thumb|Knut Risan with actress Bente Børsum in 1958 Knut Risan (19 February 1930 – 1 February 2011) was a Norwegian actor. He was born in Trondheim, and made his stage debut at Nationaltheatret in 195
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 0x0e0ba80c60bbe1b8f352cf09ef3830c51756e52b7ad286a90402e18992fe9b60. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5c9a842d-8bc7-47eb-a6f2-e34735a37662.json and https://artists.proofprofile.net/proofs/artist/5c9a842d-8bc7-47eb-a6f2-e34735a37662.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).