Finalization is just something that happens when enough clients, enough validators have given the thumbs up about a certain epoch. Epochs which are, I believe, Preston's going to come in here and give me the whip. If an epoch is finalized, it requires slashing conditions to go back and unwind those blocks. And so if a block isn't finalized, it's not as permanently embedded into the blockchain as otherwise could be except with this event which happened twice because blocks were being missed, validators were not doing their jobs.

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