Method isMultisig

lib/script/script.js:1925–1957

* Test whether the output script is pay-to-multisig. * @param {Boolean} [minimal=false] - Minimaldata only. * @returns {Boolean}

(minimal)

   */

  isMultisig(minimal) {
    if (this.code.length < 4 || this.code.length > 19)
      return false;

    if (this.getOp(-1) !== opcodes.OP_CHECKMULTISIG)
      return false;

    const m = this.getSmall(0);

    if (m < 1)
      return false;

    const n = this.getSmall(-2);

    if (n < 1 || m > n)
      return false;

    if (this.code.length !== n + 3)
      return false;

    for (let i = 1; i < n + 1; i++) {
      const op = this.code[i];
      const size = op.toLength();

      if (size !== 33 && size !== 65)
        return false;

      if (minimal && !op.isMinimal())
        return false;
    }

    return true;
  }

  /**
   * Get multisig m and n values if present.