The University Graduate Center (UNIK) was a research foundation at Kjeller in Norway up to 2016. University of Oslo tok over the operation from 1. January 2017.https://www.mn.uio.no/its/om/historie/ (
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 0x0a3a921c24ec8f57214439b82fa5652c675b6ad576bddafe4a7ba66034353b58. Chain 2 (Bitcoin): anchored in block 953895 (2026-06-16T05:46:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0fbc3704-1502-4434-984c-c2682a25c594.json and https://artists.proofprofile.net/proofs/artist/0fbc3704-1502-4434-984c-c2682a25c594.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).