RPC methods to serve:

• engine_newPayload{V1,V2,V3,V4}: check that the payload matches the real one. Error if it does not, and abort the sync test.
• engine_forkchoiceUpdated{V1,V2,V3}: check if the forkchoice hashes are canonical. Update the test_head, test_safe, test_finalized in-memory forkchoice values. And check if the block-building attributes (if any) match the inputs to the actual block.
• engine_getPayload{V1,V2,V3,V4}: return the block that matches the expected block from the block-building job arguments.

Note that engine_newPayload and engine_forkchoiceUpdated is enough for checking the L2 CL sync as a verifier. engine_getPayload is needed when the CL is acting as a sequencer.

• Isthmus Engine APIs: op-sync-tester: Verifier Engine APIs for Isthmus #17072
  • engine_newPayloadV4, engine_getPayloadV4, engine_forkchoiceUpdatedV3
• Ecotone, Fjord, Granite, Holocene Engine APIs: op-sync-tester: Verifier Engine APIs for Ecotone, Fjord, Granite, Holocene #17181
  • engine_newPayloadV3, engine_getPayloadV3, engine_forkchoiceUpdatedV3
• Bedrock, Canyon, Delta Engine APIs: op-sync-tester: Verifier Engine APIs for Bedrock, Canyon, Delta #17234
  • engine_newPayloadV1, engine_getPayloadV1, engine_forkchoiceUpdatedV1, engine_newPayloadV2, engine_getPayloadV2, engine_forkchoiceUpdatedV2