132 lines
4.2 KiB
Markdown
132 lines
4.2 KiB
Markdown
# bitcoinjs-lib
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[](https://travis-ci.org/bitcoinjs/bitcoinjs-lib)
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[](https://ci.testling.com/bitcoinjs/bitcoinjs-lib)
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A pure JavaScript Bitcoin library for node.js and browsers. Backed by (slowly improving) testing, proven by over a million wallet users. The backbone for almost all Bitcoin web wallets in production today.
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**Warning**: Master is not stable. Expect the interface to change rapidly, including some of the examples below. This is not the original bitcoinjs-lib that was not updated for a while. The current bitcoinjs-lib has been refactored to clean things up, add new functionality and merge improvements from the community. If you are looking for the original, it will be tagged as `0.1.3`. We will use `0.2.x` for releases based on these changes, so be sure to use the `0.1.3` tag if you need the original version.
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## Features
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- Bitcoin Testnet and Mainnet (production) support
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- [HD Wallets](https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki)
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- Highly secure random private key / address generation using [window.crypto.getRandomValues](https://developer.mozilla.org/en-US/docs/Web/API/Window.crypto)
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- ECDSA signing and verification
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- Transaction creation (pay-to-pubkey-hash), support for multisignature transactions
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- A (somewhat incomplete) wallet implementation, improvements ongoing
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## Installation
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`npm install bitcoinjs-lib`
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Note: The npm version is currently out of date, are working to resolve this. The best way to use the latest code is to clone the repository.
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## Setup
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### Node.js
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var bitcoin = require('bitcoinjs-lib')
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From the repo:
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var bitcoin = require('./src/index.js')
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### Browser
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Compile `bitcoinjs-min.js` with the following command:
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$ npm run-script compile
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After loading this file in your browser, you will be able to use the global `Bitcoin` object.
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## Usage
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These examples assume you are running bitcoinjs-lib in the browser.
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### Generating a Bitcoin address
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```javascript
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key = Bitcoin.ECKey()
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// Print your private key (used for signing transactions)
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console.log(key.toString())
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// => 5Jxfda2afuyMw3iaxzAwv6FvAs3XxmjV5y3GPAjZDEhRNJaFG5a
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// Print your public key (Bitcoin address)
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console.log(key.getPub().toString())
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// => 18oxCAnbuKHDjP7KzLBDj8mLjggDBjE1Q9
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```
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### Creating a Transaction
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```javascript
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tx = new Bitcoin.Transaction()
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// Add the input (the output of the previous transaction) of the form [previous transaction hash]:[index of the output to use]
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tx.addInput("aa94ab02c182214f090e99a0d57021caffd0f195a81c24602b1028b130b63e31:0")
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// Add the output (who to pay to) of the form [payee's bitcoin address]:[amount in satoshis]
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tx.addOutput("1Gokm82v6DmtwKEB8AiVhm82hyFSsEvBDK:15000")
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// Initialize the private key you created earlier so you can sign the transaction
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key = Bitcoin.ECKey("5Jxfda2afuyMw3iaxzAwv6FvAs3XxmjV5y3GPAjZDEhRNJaFG5a")
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// Sign the first input with your key
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tx.sign(0, key)
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// Print transaction serialized as hex. You can push the transaction onto the Bitcoin network manually
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// here: https://blockchain.info/pushtx
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console.log(tx.serializeHex())
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```
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## Projects utilizing bitcoinjs-lib
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- [Blockchain.info Wallet](http://blockchain.info/wallet)
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- [Bitaddress.org](https://www.bitaddress.org)
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- [Coinpunk](https://coinpunk.com)
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- [DarkWallet](https://darkwallet.unsystem.net)
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- [GreenAddress](https://greenaddress.it)
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Feel free to send pull requests to have your project/startup listed here.
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## Contributing
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### Instructions
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1. Fork the repo
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2. Push changes to your fork
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3. Create a pull request
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### Running the test suite
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$ npm test
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## Alternatives
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- [Bitcore](https://github.com/bitpay/bitcore)
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- [Cryptocoin](https://github.com/cryptocoinjs/cryptocoin)
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## License
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This library is free and open-source software released under the MIT license.
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## Copyright
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BitcoinJS (c) 2011-2012 Stefan Thomas
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Released under MIT license
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http://bitcoinjs.org/
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JSBN (c) 2003-2005 Tom Wu
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Released under BSD license
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http://www-cs-students.stanford.edu/~tjw/jsbn/
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CryptoJS (c) 2009–2012 by Jeff Mott
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Released under New BSD license
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http://code.google.com/p/crypto-js/
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