thumb|262px|"Hours of anguish" (Julio Romero de Torres, 1904). Anguish (from the Latin angustia "distress") is "extreme unhappiness caused by physical or mental suffering.""anguish". Cambridge Dictio
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c0177d6c44d67688f340a90b3efed9e98dcd4c3b2298e870250017358994f86. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2ef50c36-f4c3-4925-9122-0f2e6e0455de.json and https://artists.proofprofile.net/proofs/artist/2ef50c36-f4c3-4925-9122-0f2e6e0455de.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).