thumb|right|200px|Danone brand logo, used since 2004 Danone S.A. () is a French multinational food-products corporation based in Paris. It was founded in 1919 in Barcelona, Spain. It is listed on Euro
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 0xe5ff46e14026156bfcab1b3ccb4f0c9a10205675ffe5d0ed1a7e0e173db35feb. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/52a3b2c9-239c-4419-898a-f0b5a331de52.json and https://artists.proofprofile.net/proofs/artist/52a3b2c9-239c-4419-898a-f0b5a331de52.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).