Client-side Bitcoin JavaScript library
npm install altcoin-jsA javascript Bitcoin library for node.js and browsers. Written in TypeScript, but committing the JS files to verify.
Released under the terms of the MIT LICENSE.
We recommend every user of this library and the bitcoinjs ecosystem audit and verify any underlying code for its validity and suitability, including reviewing any and all of your project's dependencies.
Mistakes and bugs happen, but with your help in resolving and reporting issues, together we can produce open source software that is:
- Easy to audit and verify,
- Tested, with test coverage >95%,
- Advanced and feature rich,
- Standardized, using prettier and Node Buffer's throughout, and
- Friendly, with a strong and helpful community, ready to answer questions.
You can find a Web UI that covers most of the psbt.ts, transaction.ts and p2*.ts APIs here.
bash
npm install bitcoinjs-lib
optionally, install a key derivation library as well
npm install ecpair bip32
ecpair is the ECPair class for single keys
bip32 is for generating HD keys
`Previous versions of the library included classes for key management (ECPair, HDNode(->"bip32")) but now these have been separated into different libraries. This lowers the bundle size significantly if you don't need to perform any crypto functions (converting private to public keys and deriving HD keys).
Typically we support the Node Maintenance LTS version. TypeScript target will be set
to the ECMAScript version in which all features are fully supported by current Active Node LTS.
However, depending on adoption among other environments (browsers etc.) we may keep the target back a year or two.
If in doubt, see the main_ci.yml for what versions are used by our continuous integration tests.
WARNING: We presently don't provide any tooling to verify that the release on
matches GitHub. As such, you should verify anything downloaded by npm against your own verified copy.
Usage
Crypto is hard.When working with private keys, the random number generator is fundamentally one of the most important parts of any software you write.
For random number generation, we default to the
randombytes module, which uses window.crypto.getRandomValues in the browser, or Node js' crypto.randomBytes, depending on your build system.
Although this default is ~OK, there is no simple way to detect if the underlying RNG provided is good enough, or if it is catastrophically bad.
You should always verify this yourself to your own standards.This library uses tiny-secp256k1, which uses RFC6979 to help prevent
k re-use and exploitation.
Unfortunately, this isn't a silver bullet.
Often, Javascript itself is working against us by bypassing these counter-measures.Buffer (UInt8Array), for example, can trivially result in catastrophic fund loss without any warning.
It can do this through undermining your random number generation, accidentally producing a duplicate k value, sending Bitcoin to a malformed output script, or any of a million different ways.
Running tests in your target environment is important and a recommended step to verify continuously.Finally, adhere to best practice.
We are not an authoritative source of best practice, but, at the very least:
* Don't reuse addresses.
* Don't share BIP32 extended public keys ('xpubs'). They are a liability, and it only takes 1 misplaced private key (or a buggy implementation!) and you are vulnerable to catastrophic fund loss.
* Don't use
Math.random - in any way - don't.
* Enforce that users always verify (manually) a freshly-decoded human-readable version of their intended transaction before broadcast.
Don't ask* users to generate mnemonics, or 'brain wallets', humans are terrible random number generators.
* Lastly, if you can, use Typescript or similar.
$3
The recommended method of using bitcoinjs-lib in your browser is through browserify.If you'd like to use a different (more modern) build tool than
browserify, you can compile just this library and its dependencies into a single JavaScript file:`sh
$ npm install bitcoinjs-lib browserify
$ npx browserify --standalone bitcoin - -o bitcoinjs-lib.js <<<"module.exports = require('bitcoinjs-lib');"
`Which you can then import as an ESM module:
javascript
``NOTE: We use Node Maintenance LTS features, if you need strict ES5, use
in conjunction with your browserify step (using an es2015 preset).WARNING: iOS devices have problems, use at least buffer@5.0.5 or greater, and enforce the test suites (for
Buffer, and any other dependency) pass before use.$3
Type declarations for Typescript are included in this library. Normal installation should include all the needed type information.Examples
The below examples are implemented as integration tests, they should be very easy to understand.
Otherwise, pull requests are appreciated.
Some examples interact (via HTTPS) with a 3rd Party Blockchain Provider (3PBP).
- Taproot Key Spend
- Generate a random address
- Import an address via WIF
- Generate a 2-of-3 P2SH multisig address
- Generate a SegWit address
- Generate a SegWit P2SH address
- Generate a SegWit 3-of-4 multisig address
- Generate a SegWit 2-of-2 P2SH multisig address
- Support the retrieval of transactions for an address (3rd party blockchain)
- Generate a Testnet address
- Generate a Litecoin address
- Create a 1-to-1 Transaction
- Create (and broadcast via 3PBP) a typical Transaction
- Create (and broadcast via 3PBP) a Transaction with an OP\_RETURN output
- Create (and broadcast via 3PBP) a Transaction with a 2-of-4 P2SH(multisig) input
- Create (and broadcast via 3PBP) a Transaction with a SegWit P2SH(P2WPKH) input
- Create (and broadcast via 3PBP) a Transaction with a SegWit P2WPKH input
- Create (and broadcast via 3PBP) a Transaction with a SegWit P2PK input
- Create (and broadcast via 3PBP) a Transaction with a SegWit 3-of-4 P2SH(P2WSH(multisig)) input
- Create (and broadcast via 3PBP) a Transaction and sign with an HDSigner interface (bip32)
- Import a BIP32 testnet xpriv and export to WIF
- Export a BIP32 xpriv, then import it
- Export a BIP32 xpub
- Create a BIP32, bitcoin, account 0, external address
- Create a BIP44, bitcoin, account 0, external address
- Create a BIP49, bitcoin testnet, account 0, external address
- Use BIP39 to generate BIP32 addresses
- Create (and broadcast via 3PBP) a Transaction where Alice can redeem the output after the expiry (in the past)
- Create (and broadcast via 3PBP) a Transaction where Alice can redeem the output after the expiry (in the future)
- Create (and broadcast via 3PBP) a Transaction where Alice and Bob can redeem the output at any time
- Create (but fail to broadcast via 3PBP) a Transaction where Alice attempts to redeem before the expiry
- Create (and broadcast via 3PBP) a Transaction where Alice can redeem the output after the expiry (in the future) (simple CHECKSEQUENCEVERIFY)
- Create (but fail to broadcast via 3PBP) a Transaction where Alice attempts to redeem before the expiry (simple CHECKSEQUENCEVERIFY)
- Create (and broadcast via 3PBP) a Transaction where Bob and Charles can send (complex CHECKSEQUENCEVERIFY)
- Create (and broadcast via 3PBP) a Transaction where Alice (mediator) and Bob can send after 2 blocks (complex CHECKSEQUENCEVERIFY)
- Create (and broadcast via 3PBP) a Transaction where Alice (mediator) can send after 5 blocks (complex CHECKSEQUENCEVERIFY)
If you have a use case that you feel could be listed here, please ask for it!
Contributing
See CONTRIBUTING.md.
$3
` bash
npm test
npm run-script coverage
``