Add PoS coins (e.g. Peercoin) support

src/block.js

@@ -13,7 +13,7 @@ function Block () {
   this.nonce = 0
 }
 
-Block.fromBuffer = function (buffer) {
+Block.fromBuffer = function (buffer, network) {
   assert(buffer.length >= 80, 'Buffer too small (< 80 bytes)')
 
   var offset = 0
@@ -46,7 +46,7 @@ Block.fromBuffer = function (buffer) {
 
   // FIXME: poor performance
   function readTransaction () {
-    var tx = Transaction.fromBuffer(buffer.slice(offset), true)
+    var tx = Transaction.fromBuffer(buffer.slice(offset), true, network)
 
     offset += tx.toBuffer().length
     return tx
@@ -60,11 +60,18 @@ Block.fromBuffer = function (buffer) {
     block.transactions.push(tx)
   }
 
+  // Read block signature (vchBlockSig) for PoS coins.
+  block.blockSig = null
+  if (offset < buffer.length) {
+    var blockSigSize = readVarInt()
+    block.blockSig = readSlice(blockSigSize)
+  }
+
   return block
 }
 
-Block.fromHex = function (hex) {
-  return Block.fromBuffer(new Buffer(hex, 'hex'))
+Block.fromHex = function (hex, network) {
+  return Block.fromBuffer(new Buffer(hex, 'hex'), network)
 }
 
 Block.prototype.getHash = function () {
@@ -110,7 +117,15 @@ Block.prototype.toBuffer = function (headersOnly) {
     return tx.toBuffer()
   })
 
-  return Buffer.concat([buffer, txLenBuffer].concat(txBuffers))
+  var ret = Buffer.concat([buffer, txLenBuffer].concat(txBuffers))
+
+  // Block Signature.
+  if (this.blockSig) {
+    var blockSigLenBuffer = bufferutils.varIntBuffer(this.blockSig.length)
+    ret = Buffer.concat([ret, blockSigLenBuffer, this.blockSig])
+  }
+
+  return ret
 }
 
 Block.prototype.toHex = function (headersOnly) {

src/networks.js

@@ -12,7 +12,8 @@ module.exports = {
     pubKeyHash: 0x00,
     scriptHash: 0x05,
     wif: 0x80,
-    dustThreshold: 546 // https://github.com/bitcoin/bitcoin/blob/v0.9.2/src/core.h#L151-L162
+    dustThreshold: 546, // https://github.com/bitcoin/bitcoin/blob/v0.9.2/src/core.h#L151-L162
+    isPoS: false
   },
   testnet: {
     magic: 0xd9b4bef9,
@@ -24,7 +25,8 @@ module.exports = {
     pubKeyHash: 0x6f,
     scriptHash: 0xc4,
     wif: 0xef,
-    dustThreshold: 546
+    dustThreshold: 546,
+    isPoS: false
   },
   litecoin: {
     magic: 0xd9b4bef9,
@@ -36,7 +38,8 @@ module.exports = {
     pubKeyHash: 0x30,
     scriptHash: 0x05,
     wif: 0xb0,
-    dustThreshold: 0 // https://github.com/litecoin-project/litecoin/blob/v0.8.7.2/src/main.cpp#L360-L365
+    dustThreshold: 0, // https://github.com/litecoin-project/litecoin/blob/v0.8.7.2/src/main.cpp#L360-L365
+    isPoS: false
   },
   dogecoin: {
     messagePrefix: '\x19Dogecoin Signed Message:\n',
@@ -47,6 +50,19 @@ module.exports = {
     pubKeyHash: 0x1e,
     scriptHash: 0x16,
     wif: 0x9e,
-    dustThreshold: 0 // https://github.com/dogecoin/dogecoin/blob/v1.7.1/src/core.h#L155-L160
+    dustThreshold: 0, // https://github.com/dogecoin/dogecoin/blob/v1.7.1/src/core.h#L155-L160
+    isPoS: false
+  },
+  peercoin: {
+    messagePrefix: '\x17PPcoin Signed Message:\n',
+    bip32: {
+      public: 0x01da950b,  // start with "Ppub..."
+      private: 0x01da90d0  // start with "Pprv..."
+    },
+    pubKeyHash: 0x37,
+    scriptHash: 0x75,
+    wif: 0xb7,
+    dustThreshold: 0,
+    isPoS: true
   }
 }

src/transaction.js

@@ -3,11 +3,14 @@ var bufferutils = require('./bufferutils')
 var crypto = require('./crypto')
 var typeForce = require('typeforce')
 var opcodes = require('./opcodes')
+var networks = require('./networks')
 
 var Script = require('./script')
 
