab6d0af59fb7446b4660119902e9967067596b58374',
+                    'k_bad15': '241d1f57d6cfd2f73b1ada7907b199951f95ef5ad362b13aed84009656e0254a'
+                },
+                {
+                    'message': 'Diffie Hellman',
+                    'privkey': '7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f',
+                    'k_bad00': 'c378a41cb17dce12340788dd3503635f54f894c306d52f6e9bc4b8f18d27afcc',
+                    'k_bad01': '90756c96fef41152ac9abe08819c4e95f16da2af472880192c69a2b7bac29114',
+                    'k_bad15': '7b3f53300ab0ccd0f698f4d67db87c44cf3e9e513d9df61137256652b2e94e7c'
+                },
+                {
+                    'message': 'Japan',
+                    'privkey': '8080808080808080808080808080808080808080808080808080808080808080',
+                    'k_bad00': 'f471e61b51d2d8db78f3dae19d973616f57cdc54caaa81c269394b8c34edcf59',
+                    'k_bad01': '6819d85b9730acc876fdf59e162bf309e9f63dd35550edf20869d23c2f3e6d17',
+                    'k_bad15': 'd8e8bae3ee330a198d1f5e00ad7c5f9ed7c24c357c0a004322abca5d9cd17847'
+                },
+                {
+                    'message': 'Bitcoin',
+                    'privkey': 'fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364140',
+                    'k_bad00': '36c848ffb2cbecc5422c33a994955b807665317c1ce2a0f59c689321aaa631cc',
+                    'k_bad01': '4ed8de1ec952a4f5b3bd79d1ff96446bcd45cabb00fc6ca127183e14671bcb85',
+                    'k_bad15': '56b6f47babc1662c011d3b1f93aa51a6e9b5f6512e9f2e16821a238d450a31f8'
+                },
+                {
+                    'message': 'i2FLPP8WEus5WPjpoHwheXOMSobUJVaZM1JPMQZq',
+                    'privkey': 'fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364140',
+                    'k_bad00': '6e9b434fcc6bbb081a0463c094356b47d62d7efae7da9c518ed7bac23f4e2ed6',
+                    'k_bad01': 'ae5323ae338d6117ce8520a43b92eacd2ea1312ae514d53d8e34010154c593bb',
+                    'k_bad15': '3eaa1b61d1b8ab2f1ca71219c399f2b8b3defa624719f1e96fe3957628c2c4ea'
+                },
+                {
+                    'message': 'lEE55EJNP7aLrMtjkeJKKux4Yg0E8E1SAJnWTCEh',
+                    'privkey': '3881e5286abc580bb6139fe8e83d7c8271c6fe5e5c2d640c1f0ed0e1ee37edc9',
+                    'k_bad00': '5b606665a16da29cc1c5411d744ab554640479dd8abd3c04ff23bd6b302e7034',
+                    'k_bad01': 'f8b25263152c042807c992eacd2ac2cc5790d1e9957c394f77ea368e3d9923bd',
+                    'k_bad15': 'ea624578f7e7964ac1d84adb5b5087dd14f0ee78b49072aa19051cc15dab6f33'
+                },
+                {
+                    'message': '2SaVPvhxkAPrayIVKcsoQO5DKA8Uv5X/esZFlf+y',
+                    'privkey': '7259dff07922de7f9c4c5720d68c9745e230b32508c497dd24cb95ef18856631',
+                    'k_bad00': '3ab6c19ab5d3aea6aa0c6da37516b1d6e28e3985019b3adb388714e8f536686b',
+                    'k_bad01': '19af21b05004b0ce9cdca82458a371a9d2cf0dc35a813108c557b551c08eb52e',
+                    'k_bad15': '117a32665fca1b7137a91c4739ac5719fec0cf2e146f40f8e7c21b45a07ebc6a'
+                },
+                {
+                    'message': '00A0OwO2THi7j5Z/jp0FmN6nn7N/DQd6eBnCS+/b',
+                    'privkey': '0d6ea45d62b334777d6995052965c795a4f8506044b4fd7dc59c15656a28f7aa',
+                    'k_bad00': '79487de0c8799158294d94c0eb92ee4b567e4dc7ca18addc86e49d31ce1d2db6',
+                    'k_bad01': '9561d2401164a48a8f600882753b3105ebdd35e2358f4f808c4f549c91490009',
+                    'k_bad15': 'b0d273634129ff4dbdf0df317d4062a1dbc58818f88878ffdb4ec511c77976c0'
+                }
+            ];
+
+            var result_txt = '\n----------------------\nResults\n----------------------\n\n';
+
+            for (i = 0; i < test_vectors.length; i++) {
+                var hash = Crypto.SHA256(test_vectors[i]['message'].split('').map(function(c) {
+                    return c.charCodeAt(0);
+                }), {
+                    asBytes: true
+                });
+                var wif = coinjs.privkey2wif(test_vectors[i]['privkey']);
+
+                var KBigInt = tx.deterministicK(wif, hash);
+                var KBigInt0 = tx.deterministicK(wif, hash, 0);
+                var KBigInt1 = tx.deterministicK(wif, hash, 1);
+                var KBigInt15 = tx.deterministicK(wif, hash, 15);
+
+                var K = Crypto.util.bytesToHex(KBigInt.toByteArrayUnsigned());
+                var K0 = Crypto.util.bytesToHex(KBigInt0.toByteArrayUnsigned());
+                var K1 = Crypto.util.bytesToHex(KBigInt1.toByteArrayUnsigned());
+                var K15 = Crypto.util.bytesToHex(KBigInt15.toByteArrayUnsigned());
+
+                if (K != test_vectors[i]['k_bad00']) {
+                    result_txt += 'Failed Test #' + (i + 1) + '\n       K = ' + K + '\nExpected = ' + test_vectors[i]['k_bad00'] + '\n\n';
+                } else if (K0 != test_vectors[i]['k_bad00']) {
+                    result_txt += 'Failed Test #' + (i + 1) + '\n      K0 = ' + K0 + '\nExpected = ' + test_vectors[i]['k_bad00'] + '\n\n';
+                } else if (K1 != test_vectors[i]['k_bad01']) {
+                    result_txt += 'Failed Test #' + (i + 1) + '\n      K1 = ' + K1 + '\nExpected = ' + test_vectors[i]['k_bad01'] + '\n\n';
+                } else if (K15 != test_vectors[i]['k_bad15']) {
+                    result_txt += 'Failed Test #' + (i + 1) + '\n     K15 = ' + K15 + '\nExpected = ' + test_vectors[i]['k_bad15'] + '\n\n';
+                };
+            };
+
+            if (result_txt.length < 60) {
+                result_txt = 'All Tests OK!';
+            };
+
+            return result_txt;
+        };
+
+        /* start of hd functions, thanks bip32.org */
+        coinjs.hd = function(data) {
+
+            var r = {};
+
+            /* some hd value parsing */
+            r.parse = function() {
+
+                var bytes = [];
+
+                // some quick validation
+                if (typeof(data) == 'string') {
+                    var decoded = coinjs.base58decode(data);
+                    if (decoded.length == 82) {
+                        var checksum = decoded.slice(78, 82);
+                        var hash = Crypto.SHA256(Crypto.SHA256(decoded.slice(0, 78), {
+                            asBytes: true
+                        }), {
+                            asBytes: true
+                        });
+                        if (checksum[0] == hash[0] && checksum[1] == hash[1] && checksum[2] == hash[2] && checksum[3] == hash[3]) {
+                            bytes = decoded.slice(0, 78);
+                        }
+                    }
+                }
+
+                // actual parsing code
+                if (bytes && bytes.length > 0) {
+                    r.version = coinjs.uint(bytes.slice(0, 4), 4);
+                    r.depth = coinjs.uint(bytes.slice(4, 5), 1);
+                    r.parent_fingerprint = bytes.slice(5, 9);
+                    r.child_index = coinjs.uint(bytes.slice(9, 13), 4);
+                    r.chain_code = bytes.slice(13, 45);
+                    r.key_bytes = bytes.slice(45, 78);
+
+                    var c = coinjs.compressed; // get current default
+                    coinjs.compressed = true;
+
+                    if (r.key_bytes[0] == 0x00) {
+                        r.type = 'private';
+                        var privkey = (r.key_bytes).slice(1, 33);
+                        var privkeyHex = Crypto.util.bytesToHex(privkey);
+                        var pubkey = coinjs.newPubkey(privkeyHex);
+
+                        r.keys = {
+                            'privkey': privkeyHex,
+                            'pubkey': pubkey,
+                            'address': coinjs.pubkey2address(pubkey),
+                            'wif': coinjs.privkey2wif(privkeyHex)
+                        };
+
+                    } else if (r.key_bytes[0] == 0x02 || r.key_bytes[0] == 0x03) {
+                        r.type = 'public';
+                        var pubkeyHex = Crypto.util.bytesToHex(r.key_bytes);
+
+                        r.keys = {
+                            'pubkey': pubkeyHex,
+                            'address': coinjs.pubkey2address(pubkeyHex)
+                        };
+                    } else {
+                        r.type = 'invalid';
+                    }
+
+                    r.keys_extended = r.extend();
+
+                    coinjs.compressed = c; // reset to default
+                }
+
+                return r;
+            }
+
+            // extend prv/pub key
+            r.extend = function() {
+                var hd = coinjs.hd();
+                return hd.make({
+                    'depth': (this.depth * 1) + 1,
+                    'parent_fingerprint': this.parent_fingerprint,
+                    'child_index': this.child_index,
+                    'chain_code': this.chain_code,
+                    'privkey': this.keys.privkey,
+                    'pubkey': this.keys.pubkey
+                });
+            }
+
+            // derive from path
+            r.derive_path = function(path) {
+
+                if (path == 'm' || path == 'M' || path == 'm\'' || path == 'M\'') return this;
+
+                var p = path.split('/');
+                var hdp = coinjs.clone(this); // clone hd path
+
+                for (var i in p) {
+
+                    if (((i == 0) && c != 'm') || i == 'remove') {
+                        continue;
+                    }
+
+                    var c = p[i];
+
+                    var use_private = (c.length > 1) && (c[c.length - 1] == '\'');
