reth private transaction

This project extends reth with a custom RPC method that allows users to bypass the public mempool and send transactions directly to block builders, protecting against frontrunning and sandwich attacks.

Overview

This extension adds a new RPC method eth_sendPrivateRawTransaction to the standard Ethereum JSON-RPC API that enables private transaction submission directly to the following block builders:

• Titan
• Beaverbuild
• rsync-builder

By bypassing the public mempool, transactions are kept private until they are included in a block, significantly reducing the risk of frontrunning and sandwich attacks.

Installation

# build the binary
cargo build --release

# run the binary with the `reth` commands
./target/release/reth-private-transaction node --authrpc.jwtsecret \
        --datadir /data/mainnet/ \
        --authrpc.jwtsecret /data/mainnet/secrets/jwt.hex \
        --http --ws --http.addr 0.0.0.0 --ws.addr 0.0.0.0 \
        --http.api txpool,web3,eth,debug,trace \
        --ws.api txpool,web3,eth,debug,trace \

The RPC method will be automatically registered under the eth namespace

Usage

Send a raw transaction privately using the new RPC method:

{
  "jsonrpc": "2.0",
  "method": "eth_sendPrivateRawTransaction",
  "params": ["0x..."], // Signed raw transaction hex
  "id": 1
}

The method returns the transaction hash if at least one builder successfully accepts the transaction.