Bitcoinjs-lib: How to use Testnet

[jcrubino]

How can I use this lib to work with testnet?

[jprichardson]

As far as I know, it doesn't work with testnet. You'll want to use one of the forks: https://github.com/vbuterin/bitcoinjs-lib & https://github.com/kyledrake/bitcoinjs-lib or follow our effort over here: https://github.com/cryptocoinjs/cryptocoin

[jcrubino]

@jprichardson it should be as simple as changing the address prefix... need to verify that with others.

[jprichardson]

For generating testnet addresses, yes, just set an instance of Bitcoin.Address version field to 0x6f. That should do it.

[jprichardson]

I wrote http://procbits.com/2013/08/27/generating-a-bitcoin-address-with-javascript, scroll down to the part on Addresses.

edit: See below for up-to-date examples

[mixdev]

From the integration tests directory

var testnet = bitcoin.networks.testnet
var alice = bitcoin.ECPair.makeRandom({ network: testnet })
var bob = bitcoin.ECPair.makeRandom({ network: testnet })
var alicesAddress = alice.getAddress()
var bobsAddress = bob.getAddress()

[mixdev]

If you want to create the ECPair from a hash:

  var hash = bitcoin.crypto.sha256('correct horse battery staple')
  var d = bigi.fromBuffer(hash)
  var keyPair = bitcoin.ECPair(d, null, {network: bitcoin.networks.testnet});

[takahser]

@mixdev this doesn't work anymore, see https://github.com/bitcoinjs/bitcoinjs-lib/pull/1085 and changelog:

• Removed ECPair.prototype.getAddress, use payments.p2pkh instead (#1085)

However, payments.p2pkh doesn't return a testnet address (starting with m or n), but obviously a p2pkh address that isn't valid on the testnet address (correct me if I'm wrong). Is there still a way to get testnet addresses using bitcoinjs-lib?

[junderw]

pass network to p2pkh and all portions inside it.

[dcousens]

@junderw is the .network information on ECPair still useful?

[junderw]

with the new payments API, no... not really.

[dtaipov]

pass network to p2pkh and all portions inside it.

@junderw Could you suggest how to pass network to p2pkh? This code still returns mainnet address:
const { address } = bitcoin.payments.p2pkh({ pubkey }, {network: bitcoin.networks.testnet});

[junderw]

const { address } = bitcoin.payments.p2pkh({ pubkey, network: bitcoin.networks.testnet})

this works.

one arg, not two.

[pavoltravnik]

I had to pass it directly as a parameter
https://github.com/bitcoinjs/bitcoinjs-lib/issues/1259
let script = bitcoin.address.toOutputScript(address, bitcoin.networks.testnet);