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17 sats \ 0 replies \ @rijndael 12 Nov 2022 \ on: Really cool use case of OP_RETURN in BTC Blockchain bitcoin
Cool! Check out opentimestamps. Batches up document digests into a merkle tree and commits the root in a block. Means its free to use because it can timestamp thousands of documents/files in a single transaction. And there's a command-line client!