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Update EIP-7667: clarify 512 GAS sentence #8952

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Update EIP-7667: clarify 512 GAS sentence #8952

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2 changes: 1 addition & 1 deletion EIPS/eip-7667.md
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Expand Up @@ -57,7 +57,7 @@ A possible alternative to this approach is to implement either multidimensional

## Backwards Compatibility

For most applications, a reasonable upper bound is that data that is getting hashed in the EVM is getting brought in as calldata. If the hashing being done is binary Merkle proof verification, every 32 bytes of data corresponds to a 64-byte (2-word) hash. A word of costs 512 gas. Under the new costs, the hashing per word in that situation would be `300 + 60 * 2 = 420` gas. Hence, this will increase gas consumption for that component of the application by less than 2x.
For most applications, a reasonable upper bound is that data that is getting hashed in the EVM is getting brought in as calldata. If the hashing being done is binary Merkle proof verification, every 32 bytes of data corresponds to a 64-byte (2-word) hash. A word already costs 512 gas for calldata. Under the new costs, the hashing per word in that situation would be `300 + 60 * 2 = 420` gas. Hence, this will increase gas consumption for that component of the application by less than 2x.

Concretely, a length-20 Keccak-based binary Merkle proof gas cost would increase from `(512 + 42) * 20 = 11080` to `(512 + 420) * 20 = 18640`. This is a small increase, especially taking into account other costs associated with such an application.

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