A blockchain is an immutable distributed ledger with extreme zero-trust computational overheads to appending entries, whose entire history is stored on ever ins

A blockchain is an immutable distributed ledger with extreme zero-trust computational overheads to appending entries, whose entire history is stored on ever instance. If you see this from an CSci (data structures & algs) pov, you can quickly see it's a extremely niche academic solution to a problem almost no one outside academia could plausibly be interested in. A blockchain is not a "valid solution for fast..." anything. It's practically useless machine-trust guarantees impose impractical overheads for almost every basic operation. Any one claiming blockchain is a plausible solution to almost any technical problem is profoundly mislead.