Reth

Installation

Please follow the official documentation to build the modified Reth from source code.

Block Simulation

We modified Reth to introduce a new JSON-RPC API method, eth_simulateBlock, which can be used to simulate a new block against a specific state. Below is an example using Python to invoke this method.

import json
import requests

from web3 import Web3

# send rpc request to API eth_simulateBlock
def rpc_simulate_block(url, raw_transactions, block_number, base_fee, coinbase, addresses, timestamp):
    payload = json.dumps({
        "method": "eth_simulateBlock",
        "params": [
            {
              "txs":  raw_transactions,
              "blockNumber": block_number,
              "coinbase": Web3.to_checksum_address(coinbase),
              "baseFee": base_fee,
              "stateBlockNumber": hex(block_number-1),
              "builderAddresses": addresses,
              "timestamp": timestamp
          }],
        "id": 1,
        "jsonrpc": "2.0"
    })
    
    headers = {
        'Content-Type': 'application/json'
    }

    response = requests.post(url, headers=headers, data=payload, timeout=60)

    return response.json()

Parameters for eth_simulateBlock

• txs: A list of hex-encoded signed transactions that will be included in the simulated block.
• blockNumber: The block number for which this block is valid on.
• coinbase: A checksummed Ethereum address of the block fee recipient for the simulated block.
• baseFee: The base fee of the block to use for this simulation.
• stateBlockNumber: Either a hex encoded number or a block tag for which state to base this simulation on.
• builderAddresses: A list of addresses of the builder.
• timestamp: The timestamp to use for this block simulation, in seconds since the unix epoch.

Notes

To enable block simulation against any block state, you should run Reth as an archive node.