chore: add eip4844 constants

crates/primitives/src/constants/eip4844.rs

@@ -0,0 +1,22 @@
+//! [EIP-4844](https://eips.ethereum.org/EIPS/eip-4844#parameters) protocol constants for shard Blob Transactions.
+
+/// Size a single field element in bytes.
+pub const FIELD_ELEMENT_BYTES: u64 = 32;
+
+/// How many field elements are stored in a single data blob.
+pub const FIELD_ELEMENTS_PER_BLOB: u64 = 4096;
+
+/// Gas consumption of a single data blob.
+pub const DATA_GAS_PER_BLOB: u64 = 131_072u64; // 32*4096 = 131072 == 2^17 == 0x20000
+
+/// Maximum data gas for data blobs in a single block.
+pub const MAX_DATA_GAS_PER_BLOCK: u64 = 786_432u64; // 0xC0000
+
+/// Target data gas for data blobs in a single block.
+pub const TARGET_DATA_GAS_PER_BLOCK: u64 = 393_216u64; // 0x60000
+
+/// Maximum number of data blobs in a single block.
+pub const MAX_BLOBS_PER_BLOCK: u64 = MAX_DATA_GAS_PER_BLOCK / DATA_GAS_PER_BLOB; // 131072 / 786432 = 6
+
+/// Used to determine the price for next data blob
+pub const BLOB_GASPRICE_UPDATE_FRACTION: u64 = 3_338_477u64; // 3338477

crates/primitives/src/constants.rs → crates/primitives/src/constants/mod.rs

@@ -4,6 +4,9 @@ use crate::{H256, U256};
 use hex_literal::hex;
 use std::time::Duration;
 
+/// [EIP-4844](https://eips.ethereum.org/EIPS/eip-4844#parameters) constants.
+pub mod eip4844;
+
 /// The client version: `reth/v{major}.{minor}.{patch}`
 pub const RETH_CLIENT_VERSION: &str = concat!("reth/v", env!("CARGO_PKG_VERSION"));