engine: EIP-7843 changes - adding slot number to fcU#731
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@nerolation could we get this reviewed also please |
nerolation
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Jan 20, 2026
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@Marchhill can we move this forward? |
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@mkalinin @lightclient @fjl need to move this forward for bal-devnet-2 and the other execution-api PRs see https://notes.ethereum.org/@ethpandaops/bal-devnet-2 |
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The execution-apis spec defines slotNumber as uint64 (hex-encoded string), but PayloadAttributes was missing the serde quantity attribute. This caused engine_forkchoiceUpdatedV4 to fail with: 'invalid type: string "0x0", expected u64' See: ethereum/execution-apis#731 Amp-Thread-ID: https://ampcode.com/threads/T-019c0b50-5b65-759b-b375-7a23102f5675 Co-authored-by: Amp <amp@ampcode.com>
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…3619) The execution-apis spec defines slotNumber as uint64 (hex-encoded string), but PayloadAttributes was missing the serde quantity attribute. This caused engine_forkchoiceUpdatedV4 to fail with: 'invalid type: string "0x0", expected u64' See: ethereum/execution-apis#731 Amp-Thread-ID: https://ampcode.com/threads/T-019c0b50-5b65-759b-b375-7a23102f5675 Co-authored-by: Amp <amp@ampcode.com>
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See ethereum/execution-apis#731 ## Summary - **Caplin block production** (`produceBeaconBody`) now sets `PayloadAttributes.SlotNumber` to the target slot when the Glamsterdam (Gloas) fork is active, so `engine_forkchoiceUpdatedV4` sends the slot number per EIP-7843 - **Payload attributes SSE event** (`emitNextPaylodAttributesEvent`) also populates `SlotNumber` for Glamsterdam - **Local execution path** (`ChainReaderWriterEth1.AssembleBlock`) now forwards `SlotNumber` from `PayloadAttributes` into the protobuf `AssembleBlockRequest`, closing the gap for the direct (non-JSON-RPC) execution path - Adds `GloasForkEpoch`/`GloasForkVersion` to `BeaconChainConfig` (defaulting to `MaxUint64` on mainnet, inherited by all networks) so `GetCurrentStateVersion` can return `GloasVersion` when the fork activates 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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