+                    var child_index = parseInt(use_private ? c.slice(0, c.length - 1) : c) & 0x7fffffff;
+                    if (use_private)
+                        child_index += 0x80000000;
+
+                    hdp = hdp.derive(child_index);
+                    var key = ((hdp.keys_extended.privkey) && hdp.keys_extended.privkey != '') ? hdp.keys_extended.privkey : hdp.keys_extended.pubkey;
+                    hdp = coinjs.hd(key);
+                }
+                return hdp;
+            }
+
+            // derive key from index
+            r.derive = function(i) {
+
+                i = (i) ? i : 0;
+                var blob = (Crypto.util.hexToBytes(this.keys.pubkey)).concat(coinjs.numToBytes(i, 4).reverse());
+
+                var j = new jsSHA(Crypto.util.bytesToHex(blob), 'HEX');
+                var hash = j.getHMAC(Crypto.util.bytesToHex(r.chain_code), "HEX", "SHA-512", "HEX");
+
+                var il = new BigInteger(hash.slice(0, 64), 16);
+                var ir = Crypto.util.hexToBytes(hash.slice(64, 128));
+
+                var ecparams = EllipticCurve.getSECCurveByName("secp256k1");
+                var curve = ecparams.getCurve();
+
+                var k, key, pubkey, o;
+
+                o = coinjs.clone(this);
+                o.chain_code = ir;
+                o.child_index = i;
+
+                if (this.type == 'private') {
+                    // derive key pair from from a xprv key
+                    k = il.add(new BigInteger([0].concat(Crypto.util.hexToBytes(this.keys.privkey)))).mod(ecparams.getN());
+                    key = Crypto.util.bytesToHex(k.toByteArrayUnsigned());
+
+                    pubkey = coinjs.newPubkey(key);
+
+                    o.keys = {
+                        'privkey': key,
+                        'pubkey': pubkey,
+                        'wif': coinjs.privkey2wif(key),
+                        'address': coinjs.pubkey2address(pubkey)
+                    };
+
+                } else if (this.type == 'public') {
+                    // derive xpub key from an xpub key
+                    q = ecparams.curve.decodePointHex(this.keys.pubkey);
+                    var curvePt = ecparams.getG().multiply(il).add(q);
+
+                    var x = curvePt.getX().toBigInteger();
+                    var y = curvePt.getY().toBigInteger();
+
+                    var publicKeyBytesCompressed = EllipticCurve.integerToBytes(x, 32)
+                    if (y.isEven()) {
+                        publicKeyBytesCompressed.unshift(0x02)
+                    } else {
+                        publicKeyBytesCompressed.unshift(0x03)
+                    }
+                    pubkey = Crypto.util.bytesToHex(publicKeyBytesCompressed);
+
+                    o.keys = {
+                        'pubkey': pubkey,
+                        'address': coinjs.pubkey2address(pubkey)
+                    }
+                } else {
+                    // fail
+                }
+
+                o.parent_fingerprint = (ripemd160(Crypto.SHA256(Crypto.util.hexToBytes(r.keys.pubkey), {
+                    asBytes: true
+                }), {
+                    asBytes: true
+                })).slice(0, 4);
+                o.keys_extended = o.extend();
+                return o;
+            }
+
+            // make a master hd xprv/xpub
+            r.master = function(pass) {
+                var seed = (pass) ? Crypto.SHA256(pass) : coinjs.newPrivkey();
+                var hasher = new jsSHA(seed, 'HEX');
+                var I = hasher.getHMAC("Bitcoin seed", "TEXT", "SHA-512", "HEX");
+
+                var privkey = Crypto.util.hexToBytes(I.slice(0, 64));
+                var chain = Crypto.util.hexToBytes(I.slice(64, 128));
+
+                var hd = coinjs.hd();
+                return hd.make({
+                    'depth': 0,
+                    'parent_fingerprint': [0, 0, 0, 0],
+                    'child_index': 0,
+                    'chain_code': chain,
+                    'privkey': I.slice(0, 64),
+                    'pubkey': coinjs.newPubkey(I.slice(0, 64))
+                });
+            }
+
+            // encode data to a base58 string
+            r.make = function(data) { // { (int) depth, (array) parent_fingerprint, (int) child_index, (byte array) chain_code, (hex str) privkey, (hex str) pubkey}
+                var k = [];
+
+                //depth
+                k.push(data.depth * 1);
+
+                //parent fingerprint
+                k = k.concat(data.parent_fingerprint);
+
+                //child index
+                k = k.concat((coinjs.numToBytes(data.child_index, 4)).reverse());
+
+                //Chain code
+                k = k.concat(data.chain_code);
+
+                var o = {}; // results
+
+                //encode xprv key
+                if (data.privkey) {
+                    var prv = (coinjs.numToBytes(coinjs.hdkey.prv, 4)).reverse();
+                    prv = prv.concat(k);
+                    prv.push(0x00);
+                    prv = prv.concat(Crypto.util.hexToBytes(data.privkey));
+                    var hash = Crypto.SHA256(Crypto.SHA256(prv, {
+                        asBytes: true
+                    }), {
+                        asBytes: true
+                    });
+                    var checksum = hash.slice(0, 4);
+                    var ret = prv.concat(checksum);
+                    o.privkey = coinjs.base58encode(ret);
+                }
+
+                //encode xpub key
+                if (data.pubkey) {
+                    var pub = (coinjs.numToBytes(coinjs.hdkey.pub, 4)).reverse();
+                    pub = pub.concat(k);
+                    pub = pub.concat(Crypto.util.hexToBytes(data.pubkey));
+                    var hash = Crypto.SHA256(Crypto.SHA256(pub, {
+                        asBytes: true
+                    }), {
+                        asBytes: true
+                    });
+                    var checksum = hash.slice(0, 4);
+                    var ret = pub.concat(checksum);
+                    o.pubkey = coinjs.base58encode(ret);
+                }
+                return o;
+            }
+
+            return r.parse();
+        }
+
+
+        /* start of script functions */
+        coinjs.script = function(data) {
+            var r = {};
+
+            if (!data) {
+                r.buffer = [];
+            } else if ("string" == typeof data) {
+                r.buffer = Crypto.util.hexToBytes(data);
+            } else if (coinjs.isArray(data)) {
+                r.buffer = data;
+            } else if (data instanceof coinjs.script) {
+                r.buffer = data.buffer;
+            } else {
+                r.buffer = data;
+            }
+
+            /* parse buffer array */
+            r.parse = function() {
+
+                var self = this;
+                r.chunks = [];
+                var i = 0;
+
+                function readChunk(n) {
+                    self.chunks.push(self.buffer.slice(i, i + n));
+                    i += n;
+                };
+
+                while (i < this.buffer.length) {
+                    var opcode = this.buffer[i++];
+                    if (opcode >= 0xF0) {
+                        opcode = (opcode << 8) | this.buffer[i++];
+                    }
+
+                    var len;
+                    if (opcode > 0 && opcode < 76) { //OP_PUSHDATA1
+                        readChunk(opcode);
+                    } else if (opcode == 76) { //OP_PUSHDATA1
+                        len = this.buffer[i++];
+                        readChunk(len);
+                    } else if (opcode == 77) { //OP_PUSHDATA2
+                        len = (this.buffer[i++] << 8) | this.buffer[i++];
+                        readChunk(len);
+                    } else if (opcode == 78) { //OP_PUSHDATA4
+                        len = (this.buffer[i++] << 24) | (this.buffer[i++] << 16) | (this.buffer[i++] << 8) | this.buffer[i++];
+                        readChunk(len);
+                    } else {
+                        this.chunks.push(opcode);
+                    }
+
+                    if (i < 0x00) {
+                        break;
+                    }
+                }
+
+                return true;
+            };
+
+            /* decode the redeemscript of a multisignature transaction */
+            r.decodeRedeemScript = function(script) {
+                var r = false;
+                try {
+                    var s = coinjs.script(Crypto.util.hexToBytes(script));
+                    if ((s.chunks.length >= 3) && s.chunks[s.chunks.length - 1] == 174) { //OP_CHECKMULTISIG
+                        r = {};
+                        r.signaturesRequired = s.chunks[0] - 80;
+                        var pubkeys = [];
+                        for (var i = 1; i < s.chunks.length - 2; i++) {
+                            pubkeys.push(Crypto.util.bytesToHex(s.chunks[i]));
+                        }
+                        r.pubkeys = pubkeys;
+                        var multi = coinjs.pubkeys2MultisigAddress(pubkeys, r.signaturesRequired);
+                        r.address = multi['address'];
+                        r.type = 'multisig__'; // using __ for now to differentiat from the other object .type == "multisig"
+                        var rs = Crypto.util.bytesToHex(s.buffer);
+                        r.redeemscript = rs;
+
+                    } else if ((s.chunks.length == 2) && (s.buffer[0] == 0 && s.buffer[1] == 20)) { // SEGWIT
+                        r = {};
+                        r.type = "segwit__";
+                        var rs = Crypto.util.bytesToHex(s.buffer);
+                        r.address = coinjs.pubkey2address(rs, coinjs.multisig);
