Blockchain (as in a Merkle tree with some way to decide on a particular path to a leaf as the canonical "correct" chain) is useful in plenty of things, eg git.

Blockchain (as in a Merkle tree with some way to decide on a particular path to a leaf as the canonical "correct" chain) is useful in plenty of things, eg git. Blockchain as in the above with a decentralized decision function (proof-of-work, maybe proof-of-stake) is less likely to be useful outside cryptocurrency. Typically when people talk about "blockchain" they mean the latter.