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Enforce Taproot script flags whenever WITNESS is set

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This commit is contained in:
MarcoFalke
2021-11-16 14:40:19 +01:00
parent fa42299411
commit cccc1e70b8
4 changed files with 28 additions and 27 deletions
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23
src/validation.cpp
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@@ -1581,18 +1581,18 @@ static ThresholdConditionCache warningcache[VERSIONBITS_NUM_BITS] GUARDED_BY(cs_
static unsigned int GetBlockScriptFlags(const CBlockIndex& block_index, const Consensus::Params& consensusparams)
{
unsigned int flags = SCRIPT_VERIFY_NONE;
// BIP16 didn't become active until Apr 1 2012 (on mainnet, and
// retroactively applied to testnet)
// However, only one historical block violated the P2SH rules (on both
// mainnet and testnet), so for simplicity, always leave P2SH
// on except for the one violating block.
if (consensusparams.BIP16Exception.IsNull() || // no bip16 exception on this chain
*Assert(block_index.phashBlock) != consensusparams.BIP16Exception) // this block isn't the historical exception
{
// Enforce WITNESS rules whenever P2SH is in effect
flags |= SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS;
// mainnet and testnet).
// Similarly, only one historical block violated the TAPROOT rules on
// mainnet.
// For simplicity, always leave P2SH+WITNESS+TAPROOT on except for the two
// violating blocks.
uint32_t flags{SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_WITNESS | SCRIPT_VERIFY_TAPROOT};
const auto it{consensusparams.script_flag_exceptions.find(*Assert(block_index.phashBlock))};
if (it != consensusparams.script_flag_exceptions.end()) {
flags = it->second;
}
// Enforce the DERSIG (BIP66) rule
@@ -1610,11 +1610,6 @@ static unsigned int GetBlockScriptFlags(const CBlockIndex& block_index, const Co
flags |= SCRIPT_VERIFY_CHECKSEQUENCEVERIFY;
}
// Enforce Taproot (BIP340-BIP342)
if (DeploymentActiveAt(block_index, consensusparams, Consensus::DEPLOYMENT_TAPROOT)) {
flags |= SCRIPT_VERIFY_TAPROOT;
}
// Enforce BIP147 NULLDUMMY (activated simultaneously with segwit)
if (DeploymentActiveAt(block_index, consensusparams, Consensus::DEPLOYMENT_SEGWIT)) {
flags |= SCRIPT_VERIFY_NULLDUMMY;