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Update EIP-7742: use parent target blob count for excess blob gas calculation #9122

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Dec 9, 2024
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Update EIP-7742: use parent target blob count for excess blob gas calculation #9122

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12 changes: 11 additions & 1 deletion EIPS/eip-7742.md
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Original file line number Diff line number Diff line change
Expand Up @@ -81,7 +81,17 @@ target blob count given by that genesis block's protocol rule set.
Upon activating this EIP (i.e. before processing any transactions),
the verification of the blob maximum as given in EIP-4844 can be skipped. Concretely, this means any logic relating
to `MAX_BLOB_GAS_PER_BLOCK` as given in EIP-4844 can be deprecated.
Additionally, any reference to `TARGET_BLOB_GAS_PER_BLOCK` from EIP-4844 can be derived by taking the `target_blobs_per_block` from the CL and multiplying by `GAS_PER_BLOB` as given in EIP-4844.

Additionally, `calc_excess_blob_gas` is updated as follows:

```python
def calc_excess_blob_gas(parent: Header) -> int:
target_blob_gas = parent.target_blobs_per_block * GAS_PER_BLOB
if parent.excess_blob_gas + parent.blob_gas_used < target_blob_gas:
return 0
else:
return parent.excess_blob_gas + parent.blob_gas_used - target_blob_gas
```

Otherwise, the specification of EIP-4844 is not changed. For example, blob base fee accounting and excess blob gas tracking occur in the exact same way.

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