+                        r.redeemscript = rs;
+
+                    } else if (s.chunks.length == 5 && s.chunks[1] == 177 && s.chunks[2] == 117 && s.chunks[4] == 172) {
+                        // ^ <unlocktime> OP_CHECKLOCKTIMEVERIFY OP_DROP <pubkey> OP_CHECKSIG ^
+                        r = {}
+                        r.pubkey = Crypto.util.bytesToHex(s.chunks[3]);
+                        r.checklocktimeverify = coinjs.bytesToNum(s.chunks[0].slice());
+                        r.address = coinjs.simpleHodlAddress(r.pubkey, r.checklocktimeverify).address;
+                        var rs = Crypto.util.bytesToHex(s.buffer);
+                        r.redeemscript = rs;
+                        r.type = "hodl__";
+                    }
+                } catch (e) {
+                    // console.log(e);
+                    r = false;
+                }
+                return r;
+            }
+
+            /* create output script to spend */
+            r.spendToScript = function(address) {
+                var addr = coinjs.addressDecode(address);
+                var s = coinjs.script();
+                if (addr.type == "bech32") {
+                    s.writeOp(0);
+                    s.writeBytes(Crypto.util.hexToBytes(addr.redeemscript));
+                } else if (addr.version == coinjs.multisig) { // multisig address
+                    s.writeOp(169); //OP_HASH160
+                    s.writeBytes(addr.bytes);
+                    s.writeOp(135); //OP_EQUAL
+                } else { // regular address
+                    s.writeOp(118); //OP_DUP
+                    s.writeOp(169); //OP_HASH160
+                    s.writeBytes(addr.bytes);
+                    s.writeOp(136); //OP_EQUALVERIFY
+                    s.writeOp(172); //OP_CHECKSIG
+                }
+                return s;
+            }
+
+            /* geneate a (script) pubkey hash of the address - used for when signing */
+            r.pubkeyHash = function(address) {
+                var addr = coinjs.addressDecode(address);
+                var s = coinjs.script();
+                s.writeOp(118); //OP_DUP
+                s.writeOp(169); //OP_HASH160
+                s.writeBytes(addr.bytes);
+                s.writeOp(136); //OP_EQUALVERIFY
+                s.writeOp(172); //OP_CHECKSIG
+                return s;
+            }
+
+            /* write to buffer */
+            r.writeOp = function(op) {
+                this.buffer.push(op);
+                this.chunks.push(op);
+                return true;
+            }
+
+            /* write bytes to buffer */
+            r.writeBytes = function(data) {
+                if (data.length < 76) { //OP_PUSHDATA1
+                    this.buffer.push(data.length);
+                } else if (data.length <= 0xff) {
+                    this.buffer.push(76); //OP_PUSHDATA1
+                    this.buffer.push(data.length);
+                } else if (data.length <= 0xffff) {
+                    this.buffer.push(77); //OP_PUSHDATA2
+                    this.buffer.push(data.length & 0xff);
+                    this.buffer.push((data.length >>> 8) & 0xff);
+                } else {
+                    this.buffer.push(78); //OP_PUSHDATA4
+                    this.buffer.push(data.length & 0xff);
+                    this.buffer.push((data.length >>> 8) & 0xff);
+                    this.buffer.push((data.length >>> 16) & 0xff);
+                    this.buffer.push((data.length >>> 24) & 0xff);
+                }
+                this.buffer = this.buffer.concat(data);
+                this.chunks.push(data);
+                return true;
+            }
+
+            r.parse();
+            return r;
+        }
+
+        /* start of transaction functions */
+
+        /* create a new transaction object */
+        coinjs.transaction = function() {
+
+            var r = {};
+            r.version = 1;
+            r.lock_time = 0;
+            r.ins = [];
+            r.outs = [];
+            r.witness = false;
+            r.timestamp = null;
+            r.block = null;
+
+            /* add an input to a transaction */
+            r.addinput = function(txid, index, script, sequence) {
+                var o = {};
+                o.outpoint = {
+                    'hash': txid,
+                    'index': index
+                };
+                o.script = coinjs.script(script || []);
+                o.sequence = sequence || ((r.lock_time == 0) ? 4294967295 : 0);
+                return this.ins.push(o);
+            }
+
+            /* add an output to a transaction */
+            r.addoutput = function(address, value) {
+                var o = {};
+                o.value = new BigInteger('' + Math.round((value * 1) * 1e8), 10);
+                var s = coinjs.script();
+                o.script = s.spendToScript(address);
+
+                return this.outs.push(o);
+            }
+
+            /* add two outputs for stealth addresses to a transaction */
+            r.addstealth = function(stealth, value) {
+                var ephemeralKeyBigInt = BigInteger.fromByteArrayUnsigned(Crypto.util.hexToBytes(coinjs.newPrivkey()));
+                var curve = EllipticCurve.getSECCurveByName("secp256k1");
+
+                var p = EllipticCurve.fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F");
+                var a = BigInteger.ZERO;
+                var b = EllipticCurve.fromHex("7");
+                var calccurve = new EllipticCurve.CurveFp(p, a, b);
+
+                var ephemeralPt = curve.getG().multiply(ephemeralKeyBigInt);
+                var scanPt = calccurve.decodePointHex(stealth.scankey);
+                var sharedPt = scanPt.multiply(ephemeralKeyBigInt);
+                var stealthindexKeyBigInt = BigInteger.fromByteArrayUnsigned(Crypto.SHA256(sharedPt.getEncoded(true), {
+                    asBytes: true
+                }));
+
+                var stealthindexPt = curve.getG().multiply(stealthindexKeyBigInt);
+                var spendPt = calccurve.decodePointHex(stealth.spendkey);
+                var addressPt = spendPt.add(stealthindexPt);
+
+                var sendaddress = coinjs.pubkey2address(Crypto.util.bytesToHex(addressPt.getEncoded(true)));
+
+
+                var OPRETBytes = [6].concat(Crypto.util.randomBytes(4)).concat(ephemeralPt.getEncoded(true)); // ephemkey data
+                var q = coinjs.script();
+                q.writeOp(106); // OP_RETURN
+                q.writeBytes(OPRETBytes);
+                v = {};
+                v.value = 0;
+                v.script = q;
+
+                this.outs.push(v);
+
+                var o = {};
+                o.value = new BigInteger('' + Math.round((value * 1) * 1e8), 10);
+                var s = coinjs.script();
+                o.script = s.spendToScript(sendaddress);
+
+                return this.outs.push(o);
+            }
+
+            /* add data to a transaction */
+            r.adddata = function(data) {
+                var r = false;
+                if (((data.match(/^[a-f0-9]+$/gi)) && data.length < 160) && (data.length % 2) == 0) {
+                    var s = coinjs.script();
+                    s.writeOp(106); // OP_RETURN
+                    s.writeBytes(Crypto.util.hexToBytes(data));
+                    o = {};
+                    o.value = 0;
+                    o.script = s;
+                    return this.outs.push(o);
+                }
+                return r;
+            }
+
+            /* list unspent transactions */
+            r.listUnspent = function(address, callback) {
+                coinjs.ajax(coinjs.host + '?uid=' + coinjs.uid + '&key=' + coinjs.key + '&setmodule=addresses&request=unspent&address=' + address + '&r=' + Math.random(), callback, "GET");
+            }
+
+            /* list transaction data */
+            r.getTransaction = function(txid, callback) {
+                coinjs.ajax(coinjs.host + '?uid=' + coinjs.uid + '&key=' + coinjs.key + '&setmodule=bitcoin&request=gettransaction&txid=' + txid + '&r=' + Math.random(), callback, "GET");
+            }
+
+            /* add unspent to transaction */
+            r.addUnspent = function(address, callback, script, segwit, sequence) {
+                var self = this;
+                this.listUnspent(address, function(data) {
+                    var s = coinjs.script();
+                    var value = 0;
+                    var total = 0;
+                    var x = {};
+
+                    if (GLOBAL.DOMParser) {
+                        parser = new DOMParser();
+                        xmlDoc = parser.parseFromString(data, "text/xml");
+                    } else {
+                        xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
+                        xmlDoc.async = false;
+                        xmlDoc.loadXML(data);
+                    }
+
+                    var unspent = xmlDoc.getElementsByTagName("unspent")[0];
+
+                    if (unspent) {
+                        for (i = 1; i <= unspent.childElementCount; i++) {
+                            var u = xmlDoc.getElementsByTagName("unspent_" + i)[0]
+                            var txhash = (u.getElementsByTagName("tx_hash")[0].childNodes[0].nodeValue).match(/.{1,2}/g).reverse().join("") + '';
+                            var n = u.getElementsByTagName("tx_output_n")[0].childNodes[0].nodeValue;
+                            var scr = script || u.getElementsByTagName("script")[0].childNodes[0].nodeValue;
+
+                            if (segwit) {
+                                /* this is a small hack to include the value with the redeemscript to make the signing procedure smoother. 
