Method ComputeTapTweakHash

src/pubkey.cpp:224–233

static const CHashWriter HASHER_TAPTWEAK_ELEMENTS = TaggedHash("TapTweak/elements");

uint256 XOnlyPubKey::ComputeTapTweakHash(const uint256* merkle_root) const
{
    if (merkle_root == nullptr) {
        // We have no scripts. The actual tweak does not matter, but follow BIP341 here to
        // allow for reproducible tweaking.
        return (CHashWriter(HASHER_TAPTWEAK_ELEMENTS) << m_keydata).GetSHA256();
    } else {
        return (CHashWriter(HASHER_TAPTWEAK_ELEMENTS) << m_keydata << *merkle_root).GetSHA256();
    }
}

bool XOnlyPubKey::CheckTapTweak(const XOnlyPubKey& internal, const uint256& merkle_root, bool parity) const
{