@ledgerhq/hw-app-btc/lib-es/serializeTransaction.js

Ledger Hardware Wallet Bitcoin Application API

import { createVarint } from "./varint";
/**
  @example
const tx1 = btc.splitTransaction("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");
const outputScript = btc.serializeTransactionOutputs(tx1).toString('hex');
  */
export function serializeTransactionOutputs({ outputs }) {
    let outputBuffer = Buffer.alloc(0);
    if (typeof outputs !== "undefined") {
        outputBuffer = Buffer.concat([outputBuffer, createVarint(outputs.length)]);
        outputs.forEach(output => {
            outputBuffer = Buffer.concat([
                outputBuffer,
                output.amount,
                createVarint(output.script.length),
                output.script,
            ]);
        });
    }
    return outputBuffer;
}
export function serializeTransaction(transaction, skipWitness, timestamp, additionals = []) {
    const isDecred = additionals.includes("decred");
    const isZcash = additionals.includes("zcash");
    const isBech32 = additionals.includes("bech32");
    let inputBuffer = Buffer.alloc(0);
    const useWitness = typeof transaction["witness"] != "undefined" && !skipWitness;
    transaction.inputs.forEach(input => {
        inputBuffer =
            isDecred || isBech32
                ? Buffer.concat([
                    inputBuffer,
                    input.prevout,
                    Buffer.from([0x00]), //tree
                    input.sequence,
                ])
                : Buffer.concat([
                    inputBuffer,
                    input.prevout,
                    createVarint(input.script.length),
                    input.script,
                    input.sequence,
                ]);
    });
    let outputBuffer = serializeTransactionOutputs(transaction);
    if (typeof transaction.outputs !== "undefined" && typeof transaction.locktime !== "undefined") {
        outputBuffer = Buffer.concat([
            outputBuffer,
            (useWitness && transaction.witness) || Buffer.alloc(0),
            transaction.locktime,
            transaction.nExpiryHeight || Buffer.alloc(0),
            transaction.extraData || Buffer.alloc(0),
        ]);
    }
    // from to https://zips.z.cash/zip-0225, zcash is different with other coins, the lock_time and nExpiryHeight fields are before the inputs and outputs
    if (isZcash) {
        return Buffer.concat([
            transaction.version,
            transaction.nVersionGroupId || Buffer.alloc(0),
            transaction.consensusBranchId || Buffer.from([0x00, 0x00, 0x00, 0x00]),
            transaction.locktime || Buffer.from([0x00, 0x00, 0x00, 0x00]),
            transaction.nExpiryHeight || Buffer.from([0x00, 0x00, 0x00, 0x00]),
            useWitness ? Buffer.from("0001", "hex") : Buffer.alloc(0),
            createVarint(transaction.inputs.length),
            inputBuffer,
            outputBuffer,
        ]);
    }
    return Buffer.concat([
        transaction.version,
        timestamp ? timestamp : Buffer.alloc(0),
        transaction.nVersionGroupId || Buffer.alloc(0),
        useWitness ? Buffer.from("0001", "hex") : Buffer.alloc(0),
        createVarint(transaction.inputs.length),
        inputBuffer,
        outputBuffer,
    ]);
}
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