Sissel Kyrkjebø (; born 24 June 1969), also known abroad as Sissel, is a Norwegian soprano. She is considered one of the world's top crossover sopranos. Her musical style ranges from pop recordings an
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 0x231a7286ba945c540070f6cadf1fd3cfd8a7ec01ab2ea5268b8cfde7abfe6946. Chain 2 (Bitcoin): anchored in block 954035 (2026-06-17T02:39:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3dc1c864-1d21-4b97-91bd-5d963122b37b.json and https://artists.proofprofile.net/proofs/artist/3dc1c864-1d21-4b97-91bd-5d963122b37b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).