diff --git a/lib/bcoin/address.js b/lib/bcoin/address.js
index 9ece5f43..93cb76ed 100644
--- a/lib/bcoin/address.js
+++ b/lib/bcoin/address.js
@@ -173,19 +173,25 @@ Address.prototype.fromBase58 = function fromBase58(data) {
   assert(type != null, 'Unknown address prefix.');
 
   if (data.length > 25) {
+    assert(network.address.witness[type], 'Non-witness address too long.');
     version = p.readU8();
-    assert(data.length === 27 || data.length === 39);
     assert(version >= 0 && version <= 16, 'Bad program version.');
     assert(p.readU8() === 0, 'Address version padding is non-zero.');
   } else {
+    assert(data.length === 25, 'Address too short.');
     version = -1;
-    assert(data.length === 25);
   }
 
-  if (data.length === 39)
-    hash = p.readBytes(32);
-  else
-    hash = p.readBytes(20);
+  hash = p.readBytes(p.left() - 4);
+
+  if (version === -1)
+    assert(hash.length === 20, 'Hash is the wrong size.');
+  else if (version === 0 && type === 'witnesspubkeyhash')
+    assert(hash.length === 20, 'Hash is the wrong size.');
+  else if (version === 0 && type === 'witnessscripthash')
+    assert(hash.length === 32, 'Hash is the wrong size.');
+  else if (version === 1 && type === 'witnessscripthash')
+    assert(hash.length === 32, 'Hash is the wrong size.');
 
   p.verifyChecksum();
 
diff --git a/lib/bcoin/hd.js b/lib/bcoin/hd.js
index 0f57be06..2d5a98d0 100644
--- a/lib/bcoin/hd.js
+++ b/lib/bcoin/hd.js
@@ -283,8 +283,8 @@ Mnemonic.prototype.fromPhrase = function fromPhrase(phrase) {
   for (i = 0; i < cbits; i++) {
     bit = i % 8;
     oct = (i - bit) / 8;
-    b = (chk[oct] >>> (7 - bit)) & 1;
-    j = (ent[oct] >>> (7 - bit)) & 1;
+    b = (ent[oct] >>> (7 - bit)) & 1;
+    j = (chk[oct] >>> (7 - bit)) & 1;
     if (b !== j)
       throw new Error('Invalid checksum.');
   }
diff --git a/lib/bcoin/protocol/network.js b/lib/bcoin/protocol/network.js
index ef3060d7..3fa974a7 100644
--- a/lib/bcoin/protocol/network.js
+++ b/lib/bcoin/protocol/network.js
@@ -380,13 +380,13 @@ main.address = {
   },
 
   /**
-   * {@link Base58Address} versions.
+   * {@link Base58Address} witness types.
    * @enum {Number}
    */
 
-  versions: {
-    witnesspubkeyhash: 0,
-    witnessscripthash: 0
+  witness: {
+    witnesspubkeyhash: true,
+    witnessscripthash: true
   }
 };
 
@@ -398,14 +398,6 @@ main.address = {
 
 main.address.prefixesByVal = utils.revMap(main.address.prefixes);
 
-/**
- * {@link Base58Address} versions by value.
- * @type {RevMap}
- * @default
- */
-
-main.address.versionsByVal = utils.revMap(main.address.versions);
-
 /**
  * Default value for whether the mempool
  * accepts non-standard transactions.
@@ -598,14 +590,13 @@ testnet.address = {
     witnesspubkeyhash: 3,
     witnessscripthash: 40
   },
-  versions: {
-    witnesspubkeyhash: 0,
-    witnessscripthash: 0
+  witness: {
+    witnesspubkeyhash: true,
+    witnessscripthash: true
   }
 };
 
 testnet.address.prefixesByVal = utils.revMap(testnet.address.prefixes);
-testnet.address.versionsByVal = utils.revMap(testnet.address.versions);
 
 testnet.requireStandard = false;
 
@@ -745,14 +736,13 @@ regtest.address = {
     witnesspubkeyhash: 3,
     witnessscripthash: 40
   },
-  versions: {
-    witnesspubkeyhash: 0,
-    witnessscripthash: 0
+  witness: {
+    witnesspubkeyhash: true,
+    witnessscripthash: true
   }
 };
 
 regtest.address.prefixesByVal = utils.revMap(regtest.address.prefixes);
-regtest.address.versionsByVal = utils.revMap(regtest.address.versions);
 
 regtest.requireStandard = false;
 
@@ -876,14 +866,13 @@ segnet3.address = {
     witnesspubkeyhash: 3,
     witnessscripthash: 40
   },
-  versions: {
-    witnesspubkeyhash: 0,
-    witnessscripthash: 0
+  witness: {
+    witnesspubkeyhash: true,
+    witnessscripthash: true
   }
 };
 
 segnet3.address.prefixesByVal = utils.revMap(segnet3.address.prefixes);
-segnet3.address.versionsByVal = utils.revMap(segnet3.address.versions);
 
 segnet3.requireStandard = false;
 
@@ -1022,14 +1011,13 @@ segnet4.address = {
     witnesspubkeyhash: 3,
     witnessscripthash: 40
   },
-  versions: {
-    witnesspubkeyhash: 0,
-    witnessscripthash: 0
+  witness: {
+    witnesspubkeyhash: true,
+    witnessscripthash: true
   }
 };
 
 segnet4.address.prefixesByVal = utils.revMap(segnet4.address.prefixes);
-segnet4.address.versionsByVal = utils.revMap(segnet4.address.versions);
 
 segnet4.requireStandard = false;