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The first two bytes of hash Script Check specify the hash algorithm and length used to verify script Check.
If there was no limit, a rogue miner might broadcast a block that required hundreds of thousands of ECDSA signature operations to validate, and it might be able to get a head start computing the next block while the rest of the network worked to validate the current one.
There is a 1-confirmation attack on old implementations, but it is expensive and difficult in practice.
Instead, they shall contribute to the maximum number allowed per block (20,000) as follows: This BIP replaces BIPs 12 and 17, which propose extensions to the Script system to allow script Pub Key to outsource its verification.
It also replaces BIP 16, which is identical in terms of protocol, but suggests a specific implementation and does not deprecate script Pub Key to maintain protocol consistency.