@okxweb3/coin-bitcoin/dist/cat20/utils/prevTx.js

@ok/coin-bitcoin is a Bitcoin SDK for building Web3 wallets and applications. It supports BTC, BSV, DOGE, LTC, and TBTC, enabling private key management, transaction signing, address generation, and inscriptions like BRC-20, Runes, CAT, and Atomicals.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.validatePrevTx = void 0;
const common_1 = require("../common");
const utils_1 = require("./utils");
function validatePrevTx(metadata, prevTxHex, prevPrevTxHex, network) {
    let prevTokenInputIndex = 0;
    const prevTx = new common_1.btc.Transaction(prevTxHex);
    const input = prevTx.inputs.find((input, inputIndex) => {
        const witnesses = input.getWitnesses();
        if (Array.isArray(witnesses) && witnesses.length > 2) {
            const lockingScriptBuffer = witnesses[witnesses.length - 2];
            const { p2tr } = (0, utils_1.script2P2TR)(lockingScriptBuffer);
            const address = (0, utils_1.p2tr2Address)(p2tr, network);
            if (address === metadata.tokenAddr ||
                address === metadata.minterAddr) {
                prevTokenInputIndex = inputIndex;
                return true;
            }
        }
    });
    if (!input) {
        return null;
    }
    const prevPrevTxId = prevTx.inputs[prevTokenInputIndex].prevTxId.toString('hex');
    const prevPrevTx = new common_1.btc.Transaction(prevPrevTxHex);
    if (prevPrevTx.id != prevPrevTxId) {
        return null;
    }
    return {
        prevTx,
        prevPrevTx,
        prevTokenInputIndex,
    };
}
exports.validatePrevTx = validatePrevTx;
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