@btc-vision/transaction/build/verification/TapscriptVerificator.js

OPNet transaction library allows you to create and sign transactions for the OPNet network.

import { concat, crypto as bitCrypto, equals, networks, opcodes, payments, script, toXOnly, } from '@btc-vision/bitcoin';
import { DeploymentGenerator } from '../generators/builders/DeploymentGenerator.js';
import { Features } from '../generators/Features.js';
export class TapscriptVerificator {
    static TAP_SCRIPT_VERSION = 192;
    static getContractAddress(params) {
        const { scriptTree } = TapscriptVerificator.buildScriptTree(params);
        return TapscriptVerificator.generateAddressFromScript(params, scriptTree);
    }
    static verifyControlBlock(params, controlBlock) {
        const { scriptTree, compiledTargetScript, network } = TapscriptVerificator.buildScriptTree(params);
        const tapData = payments.p2tr({
            internalPubkey: toXOnly(params.deployerPubKey),
            network: network,
            scriptTree: scriptTree,
            redeem: {
                output: compiledTargetScript,
                redeemVersion: TapscriptVerificator.TAP_SCRIPT_VERSION,
            },
        });
        const witness = tapData.witness;
        if (!witness || witness.length === 0) {
            return false;
        }
        const requiredControlBlock = witness[witness.length - 1];
        return equals(requiredControlBlock, controlBlock);
    }
    static getContractSeed(deployerPubKey, bytecode, saltHash) {
        const sha256OfBytecode = bitCrypto.hash256(bytecode);
        const buf = concat([deployerPubKey, saltHash, sha256OfBytecode]);
        return bitCrypto.hash256(buf);
    }
    static generateAddressFromScript(params, scriptTree) {
        const network = params.network || networks.bitcoin;
        const transactionData = {
            internalPubkey: toXOnly(params.deployerPubKey),
            network: network,
            scriptTree: scriptTree,
        };
        const tx = payments.p2tr(transactionData);
        return tx.address;
    }
    static buildScriptTree(params) {
        const network = params.network || networks.bitcoin;
        const scriptBuilder = new DeploymentGenerator(params.deployerPubKey, toXOnly(params.contractSaltPubKey), network);
        const compiledTargetScript = scriptBuilder.compile(params.bytecode, params.originalSalt, params.challenge, params.priorityFee, params.calldata, params.features);
        const lockLeafScript = script.compile([
            toXOnly(params.deployerPubKey),
            opcodes.OP_CHECKSIG,
        ]);
        const scriptTree = [
            {
                output: compiledTargetScript,
                version: TapscriptVerificator.TAP_SCRIPT_VERSION,
            },
            {
                output: lockLeafScript,
                version: TapscriptVerificator.TAP_SCRIPT_VERSION,
            },
        ];
        return { scriptTree, compiledTargetScript, network };
    }
}
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