[Feature] EIP-7691

[onbjerg]

Component

consensus, eips, genesis

Describe the feature you would like

EIP-7691 is mostly a CL change, however, it will also change BLOB_BASE_FEE_UPDATE_FRACTION in the EL to change the fee market a bit. This is a patchwork solution until we gather more info about blob fee markets for Fusaka.

See the relevant PR that adds these EL changes: https://github.com/ethereum/EIPs/pull/9060/files

TL;DR: For < Prague we use the current BLOB_BASE_FEE_UPDATE_FRACTION, for >= Prague use BLOB_BASE_FEE_UPDATE_FRACTION_ELECTRA.

Relevant snippets:

alloy/crates/eips/src/eip4844/mod.rs

Lines 70 to 71 in 20d13fa

	/// Determines the maximum rate of change for blob fee
	pub const BLOB_GASPRICE_UPDATE_FRACTION: u128 = 3_338_477u128; // 3338477

alloy/crates/eips/src/eip4844/mod.rs

Lines 131 to 142 in 20d13fa

	/// Calculates the blob gas price from the header's excess blob gas field.
	///
	/// See also [the EIP-4844 helpers](https://eips.ethereum.org/EIPS/eip-4844#helpers)
	/// (`get_blob_gasprice`).
	#[inline]
	pub fn calc_blob_gasprice(excess_blob_gas: u64) -> u128 {
	fake_exponential(
	BLOB_TX_MIN_BLOB_GASPRICE,
	excess_blob_gas as u128,
	BLOB_GASPRICE_UPDATE_FRACTION,
	)
	}

Additional context

No response

[nadtech-hub]

✋