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Merge pull request #7281: Improve CheckInputs() comment about sig ver…

…ification

fd83615 Improve CheckInputs() comment about sig verification (Peter Todd)
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laanwj committed Jan 19, 2016
2 parents 3b43cad + fd83615 commit f9fd4c2884849bc667da3da8bf5f78f33dd01f1c
Showing with 6 additions and 3 deletions.
  1. +6 −3 src/main.cpp
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@@ -1636,9 +1636,12 @@ bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsVi
// Only if ALL inputs pass do we perform expensive ECDSA signature checks.
// Helps prevent CPU exhaustion attacks.
// Skip ECDSA signature verification when connecting blocks
// before the last block chain checkpoint. This is safe because block merkle hashes are
// still computed and checked, and any change will be caught at the next checkpoint.
// Skip ECDSA signature verification when connecting blocks before the
// last block chain checkpoint. Assuming the checkpoints are valid this
// is safe because block merkle hashes are still computed and checked,
// and any change will be caught at the next checkpoint. Of course, if
// the checkpoint is for a chain that's invalid due to false scriptSigs
// this optimisation would allow an invalid chain to be accepted.
if (fScriptChecks) {
for (unsigned int i = 0; i < tx.vin.size(); i++) {
const COutPoint &prevout = tx.vin[i].prevout;

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