thumb|Front row from left: Bertil Frylmark, Norin himself and Ingemar Eriksson. Behind them Simon Brehm. Carl-Henrik Norin (27 March 1920 – 23 May 1967) was a Swedish jazz saxophonist. Norin was born
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 0x579e394014ad2ea7c21e232e4d07515381f02261abfb02898dcfcb821caae9dd. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/811287e9-bf9d-4967-a5ce-5de9e65f1da3.json and https://artists.proofprofile.net/proofs/artist/811287e9-bf9d-4967-a5ce-5de9e65f1da3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).