Top Highlights

• the fork choice algorithm picks the block that forms the chain with the greatest weight of attestations (where weight is the number of validators attesting scaled by their ETH balance)
• a general agreement has been reached
• The canonical chain is then determined by a fork-choice rule that selects the set of blocks that have had the most work done to mine them.
• however, now that Ethereum runs on proof-of-stake it adopted an updated fork-choice algorithm that measures the 'weight' of the chain.
• chain selection rule is used to decide which chain is the "correct" chain. Bitcoin uses the "longest chain" rule, which means that whichever blockchain is the longest

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