Magnum Bonum was a pop group from Huddinge in Sweden, scoring several chart successes in Sweden during the 1970s and 80's. Famous songs are Skateboard (LA Run), Marie, Lover Boy, Vi vill ha mer, Hög h
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04cc76d1c8fa90e47e29b727396c0c31f82e03f3496b20d5a1ffb8c56b3c666. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9426811a-2360-4236-beaf-c0ff8072eefe.json and https://artists.proofprofile.net/proofs/artist/9426811a-2360-4236-beaf-c0ff8072eefe.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).