@btc-vision/transaction/build/generators/builders/MultiSignGenerator.js

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

import { opcodes, script, toXOnly } from '@btc-vision/bitcoin';
export class MultiSignGenerator {
    static compile(vaultPublicKeys, minimumSignatures = 0, internal) {
        if (minimumSignatures < 2) {
            throw new Error('Minimum signatures must be greater than 1');
        }
        if (vaultPublicKeys.length < minimumSignatures) {
            throw new Error('The amount of public keys is lower than the minimum required');
        }
        if (minimumSignatures > MultiSignGenerator.MAXIMUM_SUPPORTED_SIGNATURE) {
            throw new Error(`The maximum amount of signatures is ${MultiSignGenerator.MAXIMUM_SUPPORTED_SIGNATURE}`);
        }
        const minimumRequired = Buffer.alloc(1);
        minimumRequired.writeUInt8(minimumSignatures);
        vaultPublicKeys = vaultPublicKeys.filter((buf, index, self) => index === self.findIndex((otherBuf) => buf.equals(otherBuf)));
        vaultPublicKeys = vaultPublicKeys.sort((a, b) => a.compare(b));
        let included = false;
        const data = vaultPublicKeys.map((key) => {
            const newKey = toXOnly(key);
            if (internal && !included)
                included = internal.equals(newKey);
            return newKey;
        });
        if (internal && !included)
            data.push(internal);
        const compiledData = [
            opcodes.OP_0,
            ...data.flatMap((key) => [
                key,
                opcodes.OP_CHECKSIGADD,
            ]),
            minimumRequired,
            opcodes.OP_NUMEQUAL,
        ];
        const asm = compiledData.flat();
        const compiled = script.compile(asm);
        const decompiled = script.decompile(compiled);
        if (!decompiled) {
            throw new Error('Failed to decompile script.');
        }
        return compiled;
    }
}
MultiSignGenerator.MAXIMUM_SUPPORTED_SIGNATURE = 255;