From e36f78f6bfc9c7a0953a3ff167a1c6f34489838a Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Thu, 12 Jan 2017 12:41:04 -0800
Subject: [PATCH] coin: add rhash method.

---
 lib/primitives/coin.js | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/lib/primitives/coin.js b/lib/primitives/coin.js
index 480f54c9..25074add 100644
--- a/lib/primitives/coin.js
+++ b/lib/primitives/coin.js
@@ -64,8 +64,8 @@ Coin.prototype.fromOptions = function fromOptions(options) {
   assert(util.isNumber(options.height));
   assert(util.isNumber(options.value));
   assert(typeof options.coinbase === 'boolean');
-  assert(options.hash == null || typeof options.hash === 'string');
-  assert(options.index == null || util.isNumber(options.index));
+  assert(typeof options.hash === 'string');
+  assert(util.isNumber(options.index));
 
   this.version = options.version;
   this.height = options.height;
@@ -147,6 +147,15 @@ Coin.fromKey = function fromKey(key) {
   return new Coin().fromKey(key);
 };
 
+/**
+ * Get little-endian hash.
+ * @returns {Hash}
+ */
+
+Coin.prototype.rhash = function rhash() {
+  return util.revHex(this.hash);
+};
+
 /**
  * Convert the coin to a more user-friendly object.
  * @returns {Object}
@@ -201,9 +210,7 @@ Coin.prototype.getJSON = function getJSON(network, minimal) {
     script: this.script.toJSON(),
     address: address,
     coinbase: this.coinbase,
-    hash: !minimal
-      ? (this.hash ? util.revHex(this.hash) : null)
-      : undefined,
+    hash: !minimal ? this.rhash() : undefined,
     index: !minimal ? this.index : undefined
   };
 };
@@ -228,8 +235,8 @@ Coin.prototype.fromJSON = function fromJSON(json) {
   this.value = Amount.value(json.value);
   this.script.fromJSON(json.script);
   this.coinbase = json.coinbase;
-  this.hash = json.hash ? util.revHex(json.hash) : null;
-  this.index = json.index != null ? json.index : -1;
+  this.hash = json.hash ? util.revHex(json.hash) : encoding.NULL_HASH;
+  this.index = json.index != null ? json.index : 0;
 
   return this;
 };
@@ -374,8 +381,8 @@ Coin.fromTX = function fromTX(tx, index, height) {
 
 Coin.isCoin = function isCoin(obj) {
   return obj
-    && obj.version !== undefined
-    && obj.script !== undefined
+    && typeof obj.version === 'number'
+    && typeof obj.script === 'object'
     && typeof obj.getDepth === 'function';
 };