thumb| thumb|Painting by Konstantin Korovin, 1906 thumb|Another view by Korovin The Café de la Paix () is a famous café located on the northwest corner of the intersection of the Boulevard des Capucin
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 0xa1fc288fe73e9845b646f18b68fe8613b9f87b2daae06bff0505834363933bb3. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/99a4e49d-bd60-4b3b-ae99-692a18ad8a0c.json and https://artists.proofprofile.net/proofs/artist/99a4e49d-bd60-4b3b-ae99-692a18ad8a0c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).