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I'd say it's more of a tree than a chain, but yes. https://www.certificate-transparency.org/log-proofs-work





Blockchain is also a tree, it's just that every branch except one is (usually) abandoned rapidly.

That said, that's just because both use Merkle trees. CT isn't a blockchain.


Its creators also make it very clear that it is not a blockchain. It’s centralized and lacks the consensus mechanism that’s a hallmark of blockchains (PoW or PoS).

Unfortunately people have started taking the pre-existing components of the Blockchain, like Merkle Trees, and calling them "blockchain" too. See "permissioned blockchain".

If I had $1 for every time I’ve heard “did you know git is a blockchain”...




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