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Does anyone know if say you have Facebook level of activity, wouldn’t the block chain be in the orders of petabytes to download? I’m sure you may want to know your history all the way back, or does the protocol is smart to know how much you need to download?



ActivityPub does not use a blockchain.

SSB uses an append-only log similar to a blockchain, but it only contains things your identity knows about (you and your friends and channels).




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