# First Merge Proof and Benchmarks Shared for EIP-8304 Trustless Log and Transaction Index

Canonical: https://forkbrief.com/news/7c13e13e-828a-45cd-891a-d0f3592d545a
Published: 2026-09-09T00:00:30.047Z
Publisher: Fork Brief

Developers have produced the first proof-of-concept merge proof for Ethereum’s proposed EIP-8304 trustless log and transaction index, demonstrating it is feasible to merge blocks in a verifiable, cost-effective manner using cryptographic proofs. Benchmarks and code compatibility were also confirmed.

## Proof-of-concept for EIP-8304 merging implemented

A team collaborating on EIP-8304, Ethereum’s trustless log and transaction index proposal, has successfully produced the first merge proof for grouping indexed block tables. Using four consecutive 256-block tables from mainnet, they proved their combination into a single 1,024-block table. The process used the SP1 prover and Groth16 protocol, completing in 107 minutes on a single L40S GPU, for about $2 in hardware costs. The computed roots matched those obtained by the reference implementation, confirming both encoding and root compatibility. [ethereum-magicians.org](https://ethereum-magicians.org/t/eip-8304-trustless-log-and-transaction-index/28824)

## Benchmarks and next steps for trustless indexing

Benchmarking revealed that about 83% of the compute time was consumed by SHA-256 re-hashing of input and output tables during merging, while the actual merge computation was minimal. Developers are now working on recursive merge proofs for even larger historical tables, alongside a contract to track these tables’ history for on-chain lookup proofs. The feasibility of using this system for pre-fork Ethereum history is also being investigated, with consensus being that hardcoded, independently verified table roots can act as interim solutions. [ethereum-magicians.org](https://ethereum-magicians.org/t/eip-8304-trustless-log-and-transaction-index/28824)

## Sources

- [EIP-8304: Trustless log and transaction index](https://ethereum-magicians.org/t/eip-8304-trustless-log-and-transaction-index/28824) — Ethereum Magicians

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