David Christensen is an Alberta film director and producer who since October 2007 has been an executive producer with the National Film Board of Canada (NFB) at its Northwest Centre, based in Edmonton
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18cd95101c238d8ece54b56a6c25c89b20d2e7248391886b0acc14d2b3419baf. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/707f8146-3058-417b-bf45-4ff9f3be035f.json and https://artists.proofprofile.net/proofs/artist/707f8146-3058-417b-bf45-4ff9f3be035f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).