The blockchain is a distributed append-only database. While it’s an essential part of the bitcoin engine, it’s not really a thing that can successfully be applied to other technologies despite what people might believe. The longest blockchain, meaning the one with the most Proof-of-Work on it, is always the true chain. The blocks are kept at a manageable 1 Mb (plus some more after SegWit) so that anyone can run a node for complete decentralization.
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