Hjalmar Borgstrøm (; 23 March 1864 – 5 July 1925) was a Norwegian composer and music critic who played a prominent role in the musical life of his country in the first quarter of the 20th century.Guld
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 0xa64a88912ab5dee0dfd670c1a7f4a1ba30ba156fffbbaedd922a33b53f6dd857. Chain 2 (Bitcoin): anchored in block 953877 (2026-06-16T02:39:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/078d1496-2e56-47fa-a83c-d1e30b2e9356.json and https://artists.proofprofile.net/proofs/artist/078d1496-2e56-47fa-a83c-d1e30b2e9356.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).