Sivert Høyem (born 22 January 1976) is a Norwegian musician, best known as the vocalist of the rock band Madrugada. After the band broke up following the death of Robert Burås in 2007, he has enjoyed
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 0x45b4d61462283bcbd0e84e3a5e95425701239044c61d360be1a6b946d16bf1a7. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0bd9a624-7830-4d5b-8b1a-d33ff7f2700f.json and https://artists.proofprofile.net/proofs/artist/0bd9a624-7830-4d5b-8b1a-d33ff7f2700f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).