-function Transaction () {
+function Transaction (network) {
+  this.network = network || networks.bitcoin
   this.version = 1
+  this.time = Math.floor(new Date().getTime() / 1000)
   this.locktime = 0
   this.ins = []
   this.outs = []
@@ -19,7 +22,8 @@ Transaction.SIGHASH_NONE = 0x02
 Transaction.SIGHASH_SINGLE = 0x03
 Transaction.SIGHASH_ANYONECANPAY = 0x80
 
-Transaction.fromBuffer = function (buffer, __disableAssert) {
+Transaction.fromBuffer = function (buffer, __disableAssert, network) {
+  network = network || networks.bitcoin
   var offset = 0
   function readSlice (n) {
     offset += n
@@ -52,8 +56,9 @@ Transaction.fromBuffer = function (buffer, __disableAssert) {
     return new Script(readSlice(readVarInt()), [])
   }
 
-  var tx = new Transaction()
+  var tx = new Transaction(network)
   tx.version = readUInt32()
+  if (network.isPoS) tx.time = readUInt32()
 
   var vinLen = readVarInt()
   for (var i = 0; i < vinLen; ++i) {
@@ -93,8 +98,8 @@ Transaction.fromBuffer = function (buffer, __disableAssert) {
   return tx
 }
 
-Transaction.fromHex = function (hex) {
-  return Transaction.fromBuffer(new Buffer(hex, 'hex'))
+Transaction.fromHex = function (hex, network) {
+  return Transaction.fromBuffer(new Buffer(hex, 'hex'), null, network)
 }
 
 Transaction.isCoinbaseHash = function (buffer) {
@@ -145,7 +150,7 @@ Transaction.prototype.byteLength = function () {
   }
 
   return (
-    8 +
+    (this.network.isPoS ? 12 : 8) +
     bufferutils.varIntSize(this.ins.length) +
     bufferutils.varIntSize(this.outs.length) +
     this.ins.reduce(function (sum, input) { return sum + 40 + scriptSize(input.script) }, 0) +
@@ -154,8 +159,9 @@ Transaction.prototype.byteLength = function () {
 }
 
 Transaction.prototype.clone = function () {
-  var newTx = new Transaction()
+  var newTx = new Transaction(this.network)
   newTx.version = this.version
+  newTx.time = this.time
   newTx.locktime = this.locktime
 
   newTx.ins = this.ins.map(function (txIn) {
@@ -295,6 +301,7 @@ Transaction.prototype.toBuffer = function () {
   }
 
   writeUInt32(this.version)
+  if (this.network.isPoS) writeUInt32(this.time)
   writeVarInt(this.ins.length)
 
   this.ins.forEach(function (txIn) {

src/transaction_builder.js

@@ -3,6 +3,7 @@ var bcrypto = require('./crypto')
 var bufferutils = require('./bufferutils')
 var ops = require('./opcodes')
 var scripts = require('./scripts')
+var networks = require('./networks')
 
 var Address = require('./address')
 var ECPair = require('./ecpair')
@@ -83,20 +84,22 @@ function extractInput (txIn) {
   }
 }
 
-function TransactionBuilder () {
+function TransactionBuilder (network) {
+  this.network = network || networks.bitcoin
   this.prevTxMap = {}
   this.prevOutScripts = {}
   this.prevOutTypes = {}
 
   this.inputs = []
-  this.tx = new Transaction()
+  this.tx = new Transaction(network)
 }
 
 TransactionBuilder.fromTransaction = function (transaction) {
-  var txb = new TransactionBuilder()
+  var txb = new TransactionBuilder(transaction.network)
 
   // Copy other transaction fields
   txb.tx.version = transaction.version
+  txb.tx.time = transaction.time
   txb.tx.locktime = transaction.locktime
 
   // Extract/add inputs

test/block.js

@@ -2,6 +2,7 @@
 
 var assert = require('assert')
 
+var networks = require('../src/networks')
 var Block = require('../src/block')
 
 var fixtures = require('./fixtures/block')
@@ -10,7 +11,7 @@ describe('Block', function () {
   describe('fromBuffer/fromHex', function () {
     fixtures.valid.forEach(function (f) {
       it('imports the block: ' + f.description + ' correctly', function () {
-        var block = Block.fromHex(f.hex)
+        var block = Block.fromHex(f.hex, networks[f.network])
 
         assert.strictEqual(block.version, f.version)
         assert.strictEqual(block.prevHash.toString('hex'), f.prevHash)
@@ -24,7 +25,7 @@ describe('Block', function () {
     fixtures.invalid.forEach(function (f) {
       it('throws on ' + f.exception, function () {
         assert.throws(function () {
-          Block.fromHex(f.hex)
+          Block.fromHex(f.hex, networks[f.network])
         }, new RegExp(f.exception))
       })
     })
@@ -35,7 +36,7 @@ describe('Block', function () {
       var block
 
