feat(builder): add support for block access list (EIP-7928) for flashblocks builder#261
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feat(builder): add support for block access list (EIP-7928) for flashblocks builder#261
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Add access list generation to the flashblocks builder, tracking all state reads and writes during EVM execution indexed by transaction position. This enables parallel execution hints for downstream consumers. Builder-side changes: - Add `access_lists` module to xlayer-builder with types, incremental builder, and DB interceptor (ported from Base's base-access-lists) - Add `process_transaction_state()` to extract access list data from revm changesets — uses `Account.original_info` for pre-state diffing instead of Base's DB wrapper approach (avoids State trait conflicts) - Integrate at all 3 execution points: sequencer txs, cached txs, pool txs - Finalize per-flashblock via `std::mem::take` + `build()` in `build_block()` - Populate `OpFlashblockPayloadMetadata.access_list` with EIP-7928 data - Bump deps/optimism submodule to include op-alloy access_list field 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Stop populating `receipts` and `new_account_balances` in flashblock metadata, replaced by the richer EIP-7928 access list. This aligns with Base PR base/base#1428 which removes these fields post-V1. - Remove `new_account_balances` computation from `build_block()` - Remove `receipts_with_hash` construction from `build_block()` - Set both fields to `None` in all metadata construction sites - Update test framework to handle optional receipts field - Bump deps/optimism submodule with optional metadata fields 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
Adds support for block-level access list generation (EIP-7928) to the flashblocks builder. The block-level access list adds tracking all state reads and writes during EVM execution indexed by transaction position, which is added into the optional OpFlashblockPayloadMetadata access list field (okx/optimism#221, ethereum-optimism/optimism#20096)
Builder-side changes:
access_listsmodule to xlayer-builder with types, incremental builder, and DB interceptorprocess_transaction_state()to extract access list data from revm changesets — usesAccount.original_infofor pre-state diffingstd::mem::take+build()inbuild_block()OpFlashblockPayloadMetadata.access_listwith EIP-7928 data🤖 Generated with Claude Code