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Proof of Keys isn’t a new consensus algorithm for blockchain; instead, it’s just an event where people simultaneously pull all of their cryptocurrency out of centralized exchanges. One of the main goals of the event is to make sure that exchanges have the funds that they claim to have. After all, if they don’t, then there’s no guarantee that you actually have the coins you purchased on the exchange. So if it’s already an issue, at least it’s exposed sooner than later.