About

This repository provides an example workflow that attaches preconfirmations to blob transactions. The script supports sending transactions to a public endpoint or directly to the Titan relay for private transactions. This project demonstrates how to send blob transactions with preconfirmation bids in the Ethereum Holesky testnet. It includes a script to interact with a mev-commit p2p bidder node.

Requirements

• funded holesky address
• funded mev-commit address
• mev-commit p2p bidder node v0.5.0 or higher

Installation

cd preconf_blob_bidder

Then go mod tiny to install dependencies.

Making a preconf bid

1. Ensure the mev-commit bidder node is starting in the background. See here for a quickstart. This is the following command to use: curl -L -o launchmevcommit launch.mev-commit.xyz; chmod +x launchmevcommit; ./launchmevcommit --node-type bidder

2. go run cmd/preconfethtransfer.go --endpoint endpoint --privatekey private_key where endpoint is the endpoint of the Holesky node and private_key is the private key of the account that will be used to send the transactions.

• --endpoint: The RPC endpoint of your Ethereum Holesky node.
• --privatekey: The private key of the account that will send the transaction.
• --private: Set this flag to True to send the transaction privately to the Titan relay. Otherwise, it will send the transaction to the public Ethereum endpoint.

sendblob.go()

Main Logic:

The main() function sets up the mev-commit bidder client and connects to the Ethereum client using the provided endpoint. It checks for pending transactions in a loop, sending a new blob transaction if no transactions are pending. The loop runs for 12 hours, after which it stops. sendPreconfBid:

sendPreconfBid sends a preconfirmation bid for a transaction. The bid amount and decay period are hardcoded but can be adjusted if needed. checkPendingTxs:

checkPendingTxs checks the status of transactions that were sent. If a transaction is still pending, it resends a preconfirmation bid. If the transaction is confirmed, it removes it from the pending transactions list.