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Implications of Proposing 2 blocks in a Row on POS Ethereum

Etherum Reddit

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Let me first say that I don't fully understand a lot of the nuances and complexities of Ethereum so bear with me here.

I read something the other day that Coinbase, which controls a very large amount stake, was able to propose 12 of 32 blocks in an epoch on the Beacon chain. I would assume that it would be reasonable that this would still be a possible/probable after the merge and that there is a pretty good change that 2 (or more) of these blocks could be proposed in a row by a single entity at some point. Also, my understanding is that such an entity would know beforehand that they are going to propose such blocks (maybe somehow made even more predictable by EIP-1559).

My question is what are the potential implications of such an event? Would an entity be able to basically perform a supercharged MEV or would even more nefarious attack or exploit be possible such as censoring txns, double spending, etc?


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