Bitcore
=======

A pure, powerful core for your bitcoin project.

Bitcore is a complete, native interface to the Bitcoin network, and provides the core functionality needed to develop apps for bitcoin.

#Principles
Bitcoin is a powerful new peer-to-peer platform for the next generation of financial technology. The decentralized nature of the Bitcoin network allows for highly resilient bitcoin infrastructure, and the developer community needs reliable, open-source tools to implement bitcoin apps and services.

**Bitcore unchains developers from fallible, centralized APIs, and provides the tools to interact with the real Bitcoin network.**

#Get Started

Bitcore runs on [node](http://nodejs.org/), and can be installed via [npm](https://npmjs.org/):
```
npm install bitcore
```

It is a collection of objects useful to bitcoin applications; class-like idioms are enabled via [Classtool](https://github.com/gasteve/classtool). In most cases, a developer will require the object's class directly:
```
var Address = require('bitcore/Address').class();
```

#Examples

Some examples are provided at the [examples](/examples) path. Here are some snippets:

## Address handling
Validating a Bitcoin address:
```
var Address = require('bitcore/Address').class();
var addr = new Address("1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa");

try {
  addr.validate();
  console.log("Address is valid.");
} catch(e) {
  console.log(addr.data + " is not a valid address. " + e);
}
```

## Monitoring Blocks and Transactions
```
var networks    = require('bitcore/networks');
var Peer        = require('bitcore/Peer').class();
var PeerManager = require('bitcore/PeerManager').createClass({
  network: networks.livenet
});

var handleBlock = function(b) {
  console.log('block received:', b);
};
var handleTx = function(b) {
  console.log('block tx:', b);
};
var peerman = new PeerManager();
peerman.addPeer( new Peer('62.75.216.13',8333) );
peerman.addPeer( new Peer('62.75.253.91',8333) );
peerman.on('connection', function(conn) {
  conn.on('block', handleBlock);
  conn.on('tx', handleTx);
});
peerman.start();
```

PeerManager will emit the following events: 'version', 'verack', 'addr', 'getaddr', 'error' 'disconnect'; and will relay events like: 'tx', 'block', 'inv'. Please see  [PeerManager.js](PeerManager.js), [Peer.js](Peer.js) and [Connection.js](Connection.js)


## Create and send a Transaction thought P2P
```
var networks    = require('bitcore/networks');
var Peer        = require('bitcore/Peer').class();
var Transaction = require('bitcore/Transaction').class();
var Address     = require('bitcore/Address').class();
var Script      = require('bitcore/Script').class();
var coinUtil    = require('bitcore/util/util');
var PeerManager = require('bitcore/PeerManager').createClass({
  network: networks.testnet
});

var createTx = function() {
  var TXIN='d05f35e0bbc495f6dcab03e599c8f5e32a07cdb4bc76964de201d06a2a7d8265';
  var TXIN_N=0;
  var ADDR='muHct3YZ9Nd5Pq7uLYYhXRAxeW4EnpcaLz';
  var VAL='1.234';
  var txobj = {};
  txobj.version = 1;
  txobj.lock_time = 0;
  txobj.ins = [];
  txobj.outs = [];
  var txin = {};
  txin.s = coinUtil.EMPTY_BUFFER;   //Add signature
  txin.q = 0xffffffff;

  var hash = new Buffer(TXIN, 'hex');
  hash.reverse();
  var vout = parseInt(TXIN_N);
  var voutBuf = new Buffer(4);
  voutBuf.writeUInt32LE(vout, 0);
  txin.o = Buffer.concat([hash, voutBuf]);
  txobj.ins.push(txin);

  var addr = new Address(ADDR);
  var script = Script.createPubKeyHashOut(addr.payload());
  var valueNum = coinUtil.parseValue(VAL);
  var value = coinUtil.bigIntToValue(valueNum);

  var txout = {
    v: value,
    s: script.getBuffer(),
  };
  txobj.outs.push(txout);

  return new Transaction(txobj);
};

var peerman = new PeerManager();
peerman.addPeer( new Peer('127.0.0.1',18333) );
peerman.on('connect', function(conn) {
  var conn = peerman.getActiveConnection();
  if (conn)
    conn.sendTx(createTx());
  conn.on('reject', function () { console.log('Transaction Rejected'); } );
});
peerman.start();
```

## RPC Client
```
var RpcClient = require('../RpcClient').class();
var config =  {   
   protocol:  'http',
   user:  'user',
   pass:  'pass',
   host:  '127.0.0.1',
   port:  '18332',
};
var rpc   = new RpcClient(config);
rpc.getBlock( hash,  function(err, ret) {
  console.log(err);
  console.log(util.inspect(ret, { depth: 10} ));
});
```
Check the list of all supported RPC call at [RpcClient.js](RpcClient.js)

## Script Parsing

Gets an address strings from a  ScriptPubKey Buffer

```
  var Address = require('bitcore/Address').class();
  var coinUtil= require('bitcore/util/util');

  var getAddrStr = function(s) {
    var addrStrs = [];
    var type = s.classify();
    var addr;

    switch (type) {
      case Script.TX_PUBKEY:
        var chunk = s.captureOne();
        addr = new Address(network.addressPubkey, coinUtil.sha256ripe160(chunk));
        addrStrs.push(addr.toString());
        break;
      case Script.TX_PUBKEYHASH:
        addr = new Address(network.addressPubkey, s.captureOne());
        addrStrs.push(addr.toString());
        break;
      case Script.TX_SCRIPTHASH:
        addr = new Address(network.addressScript, s.captureOne());
        addrStrs.push(addr.toString());
        break;
      case Script.TX_MULTISIG:
        var chunks = s.capture();
        chunks.forEach(function(chunk) {
          var a = new Address(network.addressPubkey, coinUtil.sha256ripe160(chunk));
          addrStrs.push(a.toString());
        });
        break;
      case Script.TX_UNKNOWN:
        break;
    }
    return addrStrs;
  };

  var s = new Script(scriptBuffer);
  console.log(getAddrStr(s);
  
```

#Security
Please use at your own risk.

Bitcore is still under heavy development and not quite ready for "drop-in" production use. If you find a security issue, please email security@bitcore.io.

#Contributing
Bitcore needs some developer love. Please send pull requests for bug fixes, code optimization, and ideas for improvement.

Work to enable Bitcore for use in the browser is ongoing. To build bitcore for the browser:
```
npm install -g grunt-cli
grunt browserify
```


#License

**Code released under [the MIT license](https://github.com/bitpay/bitcore/blob/master/LICENSE).**

Copyright 2013-2014 BitPay, Inc. Bitcore is a trademark maintained by BitPay, Inc.


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