thumb|The Demer and its tributaries in the south of the province of Limburg The Demer is an long river in eastern Belgium, and a right tributary of the Dijle. It flows through the Belgian provinces L
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 0xfce43c19cf28213d22b245a1349251d76c78c113e74f7b7f41be2876061bef90. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bbf68aa1-10fd-4c94-b24a-fe84bf9726fc.json and https://artists.proofprofile.net/proofs/artist/bbf68aa1-10fd-4c94-b24a-fe84bf9726fc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).