thumb|In the Senne in about 1860 thumb|alt=an elderly grey horse|In the Moosheide nature reserve, 2016 The Senner or Senne is an endangered German breed of riding horse. It is believed to be the oldes
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 0xec5693d37a109202bdf0de7ec8334997c82c7a31616b35b4410886817402d1b3. Chain 2 (Bitcoin): anchored in block 953924 (2026-06-16T09:52:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1d5a450f-de85-4641-b59a-a550583dc2f0.json and https://artists.proofprofile.net/proofs/artist/1d5a450f-de85-4641-b59a-a550583dc2f0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).