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Merge pull request #7281: Improve CheckInputs() comment about sig verification
fd83615 Improve CheckInputs() comment about sig verification (Peter Todd)
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@ -1636,9 +1636,12 @@ bool CheckInputs(const CTransaction& tx, CValidationState &state, const CCoinsVi
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// Only if ALL inputs pass do we perform expensive ECDSA signature checks.
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// Helps prevent CPU exhaustion attacks.
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// Skip ECDSA signature verification when connecting blocks
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// before the last block chain checkpoint. This is safe because block merkle hashes are
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// still computed and checked, and any change will be caught at the next checkpoint.
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// Skip ECDSA signature verification when connecting blocks before the
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// last block chain checkpoint. Assuming the checkpoints are valid this
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// is safe because block merkle hashes are still computed and checked,
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// and any change will be caught at the next checkpoint. Of course, if
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// the checkpoint is for a chain that's invalid due to false scriptSigs
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// this optimisation would allow an invalid chain to be accepted.
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if (fScriptChecks) {
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for (unsigned int i = 0; i < tx.vin.size(); i++) {
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const COutPoint &prevout = tx.vin[i].prevout;
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