EIP-8304: trustless log and transaction index, implementation tracking

[VanshSahay]

Tracking EIP-8304 (trustless log and transaction index) implementation for EPF cohort seven.

Spec: https://eips.ethereum.org/EIPS/eip-8304
Project: https://github.com/eth-protocol-fellows/cohort-seven/blob/main/projects/eip-8304-trustless-log-index.md

Plan is small incremental PRs, no mega-PR. M0 is system contract plumbing. We skip fork config entirely: the system call runs unconditionally (EIP-4788 style), the gate (IsHegotá, EIP-8081) comes at wiring-PR time.

Status:

• constants + dev-genesis alloc: done on eip8304-m0, bytecode verified against the spec
• system call in PostExecution: done, gated on Amsterdam
• golden bytecode test: done (core/logindex_contract_test.go)
• spec pinned: ethereum/EIPs@a9b074c (2026-07-14)
• performance baselines: done (core/bench_eip8304_test.go)
• devnet re-verification: pending

PR checklist (link each as it opens):

• 1. core, params: EIP-8304 system contract plumbing (constants, dev-genesis alloc, system call, golden bytecode test) - core, params: EIP-8304 system contract plumbing ethereum/go-ethereum#35496
• 2. core: EIP-8304 variable-length index entries (42/50/38/50-byte encodings, lexicographic sort) - core, miner: EIP-8304 variable-length index entries ethereum/go-ethereum#35571
• 3. core: EIP-8304 SSZ table roots (SHA2-256 leaves, List[Hash32] merkleization)
• 4. core: EIP-8304 k-way table merges (all 5 levels, table_size/4 merge delay)
• 5. core: EIP-8304 file-backed table storage (1024-slot ring buffer, restart recovery)
• 6. core, miner: EIP-8304 replay and reorg handling (nil-tables divergence, rollback, IsHegotá gate)
• 7. eth: EIP-8304 proof-index database (canonical hash tracking, pruning, rebuild)
• 8. eth: pureth_getLogsWithProofV1 RPC (query semantics, filters, proof format)