Hash, hashes, hash mark, or hashing may refer to: Substances Hash (food), a coarse mixture of ingredients, often based on minced meat Hash (stew), a pork and onion-based gravy found in South Caroli
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1331949e8d080fa9e9644de43bc1737d6bb0586097c4dcca449f34cb1a79c0d6. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4dd8d4d7-25b3-4c89-b622-523402d4759d.json and https://artists.proofprofile.net/proofs/artist/4dd8d4d7-25b3-4c89-b622-523402d4759d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).