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Upgrading Ethereum | 3.7.2 Bellatrix Fork Choice

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This section covers the additional Bellatrix fork choice document, v1.3.0. For a complementary take, see Vitalik's annotated Bellatrix fork choice (based on a slightly older version). As usual, text with a side bar is quoted directly from the specification. This is the modification of the fork choice according to the executable beacon chain proposal. Note: It introduces the process of transition from the last PoW block to the first PoS block. The "executable beacon chain proposal"1 is what became known as The Merge, and is specified by EIP-3675 together with the Bellatrix upgrade on the beacon chain. Upgrades to Ethereum's protocol are normally planned to take place at pre-determined block heights. For security reasons, the Merge upgrade used a different trigger, specifically a terminal total difficulty of proof of work mining. The first proof of work block to reach that amount of accumulated difficulty became the last proof of work block: all subsequent execution blocks are now merged

Upgrading Ethereum | 3.7.2 Bellatrix Fork Choice Part 3: Annotated Specification Fork Choice Bellatrix Fork Choice Introduction This section covers the additional Bellatrix fork choice document, v1.3.0 . For a complementary take, see Vitalik's annotated Bellatrix fork choice (based on a slightly older version). As usual, text with a side bar is quoted directly from the specification. This is the modification of the fork choice according to the executable beacon chain proposal. Note : It introduces the process of transition from the last PoW block to the first PoS block. The "executable beacon

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