Bengt-Arne Wallin (13 July 1926 – 23 November 2015) was a Swedish jazz composer, arranger, trumpeter, and flugelhorn player who played jazz influenced by Swedish traditional folk music. He also wrote
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 0xa0129e719723feaef2708f865d2ef01c7714e6296350f1dfad7ae2db296217c2. Chain 2 (Bitcoin): anchored in block 953984 (2026-06-16T18:08:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c2df4a3-5c40-42af-bbe4-403c9919d771.json and https://artists.proofprofile.net/proofs/artist/2c2df4a3-5c40-42af-bbe4-403c9919d771.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Isn't It Romantic (with Rolf Blomquist's Orchestra)
The Birth and Rebirth of Swedish Folk Jazz