+                                It is not standard and removed during the signing procedure. */
+
+                                s = coinjs.script();
+                                s.writeBytes(Crypto.util.hexToBytes(script));
+                                s.writeOp(0);
+                                s.writeBytes(coinjs.numToBytes(u.getElementsByTagName("value")[0].childNodes[0].nodeValue * 1, 8));
+                                scr = Crypto.util.bytesToHex(s.buffer);
+                            }
+
+                            var seq = sequence || false;
+                            self.addinput(txhash, n, scr, seq);
+                            value += u.getElementsByTagName("value")[0].childNodes[0].nodeValue * 1;
+                            total++;
+                        }
+                    }
+
+                    x.result = xmlDoc.getElementsByTagName("result")[0].childNodes[0].nodeValue;
+                    x.unspent = unspent;
+                    x.value = value;
+                    x.total = total;
+                    x.response = xmlDoc.getElementsByTagName("response")[0].childNodes[0].nodeValue;
+
+                    return callback(x);
+                });
+            }
+
+            /* add unspent and sign */
+            r.addUnspentAndSign = function(wif, callback) {
+                var self = this;
+                var address = coinjs.wif2address(wif);
+                self.addUnspent(address['address'], function(data) {
+                    self.sign(wif);
+                    return callback(data);
+                });
+            }
+
+            /* broadcast a transaction */
+            r.broadcast = function(callback, txhex) {
+                var tx = txhex || this.serialize();
+                coinjs.ajax(coinjs.host + '?uid=' + coinjs.uid + '&key=' + coinjs.key + '&setmodule=bitcoin&request=sendrawtransaction', callback, "POST", ["rawtx=" + tx]);
+            }
+
+            /* generate the transaction hash to sign from a transaction input */
+            r.transactionHash = function(index, sigHashType) {
+
+                var clone = coinjs.clone(this);
+                var shType = sigHashType || 1;
+
+                /* black out all other ins, except this one */
+                for (var i = 0; i < clone.ins.length; i++) {
+                    if (index != i) {
+                        clone.ins[i].script = coinjs.script();
+                    }
+                }
+
+                var extract = this.extractScriptKey(index);
+                clone.ins[index].script = coinjs.script(extract['script']);
+
+                if ((clone.ins) && clone.ins[index]) {
+
+                    /* SIGHASH : For more info on sig hashs see https://en.bitcoin.it/wiki/OP_CHECKSIG
+                    	and https://bitcoin.org/en/developer-guide#signature-hash-type */
+
+                    if (shType == 1) {
+                        //SIGHASH_ALL 0x01
+
+                    } else if (shType == 2) {
+                        //SIGHASH_NONE 0x02
+                        clone.outs = [];
+                        for (var i = 0; i < clone.ins.length; i++) {
+                            if (index != i) {
+                                clone.ins[i].sequence = 0;
+                            }
+                        }
+
+                    } else if (shType == 3) {
+
+                        //SIGHASH_SINGLE 0x03
+                        clone.outs.length = index + 1;
+
+                        for (var i = 0; i < index; i++) {
+                            clone.outs[i].value = -1;
+                            clone.outs[i].script.buffer = [];
+                        }
+
+                        for (var i = 0; i < clone.ins.length; i++) {
+                            if (index != i) {
+                                clone.ins[i].sequence = 0;
+                            }
+                        }
+
+                    } else if (shType >= 128) {
+                        //SIGHASH_ANYONECANPAY 0x80
+                        clone.ins = [clone.ins[index]];
+
+                        if (shType == 129) {
+                            // SIGHASH_ALL + SIGHASH_ANYONECANPAY
+
+                        } else if (shType == 130) {
+                            // SIGHASH_NONE + SIGHASH_ANYONECANPAY
+                            clone.outs = [];
+
+                        } else if (shType == 131) {
+                            // SIGHASH_SINGLE + SIGHASH_ANYONECANPAY
+                            clone.outs.length = index + 1;
+                            for (var i = 0; i < index; i++) {
+                                clone.outs[i].value = -1;
+                                clone.outs[i].script.buffer = [];
+                            }
+                        }
+                    }
+
+                    var buffer = Crypto.util.hexToBytes(clone.serialize());
+                    buffer = buffer.concat(coinjs.numToBytes(parseInt(shType), 4));
+                    var hash = Crypto.SHA256(buffer, {
+                        asBytes: true
+                    });
+                    var r = Crypto.util.bytesToHex(Crypto.SHA256(hash, {
+                        asBytes: true
+                    }));
+                    return r;
+                } else {
+                    return false;
+                }
+            }
+
+            /* generate a segwit transaction hash to sign from a transaction input */
+            r.transactionHashSegWitV0 = function(index, sigHashType) {
+                /* 
+                   Notice: coinb.in by default, deals with segwit transactions in a non-standard way.
+                   Segwit transactions require that input values are included in the transaction hash.
+                   To save wasting resources and potentially slowing down this service, we include the amount with the 
+                   redeem script to generate the transaction hash and remove it after its signed.
+                */
+
+                // start redeem script check
+                var extract = this.extractScriptKey(index);
+                if (extract['type'] != 'segwit') {
+                    return {
+                        'result': 0,
+                        'fail': 'redeemscript',
+                        'response': 'redeemscript missing or not valid for segwit'
+                    };
+                }
+
+                if (extract['value'] == -1) {
+                    return {
+                        'result': 0,
+                        'fail': 'value',
+                        'response': 'unable to generate a valid segwit hash without a value'
+                    };
+                }
+
+                var scriptcode = Crypto.util.hexToBytes(extract['script']);
+
+                // end of redeem script check
+
+                /* P2WPKH */
+                if (scriptcode.length == 20) {
+                    scriptcode = [0x00, 0x14].concat(scriptcode);
+                }
+
+                if (scriptcode.length == 22) {
+                    scriptcode = scriptcode.slice(1);
+                    scriptcode.unshift(25, 118, 169);
+                    scriptcode.push(136, 172);
+                }
+
+                var value = coinjs.numToBytes(extract['value'], 8);
+
+                // start
+
+                var zero = coinjs.numToBytes(0, 32);
+                var version = coinjs.numToBytes(parseInt(this.version), 4);
+
+                var bufferTmp = [];
+                if (!(sigHashType >= 80)) { // not sighash anyonecanpay 
+                    for (var i = 0; i < this.ins.length; i++) {
+                        bufferTmp = bufferTmp.concat(Crypto.util.hexToBytes(this.ins[i].outpoint.hash).reverse());
+                        bufferTmp = bufferTmp.concat(coinjs.numToBytes(this.ins[i].outpoint.index, 4));
+                    }
+                }
+                var hashPrevouts = bufferTmp.length >= 1 ? Crypto.SHA256(Crypto.SHA256(bufferTmp, {
+                    asBytes: true
+                }), {
+                    asBytes: true
+                }) : zero;
+
+                var bufferTmp = [];
+                if (!(sigHashType >= 80) && sigHashType != 2 && sigHashType != 3) { // not sighash anyonecanpay & single & none
+                    for (var i = 0; i < this.ins.length; i++) {
+                        bufferTmp = bufferTmp.concat(coinjs.numToBytes(this.ins[i].sequence, 4));
+                    }
+                }
+                var hashSequence = bufferTmp.length >= 1 ? Crypto.SHA256(Crypto.SHA256(bufferTmp, {
+                    asBytes: true
+                }), {
+                    asBytes: true
+                }) : zero;
+
+                var outpoint = Crypto.util.hexToBytes(this.ins[index].outpoint.hash).reverse();
+                outpoint = outpoint.concat(coinjs.numToBytes(this.ins[index].outpoint.index, 4));
+
+                var nsequence = coinjs.numToBytes(this.ins[index].sequence, 4);
+                var hashOutputs = zero;
+                var bufferTmp = [];
+                if (sigHashType != 2 && sigHashType != 3) { // not sighash single & none
+                    for (var i = 0; i < this.outs.length; i++) {
+                        bufferTmp = bufferTmp.concat(coinjs.numToBytes(this.outs[i].value, 8));
+                        bufferTmp = bufferTmp.concat(coinjs.numToVarInt(this.outs[i].script.buffer.length));
+                        bufferTmp = bufferTmp.concat(this.outs[i].script.buffer);
+                    }
+                    hashOutputs = Crypto.SHA256(Crypto.SHA256(bufferTmp, {
+                        asBytes: true
+                    }), {
+                        asBytes: true
+                    });
+
+                } else if ((sigHashType == 2) && index < this.outs.length) { // is sighash single
+                    bufferTmp = bufferTmp.concat(coinjs.numToBytes(this.outs[index].value, 8));
+                    bufferTmp = bufferTmp.concat(coinjs.numToVarInt(this.outs[i].script.buffer.length));
+                    bufferTmp = bufferTmp.concat(this.outs[index].script.buffer);
+                    hashOutputs = Crypto.SHA256(Crypto.SHA256(bufferTmp, {
+                        asBytes: true
+                    }), {
+                        asBytes: true
+                    });
+                }
+
+                var locktime = coinjs.numToBytes(this.lock_time, 4);
+                var sighash = coinjs.numToBytes(sigHashType, 4);
+
+                var buffer = [];
+                buffer = buffer.concat(version);
+                buffer = buffer.concat(hashPrevouts);
+                buffer = buffer.concat(hashSequence);
+                buffer = buffer.concat(outpoint);
+                buffer = buffer.concat(scriptcode);
+                buffer = buffer.concat(value);
+                buffer = buffer.concat(nsequence);
+                buffer = buffer.concat(hashOutputs);
+                buffer = buffer.concat(locktime);
+                buffer = buffer.concat(sighash);
+
+                var hash = Crypto.SHA256(buffer, {
+                    asBytes: true
+                });
+                return {
+                    'result': 1,
+                    'hash': Crypto.util.bytesToHex(Crypto.SHA256(hash, {
+                        asBytes: true
+                    })),
+                    'response': 'hash generated'
+                };
+            }
+
+            /* extract the scriptSig, used in the transactionHash() function */
+            r.extractScriptKey = function(index) {
+                if (this.ins[index]) {
+                    if ((this.ins[index].script.chunks.length == 5) && this.ins[index].script.chunks[4] == 172 && coinjs.isArray(this.ins[index].script.chunks[2])) { //OP_CHECKSIG
+                        // regular scriptPubkey (not signed)
+                        return {
+                            'type': 'scriptpubkey',
+                            'signed': 'false',
+                            'signatures': 0,
+                            'script': Crypto.util.bytesToHex(this.ins[index].script.buffer)
+                        };
+                    } else if ((this.ins[index].script.chunks.length == 2) && this.ins[index].script.chunks[0][0] == 48 && this.ins[index].script.chunks[1].length == 5 && this.ins[index].script.chunks[1][1] == 177) { //OP_CHECKLOCKTIMEVERIFY
+                        // hodl script (signed)
+                        return {
+                            'type': 'hodl',
+                            'signed': 'true',
+                            'signatures': 1,
+                            'script': Crypto.util.bytesToHex(this.ins[index].script.buffer)
+                        };
+                    } else if ((this.ins[index].script.chunks.length == 2) && this.ins[index].script.chunks[0][0] == 48) {
+                        // regular scriptPubkey (probably signed)
+                        return {
+                            'type': 'scriptpubkey',
+                            'signed': 'true',
+                            'signatures': 1,
+                            'script': Crypto.util.bytesToHex(this.ins[index].script.buffer)
+                        };
+                    } else if (this.ins[index].script.chunks.length == 5 && this.ins[index].script.chunks[1] == 177) { //OP_CHECKLOCKTIMEVERIFY
+                        // hodl script (not signed)
+                        return {
+                            'type': 'hodl',
+                            'signed': 'false',
+                            'signatures': 0,
+                            'script': Crypto.util.bytesToHex(this.ins[index].script.buffer)
+                        };
+                    } else if ((this.ins[index].script.chunks.length <= 3 && this.ins[index].script.chunks.length > 0) && ((this.ins[index].script.chunks[0].length == 22 && this.ins[index].script.chunks[0][0] == 0) || (this.ins[index].script.chunks[0].length == 20 && this.ins[index].script.chunks[1] == 0))) {
+                        var signed = ((this.witness[index]) && this.witness[index].length == 2) ? 'true' : 'false';
+                        var sigs = (signed == 'true') ? 1 : 0;
+                        var value = -1; // no value found
+                        if ((this.ins[index].script.chunks[2]) && this.ins[index].script.chunks[2].length == 8) {
+                            value = coinjs.bytesToNum(this.ins[index].script.chunks[2]); // value found encoded in transaction (THIS IS NON STANDARD)
+                        }
+                        return {
+                            'type': 'segwit',
+                            'signed': signed,
+                            'signatures': sigs,
+                            'script': Crypto.util.bytesToHex(this.ins[index].script.chunks[0]),
+                            'value': value
+                        };
+                    } else if (this.ins[index].script.chunks[0] == 0 && this.ins[index].script.chunks[this.ins[index].script.chunks.length - 1][this.ins[index].script.chunks[this.ins[index].script.chunks.length - 1].length - 1] == 174) { // OP_CHECKMULTISIG
+                        // multisig script, with signature(s) included
+                        var sigcount = 0;
+                        for (i = 1; i < this.ins[index].script.chunks.length - 1; i++) {
+                            if (this.ins[index].script.chunks[i] != 0) {
+                                sigcount++;
+                            }
+                        }
+
+                        return {
+                            'type': 'multisig',
+                            'signed': 'true',
+                            'signatures': sigcount,
+                            'script': Crypto.util.bytesToHex(this.ins[index].script.chunks[this.ins[index].script.chunks.length - 1])
+                        };
+                    } else if (this.ins[index].script.chunks[0] >= 80 && this.ins[index].script.chunks[this.ins[index].script.chunks.length - 1] == 174) { // OP_CHECKMULTISIG
+                        // multisig script, without signature!