       beforeEach(function () {
-        block = Block.fromHex(f.hex)
+        block = Block.fromHex(f.hex, networks[f.network])
       })
 
       it('exports the block: ' + f.description + ' correctly', function () {
@@ -49,7 +50,7 @@ describe('Block', function () {
       var block
 
       beforeEach(function () {
-        block = Block.fromHex(f.hex)
+        block = Block.fromHex(f.hex, networks[f.network])
       })
 
       it('calculates ' + f.hash + ' for the block: ' + f.description, function () {
@@ -63,7 +64,7 @@ describe('Block', function () {
       var block
 
       beforeEach(function () {
-        block = Block.fromHex(f.hex)
+        block = Block.fromHex(f.hex, networks[f.network])
       })
 
       it('calculates ' + f.id + ' for the block: ' + f.description, function () {
@@ -77,7 +78,7 @@ describe('Block', function () {
       var block
 
       beforeEach(function () {
-        block = Block.fromHex(f.hex)
+        block = Block.fromHex(f.hex, networks[f.network])
       })
 
       it('returns UTC date of ' + f.id, function () {

test/fixtures/block.json

@@ -2,6 +2,7 @@
   "valid": [
     {
       "description": "Coinbase only - Headers only",
+      "network": "bitcoin",
       "hash": "55388f8f9b326bd0b8e50fbe44c1903d4be14febcfad4dffa50c846c00000000",
       "id": "000000006c840ca5ff4dadcfeb4fe14b3d90c144be0fe5b8d06b329b8f8f3855",
       "version": 2,
@@ -14,6 +15,7 @@
     },
     {
       "description": "Coinbase only",
+      "network": "bitcoin",
       "hash": "55388f8f9b326bd0b8e50fbe44c1903d4be14febcfad4dffa50c846c00000000",
       "id": "000000006c840ca5ff4dadcfeb4fe14b3d90c144be0fe5b8d06b329b8f8f3855",
       "version": 2,
@@ -24,8 +26,22 @@
       "nonce": 3760981266,
       "hex": "020000003385c4b2a3499669987f5d04fa4127b59dbf2ee625694fa0bf08000000000000cf52f0ed6571367818a801a169e64030d8cab1a9f17e27170a6924127e19dbb8eba43e54ffff001d12052ce00101000000010000000000000000000000000000000000000000000000000000000000000000ffffffff2403089904174b6e434d696e65724251521defe5cdcf04ad543ea4eb0101000000165e0000ffffffff0100f90295000000001976a9149e8985f82bc4e0f753d0492aa8d11cc39925774088ac00000000"
     },
+    {
+      "description": "Coinbase only (PoS-type; Peercoin #1)",
+      "network": "peercoin",
+      "hash": "586629ff7567a5fbc5409eec427f7610755c51ba7150af24e0e40b0000000000",
+      "id": "00000000000be4e024af5071ba515c7510767f42ec9e40c5fba56775ff296658",
+      "version": 1,
+      "prevHash": "e327cd80c8b17efda4ea08c5877e95d877462ab66349d5667167fe3200000000",
+      "merkleRoot": "68f623d206a1bde3b0382e97af9c0b6bfa708ca4c25f339953e134ff4ee8da1b",
+      "timestamp": 1345400356,
+      "bits": 469827583,
+      "nonce": 1915373966,
+      "hex": "01000000e327cd80c8b17efda4ea08c5877e95d877462ab66349d5667167fe320000000068f623d206a1bde3b0382e97af9c0b6bfa708ca4c25f339953e134ff4ee8da1b242e3150ffff001c8e492a720101000000742c3150010000000000000000000000000000000000000000000000000000000000000000ffffffff0f04242e3150021a02062f503253482fffffffff017028ff9400000000232102e5d9735f12cc4adfce708445c9e109dc945a135377bddf6a6f856757c88eecb3ac0000000047304502210091c860f869ade3c1536a94c7f9e51ae72aa04380f6d22198320d733a5bea6ac5022035e4daaff5b11f4dbd93a02cc79d207cbe33199c1c05fde9df8822d92e5c20c1"
+    },
     {
       "description": "Low number of transactions",
+      "network": "bitcoin",
       "hash": "f0ca57cf84cc953194cd87de4bd9142720a056dc6f27484767f3e85e00000000",
       "id": "000000005ee8f3674748276fdc56a0202714d94bde87cd943195cc84cf57caf0",
       "version": 2,
@@ -38,6 +54,7 @@
     },
     {
       "description": "Medium number of transactions",
+      "network": "bitcoin",
       "hash": "0cccf0b884a20113ea2c53a381dacc92a68ae9db1cf86525eb259f0c00000000",
       "id": "000000000c9f25eb2565f81cdbe98aa692ccda81a3532cea1301a284b8f0cc0c",
       "version": 2,