thumb|Kåre Opdal, Eva Knardahl, (conductor) (l-r) (1970) Eva Knardahl Freiwald (10 May 1927 – 3 September 2006) was a Norwegian pianist, with a noted career both as a child prodigy and adult performe
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 0x1dd959c2c76a799228da513707460f6b913ff98f9ca0296241e5ae44da66a31d. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c3c02d26-7670-4066-89ca-d345bd15a3ae.json and https://artists.proofprofile.net/proofs/artist/c3c02d26-7670-4066-89ca-d345bd15a3ae.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rimsky-Korsakov / Beethoven: Piano Quintets / Berwald: Piano Quartet
Great Norwegian Performers 1945-2000, Vol. Ii