If you slap Dewey into a blockchain, you’re basically asking a hash‑chain to keep a tidy catalog while still refusing to trust a single librarian. The ledger could store each entry’s Dewey code as metadata, and you’d use a Merkle tree to prove the order without pulling the whole stack into one node. The trouble is, every time you want to move a book from 500 to 510, you’re creating a new block that rewrites that part of the tree, and the rest of the network has to replay the change. It’s a neat trick for a distributed library, but the overhead of constantly updating the “order” would choke the network. So yeah, you could do it, but it would be a battle between the orderliness of Dewey and the wild, self‑healing nature of a true decentralized system.