+                        return {
+                            'type': 'multisig',
+                            'signed': 'false',
+                            'signatures': 0,
+                            'script': Crypto.util.bytesToHex(this.ins[index].script.buffer)
+                        };
+                    } else if (this.ins[index].script.chunks.length == 0) {
+                        // empty
+                        //bech32 witness check
+                        var signed = ((this.witness[index]) && this.witness[index].length == 2) ? 'true' : 'false';
+                        var sigs = (signed == 'true') ? 1 : 0;
+                        return {
+                            'type': 'empty',
+                            'signed': signed,
+                            'signatures': sigs,
+                            'script': ''
+                        };
+                    } else {
+                        // something else
+                        return {
+                            'type': 'unknown',
+                            'signed': 'false',
+                            'signatures': 0,
+                            'script': Crypto.util.bytesToHex(this.ins[index].script.buffer)
+                        };
+                    }
+                } else {
+                    return false;
+                }
+            }
+
+            /* generate a signature from a transaction hash */
+            r.transactionSig = function(index, wif, sigHashType, txhash) {
+
+                function serializeSig(r, s) {
+                    var rBa = r.toByteArraySigned();
+                    var sBa = s.toByteArraySigned();
+
+                    var sequence = [];
+                    sequence.push(0x02); // INTEGER
+                    sequence.push(rBa.length);
+                    sequence = sequence.concat(rBa);
+
+                    sequence.push(0x02); // INTEGER
+                    sequence.push(sBa.length);
+                    sequence = sequence.concat(sBa);
+
+                    sequence.unshift(sequence.length);
+                    sequence.unshift(0x30); // SEQUENCE
+
+                    return sequence;
+                }
+
+                var shType = sigHashType || 1;
+                var hash = txhash || Crypto.util.hexToBytes(this.transactionHash(index, shType));
+
+                if (hash) {
+                    var curve = EllipticCurve.getSECCurveByName("secp256k1");
+                    var key = coinjs.wif2privkey(wif);
+                    var priv = BigInteger.fromByteArrayUnsigned(Crypto.util.hexToBytes(key['privkey']));
+                    var n = curve.getN();
+                    var e = BigInteger.fromByteArrayUnsigned(hash);
+                    var badrs = 0
+                    do {
+                        var k = this.deterministicK(wif, hash, badrs);
+                        var G = curve.getG();
+                        var Q = G.multiply(k);
+                        var r = Q.getX().toBigInteger().mod(n);
+                        var s = k.modInverse(n).multiply(e.add(priv.multiply(r))).mod(n);
+                        badrs++
+                    } while (r.compareTo(BigInteger.ZERO) <= 0 || s.compareTo(BigInteger.ZERO) <= 0);
+
+                    // Force lower s values per BIP62
+                    var halfn = n.shiftRight(1);
+                    if (s.compareTo(halfn) > 0) {
+                        s = n.subtract(s);
+                    };
+
+                    var sig = serializeSig(r, s);
+                    sig.push(parseInt(shType, 10));
+
+                    return Crypto.util.bytesToHex(sig);
+                } else {
+                    return false;
+                }
+            }
+
+            // https://tools.ietf.org/html/rfc6979#section-3.2
+            r.deterministicK = function(wif, hash, badrs) {
+                // if r or s were invalid when this function was used in signing,
+                // we do not want to actually compute r, s here for efficiency, so,
+                // we can increment badrs. explained at end of RFC 6979 section 3.2
+
+                // wif is b58check encoded wif privkey.
+                // hash is byte array of transaction digest.
+                // badrs is used only if the k resulted in bad r or s.
+
+                // some necessary things out of the way for clarity.
+                badrs = badrs || 0;
+                var key = coinjs.wif2privkey(wif);
+                var x = Crypto.util.hexToBytes(key['privkey'])
+                var curve = EllipticCurve.getSECCurveByName("secp256k1");
+                var N = curve.getN();
+
+                // Step: a
+                // hash is a byteArray of the message digest. so h1 == hash in our case
+
+                // Step: b
+                var v = [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1];
+
+                // Step: c
+                var k = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
+
+                // Step: d
+                k = Crypto.HMAC(Crypto.SHA256, v.concat([0]).concat(x).concat(hash), k, {
+                    asBytes: true
+                });
+
+                // Step: e
+                v = Crypto.HMAC(Crypto.SHA256, v, k, {
+                    asBytes: true
+                });
+
+                // Step: f
+                k = Crypto.HMAC(Crypto.SHA256, v.concat([1]).concat(x).concat(hash), k, {
+                    asBytes: true
+                });
+
+                // Step: g
+                v = Crypto.HMAC(Crypto.SHA256, v, k, {
+                    asBytes: true
+                });
+
+                // Step: h1
+                var T = [];
+
+                // Step: h2 (since we know tlen = qlen, just copy v to T.)
+                v = Crypto.HMAC(Crypto.SHA256, v, k, {
+                    asBytes: true
+                });
+                T = v;
+
+                // Step: h3
+                var KBigInt = BigInteger.fromByteArrayUnsigned(T);
+
+                // loop if KBigInt is not in the range of [1, N-1] or if badrs needs incrementing.
+                var i = 0
+                while (KBigInt.compareTo(N) >= 0 || KBigInt.compareTo(BigInteger.ZERO) <= 0 || i < badrs) {
+                    k = Crypto.HMAC(Crypto.SHA256, v.concat([0]), k, {
+                        asBytes: true
+                    });
+                    v = Crypto.HMAC(Crypto.SHA256, v, k, {
+                        asBytes: true
+                    });
+                    v = Crypto.HMAC(Crypto.SHA256, v, k, {
+                        asBytes: true
+                    });
+                    T = v;
+                    KBigInt = BigInteger.fromByteArrayUnsigned(T);
+                    i++
+                };
+
+                return KBigInt;
+            };
+
+            /* sign a "standard" input */
+            r.signinput = function(index, wif, sigHashType) {
+                var key = coinjs.wif2pubkey(wif);
+                var shType = sigHashType || 1;
+                var signature = this.transactionSig(index, wif, shType);
+                var s = coinjs.script();
+                s.writeBytes(Crypto.util.hexToBytes(signature));
+                s.writeBytes(Crypto.util.hexToBytes(key['pubkey']));
+                this.ins[index].script = s;
+                return true;
+            }
+
+            /* signs a time locked / hodl input */
+            r.signhodl = function(index, wif, sigHashType) {
+                var shType = sigHashType || 1;
+                var signature = this.transactionSig(index, wif, shType);
+                var redeemScript = this.ins[index].script.buffer
+                var s = coinjs.script();
+                s.writeBytes(Crypto.util.hexToBytes(signature));
+                s.writeBytes(redeemScript);
+                this.ins[index].script = s;
+                return true;
+            }
+
+            /* sign a multisig input */
+            r.signmultisig = function(index, wif, sigHashType) {
+
+                function scriptListPubkey(redeemScript) {
+                    var r = {};
+                    for (var i = 1; i < redeemScript.chunks.length - 2; i++) {
+                        r[i] = Crypto.util.hexToBytes(coinjs.pubkeydecompress(Crypto.util.bytesToHex(redeemScript.chunks[i])));
+                    }
+                    return r;
+                }
+
+                function scriptListSigs(scriptSig) {
+                    var r = {};
+                    var c = 0;
+                    if (scriptSig.chunks[0] == 0 && scriptSig.chunks[scriptSig.chunks.length - 1][scriptSig.chunks[scriptSig.chunks.length - 1].length - 1] == 174) {
+                        for (var i = 1; i < scriptSig.chunks.length - 1; i++) {
+                            if (scriptSig.chunks[i] != 0) {
+                                c++;
+                                r[c] = scriptSig.chunks[i];
+                            }
+                        }
+                    }
+                    return r;
+                }
+
+                var redeemScript = (this.ins[index].script.chunks[this.ins[index].script.chunks.length - 1] == 174) ? this.ins[index].script.buffer : this.ins[index].script.chunks[this.ins[index].script.chunks.length - 1];
+
+                var pubkeyList = scriptListPubkey(coinjs.script(redeemScript));
+                var sigsList = scriptListSigs(this.ins[index].script);
+
+                var shType = sigHashType || 1;
+                var sighash = Crypto.util.hexToBytes(this.transactionHash(index, shType));
+                var signature = Crypto.util.hexToBytes(this.transactionSig(index, wif, shType));
+
+                sigsList[coinjs.countObject(sigsList) + 1] = signature;
+
+                var s = coinjs.script();
+
+                s.writeOp(0);
+
+                for (x in pubkeyList) {
+                    for (y in sigsList) {
+                        this.ins[index].script.buffer = redeemScript;
+                        sighash = Crypto.util.hexToBytes(this.transactionHash(index, sigsList[y].slice(-1)[0] * 1));
+                        if (coinjs.verifySignature(sighash, sigsList[y], pubkeyList[x])) {
+                            s.writeBytes(sigsList[y]);
+                        }
+                    }
+                }
+
+                s.writeBytes(redeemScript);
+                this.ins[index].script = s;
+                return true;
+            }
+
+            /* sign segwit input */
+            r.signsegwit = function(index, wif, sigHashType) {
+                var shType = sigHashType || 1;
+
+                var wif2 = coinjs.wif2pubkey(wif);
+                var segwit = coinjs.segwitAddress(wif2['pubkey']);
+                var bech32 = coinjs.bech32Address(wif2['pubkey']);
+
+                if ((segwit['redeemscript'] == Crypto.util.bytesToHex(this.ins[index].script.chunks[0])) || (bech32['redeemscript'] == Crypto.util.bytesToHex(this.ins[index].script.chunks[0]))) {
+                    var txhash = this.transactionHashSegWitV0(index, shType);
+
+                    if (txhash.result == 1) {
+
+                        var segwitHash = Crypto.util.hexToBytes(txhash.hash);
+                        var signature = this.transactionSig(index, wif, shType, segwitHash);
+
+                        // remove any non standard data we store, i.e. input value
+                        var script = coinjs.script();
+                        script.writeBytes(this.ins[index].script.chunks[0]);
+                        this.ins[index].script = script;
+
+                        if (!coinjs.isArray(this.witness)) {
+                            this.witness = new Array(this.ins.length);
+                            this.witness.fill([]);
+                        }
+
+                        this.witness[index] = ([signature, wif2['pubkey']]);
+
+                        // bech32, empty redeemscript
+                        if (bech32['redeemscript'] == Crypto.util.bytesToHex(this.ins[index].script.chunks[0])) {
+                            this.ins[index].script = coinjs.script();
+                        }
+
+                        /* attempt to reorder witness data as best as we can. 
