Knut Riisnæs (13 November 1945 – 22 July 2023) was a Norwegian jazz musician (saxophone and flute), arranger, and composer, son of pianist Eline Nygaard Riisnæs and brother of classical pianist Anne E
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 0xada683a73d2ff0ccaada9f7fd422b233577a8be9d7f1f888b5893fe405dfc170. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fc1504d7-6385-4f0f-bde1-a9222a5c3c93.json and https://artists.proofprofile.net/proofs/artist/fc1504d7-6385-4f0f-bde1-a9222a5c3c93.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.