thumb|Zygmunt Stojowski and Ernest Schelling on May 18, 1917, for the funeral of Guillaume Stengel Ernest Henry Schelling (July 26, 1876 – December 8, 1939) was an American pianist, composer, and co
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 0xee9db6fa6980e86701f2819df04ae0d02605f64478fd96b7fb6fe81adee00b58. Chain 2 (Bitcoin): anchored in block 953864 (2026-06-16T00:30:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/03fb3e6f-7b29-41c9-9e1c-40d72b22c185.json and https://artists.proofprofile.net/proofs/artist/03fb3e6f-7b29-41c9-9e1c-40d72b22c185.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).