thumb|Image of Hans Fredrik Jacobsen Hans Fredrik Jacobsen (born 8 September 1954) is a Norwegian musician and composer, best known for his work with his wife, the traditional folk singer Tone Hulbækm
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 0x9d392faec6f42dff61fde8d9ed2519b0e2caa59b21c26eea48cb8c9d87ec0328. Chain 2 (Bitcoin): anchored in block 953709 (2026-06-14T23:31:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7ce6b568-ba85-47ae-a7ff-075cf4450732.json and https://artists.proofprofile.net/proofs/artist/7ce6b568-ba85-47ae-a7ff-075cf4450732.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).