+                           data can't be easily validated at this stage as 
+                           we dont have access to the inputs value and 
+                           making a web call will be too slow. */
+
+                        /*
+                        var witness_order = [];
+                        var witness_used = [];
+                        for (var i = 0; i < this.ins.length; i++) {
+                            for (var y = 0; y < this.witness.length; y++) {
+                                if (!witness_used.includes(y)) {
+                                    var sw = coinjs.segwitAddress(this.witness[y][1]);
+                                    var b32 = coinjs.bech32Address(this.witness[y][1]);
+                                    var rs = '';
+
+                                    if (this.ins[i].script.chunks.length >= 1) {
+                                        rs = Crypto.util.bytesToHex(this.ins[i].script.chunks[0]);
+                                    } else if (this.ins[i].script.chunks.length == 0) {
+                                        rs = b32['redeemscript'];
+                                    }
+
+                                    if ((sw['redeemscript'] == rs) || (b32['redeemscript'] == rs)) {
+                                        witness_order.push(this.witness[y]);
+                                        witness_used.push(y);
+
+                                        // bech32, empty redeemscript
+                                        if (b32['redeemscript'] == rs) {
+                                            this.ins[index].script = coinjs.script();
+                                        }
+                                        break;
+                                    }
+                                }
+                            }
+                        }
+
+                        this.witness = witness_order;
+                        */
+                    }
+                }
+                return true;
+            }
+
+            /* sign inputs */
+            r.sign = function(wif, sigHashType) {
+                var shType = sigHashType || 1;
+                for (var i = 0; i < this.ins.length; i++) {
+                    var d = this.extractScriptKey(i);
+
+                    var w2a = coinjs.wif2address(wif);
+                    var script = coinjs.script();
+                    var pubkeyHash = script.pubkeyHash(w2a['address']);
+
+                    if (((d['type'] == 'scriptpubkey' && d['script'] == Crypto.util.bytesToHex(pubkeyHash.buffer)) || d['type'] == 'empty') && d['signed'] == "false") {
+                        this.signinput(i, wif, shType);
+
+                    } else if (d['type'] == 'hodl' && d['signed'] == "false") {
+                        this.signhodl(i, wif, shType);
+
+                    } else if (d['type'] == 'multisig') {
+                        this.signmultisig(i, wif, shType);
+
+                    } else if (d['type'] == 'segwit') {
+                        this.signsegwit(i, wif, shType);
+
+                    } else {
+                        // could not sign
+                    }
+                }
+                return this.serialize();
+            }
+
+            /* serialize a transaction */
+            r.serialize = function() {
+                var buffer = [];
+                buffer = buffer.concat(coinjs.numToBytes(parseInt(this.version), 4));
+
+                if (coinjs.isArray(this.witness)) {
+                    buffer = buffer.concat([0x00, 0x01]);
+                }
+
+                buffer = buffer.concat(coinjs.numToVarInt(this.ins.length));
+                for (var i = 0; i < this.ins.length; i++) {
+                    var txin = this.ins[i];
+                    buffer = buffer.concat(Crypto.util.hexToBytes(txin.outpoint.hash).reverse());
+                    buffer = buffer.concat(coinjs.numToBytes(parseInt(txin.outpoint.index), 4));
+                    var scriptBytes = txin.script.buffer;
+                    buffer = buffer.concat(coinjs.numToVarInt(scriptBytes.length));
+                    buffer = buffer.concat(scriptBytes);
+                    buffer = buffer.concat(coinjs.numToBytes(parseInt(txin.sequence), 4));
+                }
+                buffer = buffer.concat(coinjs.numToVarInt(this.outs.length));
+
+                for (var i = 0; i < this.outs.length; i++) {
+                    var txout = this.outs[i];
+                    buffer = buffer.concat(coinjs.numToBytes(txout.value, 8));
+                    var scriptBytes = txout.script.buffer;
+                    buffer = buffer.concat(coinjs.numToVarInt(scriptBytes.length));
+                    buffer = buffer.concat(scriptBytes);
+                }
+
+                if ((coinjs.isArray(this.witness)) && this.witness.length >= 1) {
+                    for (var i = 0; i < this.witness.length; i++) {
+                        buffer = buffer.concat(coinjs.numToVarInt(this.witness[i].length));
+                        for (var x = 0; x < this.witness[i].length; x++) {
+                            buffer = buffer.concat(coinjs.numToVarInt(Crypto.util.hexToBytes(this.witness[i][x]).length));
+                            buffer = buffer.concat(Crypto.util.hexToBytes(this.witness[i][x]));
+                        }
+                    }
+                }
+
+                buffer = buffer.concat(coinjs.numToBytes(parseInt(this.lock_time), 4));
+                return Crypto.util.bytesToHex(buffer);
+            }
+
+            /* deserialize a transaction */
+            r.deserialize = function(buffer) {
+                if (typeof buffer == "string") {
+                    buffer = Crypto.util.hexToBytes(buffer)
+                }
+
+                var pos = 0;
+                var witness = false;
+
+                var readAsInt = function(bytes) {
+                    if (bytes == 0) return 0;
+                    pos++;
+                    return buffer[pos - 1] + readAsInt(bytes - 1) * 256;
+                }
+
+                var readVarInt = function() {
+                    pos++;
+                    if (buffer[pos - 1] < 253) {
+                        return buffer[pos - 1];
+                    }
+                    return readAsInt(buffer[pos - 1] - 251);
+                }
+
+                var readBytes = function(bytes) {
+                    pos += bytes;
+                    return buffer.slice(pos - bytes, pos);
+                }
+
+                var readVarString = function() {
+                    var size = readVarInt();
+                    return readBytes(size);
+                }
+
+                var obj = new coinjs.transaction();
+                obj.version = readAsInt(4);
+
+                if (buffer[pos] == 0x00 && buffer[pos + 1] == 0x01) {
+                    // segwit transaction
+                    witness = true;
+                    obj.witness = [];
+                    pos += 2;
+                }
+
+                var ins = readVarInt();
+                for (var i = 0; i < ins; i++) {
+                    obj.ins.push({
+                        outpoint: {
+                            hash: Crypto.util.bytesToHex(readBytes(32).reverse()),
+                            index: readAsInt(4)
+                        },
+                        script: coinjs.script(readVarString()),
+                        sequence: readAsInt(4)
+                    });
+                }
+
+                var outs = readVarInt();
+                for (var i = 0; i < outs; i++) {
+                    obj.outs.push({
+                        value: coinjs.bytesToNum(readBytes(8)),
+                        script: coinjs.script(readVarString())
+                    });
+                }
+
+                if (witness == true) {
+                    for (i = 0; i < ins; ++i) {
+                        var count = readVarInt();
+                        var vector = [];
+                        if (!coinjs.isArray(obj.witness[i])) {
+                            obj.witness[i] = [];
+                        }
+                        for (var y = 0; y < count; y++) {
+                            var slice = readVarInt();
+                            pos += slice;
+                            obj.witness[i].push(Crypto.util.bytesToHex(buffer.slice(pos - slice, pos)));
+                        }
+                    }
+                }
+
+                obj.lock_time = readAsInt(4);
+                return obj;
+            }
+
+            r.size = function() {
+                return ((this.serialize()).length / 2).toFixed(0);
+            }
+
+            return r;
+        }
+
+        /* start of signature vertification functions */
+
+        coinjs.verifySignature = function(hash, sig, pubkey) {
+
+            function parseSig(sig) {
+                var cursor;
+                if (sig[0] != 0x30)
+                    throw new Error("Signature not a valid DERSequence");
+
+                cursor = 2;
+                if (sig[cursor] != 0x02)
+                    throw new Error("First element in signature must be a DERInteger");;
+
+                var rBa = sig.slice(cursor + 2, cursor + 2 + sig[cursor + 1]);
+
+                cursor += 2 + sig[cursor + 1];
+                if (sig[cursor] != 0x02)
+                    throw new Error("Second element in signature must be a DERInteger");
+
+                var sBa = sig.slice(cursor + 2, cursor + 2 + sig[cursor + 1]);
+
+                cursor += 2 + sig[cursor + 1];
+
+                var r = BigInteger.fromByteArrayUnsigned(rBa);
+                var s = BigInteger.fromByteArrayUnsigned(sBa);
+
+                return {
+                    r: r,
+                    s: s
+                };
+            }
+
+            var r, s;
+
+            if (coinjs.isArray(sig)) {
+                var obj = parseSig(sig);
+                r = obj.r;
+                s = obj.s;
+            } else if ("object" === typeof sig && sig.r && sig.s) {
+                r = sig.r;
+                s = sig.s;
+            } else {
+                throw "Invalid value for signature";
+            }
