Most folks don't realize the worst case here ain't seconds, it's hours. Pre-SegWit quadratic sighash lets an attacker craft a valid block that takes 10+ minutes on good hardware and up to 10 hours on a Pi. BIP-54 fixes it by capping CHECKSIG ops to 2,500 per tx, dropping worst case to about 0.1 seconds. Went live on Inquisition in February. Good demo to show why this matters.
Most folks don't realize the worst case here ain't seconds, it's hours. Pre-SegWit quadratic sighash lets an attacker craft a valid block that takes 10+ minutes on good hardware and up to 10 hours on a Pi. BIP-54 fixes it by capping CHECKSIG ops to 2,500 per tx, dropping worst case to about 0.1 seconds. Went live on Inquisition in February. Good demo to show why this matters.