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Engine API: A Visual Guide - HackMD

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The Engine API is the interface that allows communication between the execution and the consensus layer of an Ethereum node. Since the merge, this API has become a vital piece of Ethereum's architecture. It coordinates important tasks such as block validation and block proposal. Even with its importance, it's hard to find resources beyond the Engine API spec when learning about it. Trying to understand the API just by reading the spec is a challenging task. For that reason, in this article, I'll explain the most important flows of the Engine API. I'll indicate how those flows can fail, where the spec dictates them, and how they fit together. This article is part of my EPF project. Here's a brief explanation of the functions we will encounter along the way: When you run the command to start a beacon node, two Engine API endpoints are called: engine_exchangeCapabilities and engine_forkchoiceUpdatedV2. Ideally, the following would be the communication between the Execution Layer Client (E

Engine API: A Visual Guide - HackMD # Engine API: A Visual Guide The Engine API is the interface that allows communication between the execution and the consensus layer of an Ethereum node. Since the merge, this API has become a vital piece of Ethereum's architecture. It coordinates important tasks such as block validation and block proposal. Even with its importance, it's hard to find resources beyond the [Engine API spec](https://github.com/ethereum/execution-apis/blob/main/src/engine) when learning about it. Trying to understand the API just by reading the spec is a challenging task. For th

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