+
+            var Q;
+            if (coinjs.isArray(pubkey)) {
+                var ecparams = EllipticCurve.getSECCurveByName("secp256k1");
+                Q = EllipticCurve.PointFp.decodeFrom(ecparams.getCurve(), pubkey);
+            } else {
+                throw "Invalid format for pubkey value, must be byte array";
+            }
+            var e = BigInteger.fromByteArrayUnsigned(hash);
+
+            return coinjs.verifySignatureRaw(e, r, s, Q);
+        }
+
+        coinjs.verifySignatureRaw = function(e, r, s, Q) {
+            var ecparams = EllipticCurve.getSECCurveByName("secp256k1");
+            var n = ecparams.getN();
+            var G = ecparams.getG();
+
+            if (r.compareTo(BigInteger.ONE) < 0 || r.compareTo(n) >= 0)
+                return false;
+
+            if (s.compareTo(BigInteger.ONE) < 0 || s.compareTo(n) >= 0)
+                return false;
+
+            var c = s.modInverse(n);
+
+            var u1 = e.multiply(c).mod(n);
+            var u2 = r.multiply(c).mod(n);
+
+            var point = G.multiply(u1).add(Q.multiply(u2));
+
+            var v = point.getX().toBigInteger().mod(n);
+
+            return v.equals(r);
+        }
+
+        /* start of privates functions */
+
+        /* base58 encode function */
+        coinjs.base58encode = function(buffer) {
+            var alphabet = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
+            var base = BigInteger.valueOf(58);
+
+            var bi = BigInteger.fromByteArrayUnsigned(buffer);
+            var chars = [];
+
+            while (bi.compareTo(base) >= 0) {
+                var mod = bi.mod(base);
+                chars.unshift(alphabet[mod.intValue()]);
+                bi = bi.subtract(mod).divide(base);
+            }
+
+            chars.unshift(alphabet[bi.intValue()]);
+            for (var i = 0; i < buffer.length; i++) {
+                if (buffer[i] == 0x00) {
+                    chars.unshift(alphabet[0]);
+                } else break;
+            }
+            return chars.join('');
+        }
+
+        /* base58 decode function */
+        coinjs.base58decode = function(buffer) {
+            var alphabet = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
+            var base = BigInteger.valueOf(58);
+            var validRegex = /^[1-9A-HJ-NP-Za-km-z]+$/;
+
+            var bi = BigInteger.valueOf(0);
+            var leadingZerosNum = 0;
+            for (var i = buffer.length - 1; i >= 0; i--) {
+                var alphaIndex = alphabet.indexOf(buffer[i]);
+                if (alphaIndex < 0) {
+                    throw "Invalid character";
+                }
+                bi = bi.add(BigInteger.valueOf(alphaIndex).multiply(base.pow(buffer.length - 1 - i)));
+
+                if (buffer[i] == "1") leadingZerosNum++;
+                else leadingZerosNum = 0;
+            }
+
+            var bytes = bi.toByteArrayUnsigned();
+            while (leadingZerosNum-- > 0) bytes.unshift(0);
+            return bytes;
+        }
+
+        /* raw ajax function to avoid needing bigger frame works like jquery, mootools etc */
+        coinjs.ajax = function(u, f, m, a) {
+            var x = false;
+            try {
+                x = new ActiveXObject('Msxml2.XMLHTTP')
+            } catch (e) {
+                try {
+                    x = new ActiveXObject('Microsoft.XMLHTTP')
+                } catch (e) {
+                    x = new XMLHttpRequest()
+                }
+            }
+
+            if (x == false) {
+                return false;
+            }
+
+            x.open(m, u, true);
+            x.onreadystatechange = function() {
+                if ((x.readyState == 4) && f)
+                    f(x.responseText);
+            };
+
+            if (m == 'POST') {
+                x.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
+            }
+
+            x.send(a);
+        }
+
+        /* clone an object */
+        coinjs.clone = function(obj) {
+            if (obj == null || typeof(obj) != 'object') return obj;
+            var temp = new obj.constructor();
+
+            for (var key in obj) {
+                if (obj.hasOwnProperty(key)) {
+                    temp[key] = coinjs.clone(obj[key]);
+                }
+            }
+            return temp;
+        }
+
+        coinjs.numToBytes = function(num, bytes) {
+            if (typeof bytes === "undefined") bytes = 8;
+            if (bytes == 0) {
+                return [];
+            } else if (num == -1) {
+                return Crypto.util.hexToBytes("ffffffffffffffff");
+            } else {
+                return [num % 256].concat(coinjs.numToBytes(Math.floor(num / 256), bytes - 1));
+            }
+        }
+
+        function scriptNumSize(i) {
+            return i > 0x7fffffff ? 5 :
+                i > 0x7fffff ? 4 :
+                i > 0x7fff ? 3 :
+                i > 0x7f ? 2 :
+                i > 0x00 ? 1 :
+                0;
+        }
+
+        coinjs.numToScriptNumBytes = function(_number) {
+            var value = Math.abs(_number);
+            var size = scriptNumSize(value);
+            var result = [];
+            for (var i = 0; i < size; ++i) {
+                result.push(0);
+            }
+            var negative = _number < 0;
+            for (i = 0; i < size; ++i) {
+                result[i] = value & 0xff;
+                value = Math.floor(value / 256);
+            }
+            if (negative) {
+                result[size - 1] |= 0x80;
+            }
+            return result;
+        }
+
+        coinjs.numToVarInt = function(num) {
+            if (num < 253) {
+                return [num];
+            } else if (num < 65536) {
+                return [253].concat(coinjs.numToBytes(num, 2));
+            } else if (num < 4294967296) {
+                return [254].concat(coinjs.numToBytes(num, 4));
+            } else {
+                return [255].concat(coinjs.numToBytes(num, 8));
+            }
+        }
+
+        coinjs.bytesToNum = function(bytes) {
+            if (bytes.length == 0) return 0;
+            else return bytes[0] + 256 * coinjs.bytesToNum(bytes.slice(1));
+        }
+
+        coinjs.uint = function(f, size) {
+            if (f.length < size)
+                throw new Error("not enough data");
+            var n = 0;
+            for (var i = 0; i < size; i++) {
+                n *= 256;
+                n += f[i];
+            }
+            return n;
+        }
+
+        coinjs.isArray = function(o) {
+            return Object.prototype.toString.call(o) === '[object Array]';
+        }
+
+        coinjs.countObject = function(obj) {
+            var count = 0;
+            var i;
+            for (i in obj) {
+                if (obj.hasOwnProperty(i)) {
+                    count++;
+                }
+            }
+            return count;
+        }
+
+        coinjs.random = function(length) {
+            var r = "";
+            var l = length || 25;
+            var chars = "!$%^&*()_+{}:@~?><|\./;'#][=-abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
+            for (x = 0; x < l; x++) {
+                r += chars.charAt(Math.floor(Math.random() * 62));
+            }
+            return r;
+        }
+
+    })();
+})(typeof global !== "undefined" ? global : window);
+
+(function(EXPORTS) { //btc_api v1.0.6
+    const btc_api = EXPORTS;
+
+    //This library uses API provided by chain.so (https://chain.so/)
+    const URL = "https://chain.so/api/v2/";
+
+    const fetch_api = btc_api.fetch = function(api) {
+        return new Promise((resolve, reject) => {
+            console.debug(URL + api);
+            fetch(URL + api).then(response => {
+                response.json()
+                    .then(result => result.status === "success" ? resolve(result) : reject(result))
+                    .catch(error => reject(error))
+            }).catch(error => reject(error))
+        })
+    };
+
+    const broadcast = btc_api.broadcast = rawtx => new Promise((resolve, reject) => {
+        $.ajax({
+            type: "POST",
+            url: URL + "send_tx/BTC/",
+            data: {
+                "tx_hex": rawtx
+            },
+            dataType: "json",
+            error: e => reject(e.responseJSON),
+            success: r => r.status === "success" ? resolve(r.data) : reject(r)
+        })
+    });
+
+    Object.defineProperties(btc_api, {
+        newKeys: {
+            get: () => {
+                let r = coinjs.newKeys();
+                r.segwitAddress = coinjs.segwitAddress(r.pubkey).address;
+                r.bech32Address = coinjs.bech32Address(r.pubkey).address;
+                return r;
+            }
+        },
+        pubkey: {
+            value: key => key.length >= 66 ? key : (key.length == 64 ? coinjs.newPubkey(key) : coinjs.wif2pubkey(key).pubkey)
+        },
+        address: {
+            value: (key, prefix = undefined) => coinjs.pubkey2address(btc_api.pubkey(key), prefix)
+        },
+        segwitAddress: {
+            value: key => coinjs.segwitAddress(btc_api.pubkey(key)).address
+        },
+        bech32Address: {
+            value: key => coinjs.bech32Address(btc_api.pubkey(key)).address
+        }
+    });
+
+    coinjs.compressed = true;
+
+    const verifyKey = btc_api.verifyKey = function(addr, key) {
+        if (!addr || !key)
+            return undefined;
+        switch (coinjs.addressDecode(addr).type) {
+            case "standard":
+                return btc_api.address(key) === addr;
+            case "multisig":
+                return btc_api.segwitAddress(key) === addr;
+            case "bech32":
+                return btc_api.bech32Address(key) === addr;
+            default:
+                return null;
+        }
+    }
+
+    const validateAddress = btc_api.validateAddress = function(addr) {
+        if (!addr)
+            return undefined;
+        let type = coinjs.addressDecode(addr).type;
+        if (["standard", "multisig", "bech32"].includes(type))
+            return type;
+        else
+            return false;
+    }
+
+    //convert from one blockchain to another blockchain (target version)
