thumb|David at the Bargello in Florence Donato di Niccolò di Betto Bardi ( – 13 December 1466), known mononymously as Donatello (; ), was an Italian sculptor of the Renaissance period. Born in Floren
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 0xd71c7c157afbb9bb61d7a48ea0620b6ad3a73d4751863ff913b15304e07c29f3. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/67d210fd-b917-42e4-9dd7-7f751477a07b.json and https://artists.proofprofile.net/proofs/artist/67d210fd-b917-42e4-9dd7-7f751477a07b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Torima Champagne (feat. Leon Fanourakis)