Transaction building uses the TxBuilder class. This class allows modification of the version and locktime. It also allows addition of inputs and outputs via the addInput and addOutput methods.

A typical workflow for transaction building looks like:

Create the builder
Set the version
Set the locktime
Add inputs via their outpoint
Add outputs by specifying a value in Bitcoin and including a locking script
Sign your inputs and assign the signature to corresponding input's ScriptSig

A simple example looks like:

// here are some dummy values that are needed
const privA; // 32-byte private key
const pubkeyA; // 33-byte compressed public key
const pubkeyhashB; // 20-byte hash of B's public key

// construct a builder
const txb = new TxBuilder();

// attach a single input that has 50 bitcoin in it
txb.addInput("9d0e63ad73020a9fad0106b6727e31d36e3ab4b9a01451233926d4759569de68:0");

// attach a spending output that pays to B's pubkeyhash
txb.addOutput(1, Script.p2pkhLock(pubkeyhashB));

// attach a change output that pays back to A's pubkey
txb.addOutput(48.9999, Script.p2pkhLock(pubkeyA));

// sign the input using the prior locking script
const commitScript = Script.p2pkhLock(pubkeyA);
const sig = txb.sign(0, commitScript, privA);

// create the scriptSig for the input that includes the signature and pubkey
// corresponding to the signature
txb.inputs[0].scriptSig = Script.p2pkhUnlock(sig, pubkeyA);

// convert the transaction into an immutable transaction
const tx = tx.toTx();

Legacy

Special Transactions

Native P2WPKH

P2SH-P2WPKH

Native P2WSH

P2SH-P2WSH

Keywords

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Package last updated on 18 Feb 2021

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Install

@node-lightning/bitcoin