+    btc_api.convert = {};
+
+    btc_api.convert.wif = function(source_wif, target_version = coinjs.priv) {
+        let keyHex = decodeLegacy(source_wif).hex;
+        if (!keyHex || keyHex.length < 66 || !/01$/.test(keyHex))
+            return null;
+        else
+            return encodeLegacy(keyHex, target_version);
+    }
+
+    btc_api.convert.legacy2legacy = function(source_addr, target_version = coinjs.pub) {
+        let rawHex = decodeLegacy(source_addr).hex;
+        if (!rawHex)
+            return null;
+        else
+            return encodeLegacy(rawHex, target_version);
+    }
+
+    btc_api.convert.legacy2bech = function(source_addr, target_version = coinjs.bech32.version, target_hrp = coinjs.bech32.hrp) {
+        let rawHex = decodeLegacy(source_addr).hex;
+        if (!rawHex)
+            return null;
+        else
+            return encodeBech32(rawHex, target_version, target_hrp);
+    }
+
+    btc_api.convert.bech2bech = function(source_addr, target_version = coinjs.bech32.version, target_hrp = coinjs.bech32.hrp) {
+        let rawHex = decodeBech32(source_addr).hex;
+        if (!rawHex)
+            return null;
+        else
+            return encodeBech32(rawHex, target_version, target_hrp);
+    }
+
+    btc_api.convert.bech2legacy = function(source_addr, target_version = coinjs.pub) {
+        let rawHex = decodeBech32(source_addr).hex;
+        if (!rawHex)
+            return null;
+        else
+            return encodeLegacy(rawHex, target_version);
+    }
+
+    function decodeLegacy(source) {
+        var decode = coinjs.base58decode(source);
+        var raw = decode.slice(0, decode.length - 4),
+            checksum = decode.slice(decode.length - 4);
+        var hash = Crypto.SHA256(Crypto.SHA256(raw, {
+            asBytes: true
+        }), {
+            asBytes: true
+        });
+        if (hash[0] != checksum[0] || hash[1] != checksum[1] || hash[2] != checksum[2] || hash[3] != checksum[3])
+            return null;
+        let version = raw.shift();
+        return {
+            version: version,
+            hex: Crypto.util.bytesToHex(raw)
+        }
+    }
+
+    function encodeLegacy(hex, version) {
+        var bytes = Crypto.util.hexToBytes(hex);
+        bytes.unshift(version);
+        var hash = Crypto.SHA256(Crypto.SHA256(bytes, {
+            asBytes: true
+        }), {
+            asBytes: true
+        });
+        var checksum = hash.slice(0, 4);
+        return coinjs.base58encode(bytes.concat(checksum));
+    }
+
+    function decodeBech32(source) {
+        let decode = coinjs.bech32_decode(source);
+        if (!decode)
+            return null;
+        var raw = decode.data;
+        let version = raw.shift();
+        raw = coinjs.bech32_convert(raw, 5, 8, false);
+        return {
+            hrp: decode.hrp,
+            version: version,
+            hex: Crypto.util.bytesToHex(raw)
+        }
+    }
+
+    function encodeBech32(hex, version, hrp) {
+        var bytes = Crypto.util.hexToBytes(hex);
+        bytes = coinjs.bech32_convert(bytes, 8, 5, true);
+        bytes.unshift(version)
+        return coinjs.bech32_encode(hrp, bytes);
+    }
+
+    btc_api.getBalance = addr => new Promise((resolve, reject) => {
+        fetch_api(`get_address_balance/BTC/${addr}`)
+            .then(result => resolve(parseFloat(result.data.confirmed_balance)))
+            .catch(error => reject(error))
+    });
+
+    function _redeemScript(addr, key) {
+        let decode = coinjs.addressDecode(addr);
+        switch (decode.type) {
+            case "standard":
+                return false;
+            case "multisig":
+                return coinjs.segwitAddress(btc_api.pubkey(key)).redeemscript;
+            case "bech32":
+                return decode.redeemscript;
+            default:
+                return null;
+        }
+    }
+
+    function addUTXOs(tx, senders, redeemScripts, required_amount, n = 0) {
+        return new Promise((resolve, reject) => {
+            required_amount = parseFloat(required_amount.toFixed(8));
+            if (required_amount <= 0 || n >= senders.length)
+                return resolve(required_amount);
+            let addr = senders[n],
+                rs = redeemScripts[n];
+            fetch_api(`get_tx_unspent/BTC/${addr}`).then(result => {
+                let utxos = result.data.txs;
+                console.debug("add-utxo", addr, rs, required_amount, utxos);
+                for (let i = 0; i < utxos.length && required_amount > 0; i++) {
+                    if (!utxos[i].confirmations) //ignore unconfirmed utxo
+                        continue;
+                    required_amount -= parseFloat(utxos[i].value);
+                    var script;
+                    if (rs) { //redeemScript for segwit/bech32
+                        let s = coinjs.script();
+                        s.writeBytes(Crypto.util.hexToBytes(rs));
+                        s.writeOp(0);
+                        s.writeBytes(coinjs.numToBytes((utxos[i].value * 100000000).toFixed(0), 8));
+                        script = Crypto.util.bytesToHex(s.buffer);
+                    } else //legacy script
+                        script = utxos[i].script_hex;
+                    tx.addinput(utxos[i].txid, utxos[i].output_no, script, 0xfffffffd /*sequence*/ ); //0xfffffffd for Replace-by-fee
+                }
+                addUTXOs(tx, senders, redeemScripts, required_amount, n + 1)
+                    .then(result => resolve(result))
+                    .catch(error => reject(error))
+            }).catch(error => reject(error))
+        })
+    }
+
+    btc_api.sendTx = function(senders, privkeys, receivers, amounts, fee, change_addr = null) {
+        return new Promise((resolve, reject) => {
+            //Add values into array (if single values are passed)
+            if (!Array.isArray(senders))
+                senders = [senders];
+            if (!Array.isArray(privkeys))
+                privkeys = [privkeys];
+            if (!Array.isArray(receivers))
+                receivers = [receivers];
+            if (!Array.isArray(amounts))
+                amounts = [amounts];
+
+            let invalids = [];
+            //validate tx-input parameters
+            if (senders.length != privkeys.length)
+                return reject("Array length for senders and privkeys should be equal");
+            const redeemScripts = [],
+                wif_keys = [];
+            for (let i in senders) {
+                if (!verifyKey(senders[i], privkeys[i])) //verify private-key
+                    invalids.push(senders[i]);
+                if (privkeys[i].length === 64) //convert Hex to WIF if needed
+                    privkeys[i] = coinjs.privkey2wif(privkeys[i]);
+                let rs = _redeemScript(senders[i], privkeys[i]); //get redeem-script (segwit/bech32)
+                redeemScripts.push(rs);
+                rs === false ? wif_keys.unshift(privkeys[i]) : wif_keys.push(privkeys[i]); //sorting private-keys (wif)
+            }
+            if (invalids.length)
+                return reject("Invalid keys:" + invalids);
+            if (typeof fee !== "number" || fee <= 0)
+                return reject("Invalid fee:" + fee);
+
+            //validate tx-output parameters
+            if (receivers.length != amounts.length)
+                return reject("Array length for receivers and amounts should be equal");
+            let total_amount = 0;
+            for (let i in receivers)
+                if (!validateAddress(receivers[i]))
+                    invalids.push(receivers[i]);
+            if (invalids.length)
+                return reject("Invalid receivers:" + invalids);
+            for (let i in amounts) {
+                if (typeof amounts[i] !== "number" || amounts[i] <= 0)
+                    invalids.push(amounts[i]);
+                else
+                    total_amount += amounts[i];
+            }
+            if (invalids.length)
+                return reject("Invalid amounts:" + invalids);
+            if (change_addr && !validateAddress(change_addr))
+                return reject("Invalid change_address:" + change_addr);
+
+            //create transaction
+            var tx = coinjs.transaction();
+            total_amount = parseFloat(total_amount.toFixed(8));
+            addUTXOs(tx, senders, redeemScripts, total_amount + fee).then(result => {
+                if (result > 0)
+                    return reject("Insufficient Balance");
+                for (let i in receivers)
+                    tx.addoutput(receivers[i], amounts[i]);
+                let change = parseFloat(Math.abs(result).toFixed(8));
+                if (change > 0)
+                    tx.addoutput(change_addr || senders[0], change);
+                console.debug("amounts (total, fee, change):", total_amount, fee, change);
+                console.debug("Unsigned:", tx.serialize());
+                new Set(wif_keys).forEach(key => console.debug("Signing key:", key, tx.sign(key, 1 /*sighashtype*/ ))); //Sign the tx using private key WIF
+
+                console.debug("Signed:", tx.serialize());
+                debugger;
+                broadcast(tx.serialize())
+                    .then(result => resolve(result))
+                    .catch(error => reject(error));
+            }).catch(error => reject(error))
+        })
+    };
+
+    btc_api.getTx = txid => new Promise((resolve, reject) => {
+        fetch_api(`get_tx/BTC/${txid}`)
+            .then(result => resolve(result.data))
+            .catch(error => reject(error))
+    });
+
+    btc_api.getAddressData = addr => new Promise((resolve, reject) => {
+        fetch_api(`address/BTC/${addr}`)
+            .then(result => resolve(result.data))
+            .catch(error => reject(error))
+    });
+
+    btc_api.getBlock = block => new Promise((resolve, reject) => {
+        fetch_api(`get_block/BTC/${block}`)
+            .then(result => resolve(result.data))
+            .catch(error => reject(error))
+    });
+
+})('object' === typeof module ? module.exports : window.btc_api = {});
\ No newline at end of file