Method GetSpendData

src/script/signingprovider.cpp:474–499

WitnessV1Taproot TaprootBuilder::GetOutput() { return WitnessV1Taproot{m_output_key}; }

TaprootSpendData TaprootBuilder::GetSpendData() const
{
    assert(IsComplete());
    assert(m_output_key.IsFullyValid());
    TaprootSpendData spd;
    spd.merkle_root = m_branch.size() == 0 ? uint256() : m_branch[0]->hash;
    spd.internal_key = m_internal_key;
    if (m_branch.size()) {
        // If any script paths exist, they have been combined into the root m_branch[0]
        // by now. Compute the control block for each of its tracked leaves, and put them in
        // spd.scripts.
        for (const auto& leaf : m_branch[0]->leaves) {
            std::vector<unsigned char> control_block;
            control_block.resize(TAPROOT_CONTROL_BASE_SIZE + TAPROOT_CONTROL_NODE_SIZE * leaf.merkle_branch.size());
            control_block[0] = leaf.leaf_version | (m_parity ? 1 : 0);
            std::copy(m_internal_key.begin(), m_internal_key.end(), control_block.begin() + 1);
            if (leaf.merkle_branch.size()) {
                std::copy(leaf.merkle_branch[0].begin(),
                          leaf.merkle_branch[0].begin() + TAPROOT_CONTROL_NODE_SIZE * leaf.merkle_branch.size(),
                          control_block.begin() + TAPROOT_CONTROL_BASE_SIZE);
            }
            spd.scripts[{leaf.script, leaf.leaf_version}].insert(std::move(control_block));
        }
    }
    return spd;
}

std::optional<std::vector<std::tuple<int, std::vector<unsigned char>, int>>> InferTaprootTree(const TaprootSpendData& spenddata, const XOnlyPubKey& output)
{