Function MatchMultiA

src/script/solver.cpp:107–139

}

std::optional<std::pair<int, std::vector<std::span<const unsigned char>>>> MatchMultiA(const CScript& script)
{
    std::vector<std::span<const unsigned char>> keyspans;

    // Redundant, but very fast and selective test.
    if (script.size() == 0 || script[0] != 32 || script.back() != OP_NUMEQUAL) return {};

    // Parse keys
    auto it = script.begin();
    while (script.end() - it >= 34) {
        if (*it != 32) return {};
        ++it;
        keyspans.emplace_back(&*it, 32);
        it += 32;
        if (*it != (keyspans.size() == 1 ? OP_CHECKSIG : OP_CHECKSIGADD)) return {};
        ++it;
    }
    if (keyspans.size() == 0 || keyspans.size() > MAX_PUBKEYS_PER_MULTI_A) return {};

    // Parse threshold.
    opcodetype opcode;
    std::vector<unsigned char> data;
    if (!script.GetOp(it, opcode, data)) return {};
    if (it == script.end()) return {};
    if (*it != OP_NUMEQUAL) return {};
    ++it;
    if (it != script.end()) return {};
    auto threshold = GetScriptNumber(opcode, data, 1, (int)keyspans.size());
    if (!threshold) return {};

    // Construct result.
    return std::pair{*threshold, std::move(keyspans)};
}

TxoutType Solver(const CScript& scriptPubKey, std::vector<std::vector<unsigned char>>& vSolutionsRet)
{