EIP-7918: Blob base fee bounded by execution cost

EIPs EIPs core
21

Specifically; rather than using TX_BASE_COST use POINT_EVALUATION_PRECOMPILE_GAS and also enforce floor first so an individual blob cost shouldn’t stay under the cost of EL verification

So changing to

def calc_excess_blob_gas(parent: Header) -> int:
    base_blob_fee = get_base_fee_per_blob_gas(parent) * GAS_PER_BLOB
    base_verification_fee = parent.base_fee_per_gas * POINT_EVALUATION_PRECOMPILE_GAS

    if base_verification_fee > base_blob_fee:
        # Fee too low relative to execution cost
        # increase, but not by more than a max fill would (e.g. div 3 for 6/9)
        return parent.excess_blob_gas + parent.blob_gas_used // 3

    if parent.excess_blob_gas + parent.blob_gas_used < TARGET_BLOB_GAS_PER_BLOCK:
        # Below target usage; blob fee sufficiently high; reset excess
        return 0
    else:
        # Above target usage; normal EIP-4844 excess gas logic
        return parent.excess_blob_gas + parent.blob_gas_used - TARGET_BLOB_GAS_PER_BLOCK
2 Likes