Bitcoin Regtest Client

A library for managing regtest server. (Good for integration tests)

You must specify a server

Default URL is http://127.0.0.1:8080/1, and the recommended way to set up a server is to run a docker container locally.

You can override the URL with APIURL environment variable or by using the optional second arg new RegtestUtils(bitcoin, { APIURL: 'xxx' }) at runtime.

You can also override the API password (set on the server side) with APIPASS env variable, or new RegtestUtils(bitcoin, { APIURL: 'xxx', APIPASS: 'yyy' })

The optional second arg can have either, both, or none of the two overrides.

Docker

Check the docker folder on regtest-server to run a server locally.

Also, see bitcoinjs-lib travis config to see how to use the docker image with CI.
Check the .travis.yml here.

TypeScript support

Types are automatically generated. Develop in TypeScript, commit JS and types. Pull requests must all contain TS, JS, and types where needed.

Usage

// inside an async function to use await

// bitcoinjs-lib must be the >=5.0.6 to use.
// For bitcoinjs-lib >=4.0.3, use version v0.0.8 of regtest-client
const bitcoin = require('bitcoinjs-lib')
const { RegtestUtils } = require('regtest-client')
const regtestUtils = new RegtestUtils(bitcoin)

const network = regtestUtils.network // regtest network params

const keyPair = bitcoin.ECPair.makeRandom({ network })
const p2pkh = bitcoin.payments.p2pkh({ pubkey: keyPair.publicKey, network })

// Tell the server to send you coins (satoshis)
// Can pass address
const unspent = await regtestUtils.faucet(p2pkh.address, 2e4)

// Tell the server to send you coins (satoshis)
// Can pass Buffer of the scriptPubkey (in case address can not be parsed by bitcoinjs-lib)
// Non-standard outputs will be rejected, though.
const unspentComplex = await regtestUtils.faucetComplex(p2pkh.output, 1e4)

// Get all current unspents of the address.
const unspents = await regtestUtils.unspents(p2pkh.address)

// Get data of a certain transaction
const fetchedTx = await regtestUtils.fetch(unspent.txId)

// Mine 6 blocks, returns an Array of the block hashes
// All of the above faucet payments will confirm
const results = await regtestUtils.mine(6)

// Send our own transaction
const txb = new bitcoin.TransactionBuilder(network)
txb.addInput(unspent.txId, unspent.vout)
txb.addInput(unspentComplex.txId, unspentComplex.vout)
// regtestUtils.RANDOM_ADDRESS is created on first load.
// regtestUtils.randomAddress() will return a new random address every time.
// (You won't have the private key though.)
txb.addOutput(regtestUtils.RANDOM_ADDRESS, 1e4)

txb.sign({
  prevOutScriptType: 'p2pkh',
  vin: 0,
  keyPair,
})
txb.sign({
  prevOutScriptType: 'p2pkh',
  vin: 1,
  keyPair,
})
const tx = txb.build()

// build and broadcast to the Bitcoin Local RegTest server
await regtestUtils.broadcast(tx.toHex())

// This verifies that the vout output of txId transaction is actually for value
// in satoshis and is locked for the address given.
// The utxo can be unconfirmed. We are just verifying it was at least placed in
// the mempool.
await regtestUtils.verify({
  txId: tx.getId(),
  address: regtestUtils.RANDOM_ADDRESS,
  vout: 0,
  value: 1e4
})