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Make Taproot spends standard + policy limits

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This adds a `TxoutType::WITNESS_V1_TAPROOT` for P2TR outputs, and permits spending
them in standardness rules. No corresponding `CTxDestination` is added for it,
as that isn't needed until we want wallet integration. The taproot validation flags
are also enabled for mempool transactions, and standardness rules are added
(stack item size limit, no annexes).
This commit is contained in:
Pieter Wuille 2020-09-11 14:34:10 -07:00
parent 865d2c37e2
commit e9a021d7e6
8 changed files with 61 additions and 7 deletions
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8
src/script/standard.cpp
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@ -55,6 +55,7 @@ std::string GetTxnOutputType(TxoutType t)
case TxoutType::NULL_DATA: return "nulldata";
case TxoutType::WITNESS_V0_KEYHASH: return "witness_v0_keyhash";
case TxoutType::WITNESS_V0_SCRIPTHASH: return "witness_v0_scripthash";
case TxoutType::WITNESS_V1_TAPROOT: return "witness_v1_taproot";
case TxoutType::WITNESS_UNKNOWN: return "witness_unknown";
} // no default case, so the compiler can warn about missing cases
assert(false);
@ -130,6 +131,11 @@ TxoutType Solver(const CScript& scriptPubKey, std::vector<std::vector<unsigned c
vSolutionsRet.push_back(witnessprogram);
return TxoutType::WITNESS_V0_SCRIPTHASH;
}
if (witnessversion == 1 && witnessprogram.size() == WITNESS_V1_TAPROOT_SIZE) {
vSolutionsRet.push_back(std::vector<unsigned char>{(unsigned char)witnessversion});
vSolutionsRet.push_back(std::move(witnessprogram));
return TxoutType::WITNESS_V1_TAPROOT;
}
if (witnessversion != 0) {
vSolutionsRet.push_back(std::vector<unsigned char>{(unsigned char)witnessversion});
vSolutionsRet.push_back(std::move(witnessprogram));
@ -203,7 +209,7 @@ bool ExtractDestination(const CScript& scriptPubKey, CTxDestination& addressRet)
std::copy(vSolutions[0].begin(), vSolutions[0].end(), hash.begin());
addressRet = hash;
return true;
} else if (whichType == TxoutType::WITNESS_UNKNOWN) {
} else if (whichType == TxoutType::WITNESS_UNKNOWN || whichType == TxoutType::WITNESS_V1_TAPROOT) {
WitnessUnknown unk;
unk.version = vSolutions[0][0];
std::copy(vSolutions[1].begin(), vSolutions[1].end(), unk.program);