Sabina Cvilak (born 8 July 1977) is a Slovenian operatic soprano, who has appeared internationally, mostly at opera houses in Europe and the United States. Her stage presence is noted in portrayals of
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 0x2400cb8c240c4112273cee1069a31eda83cb51521fb36841885703a29f969ff5. 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/0686de44-fe00-41ee-a691-e88639f47d2e.json and https://artists.proofprofile.net/proofs/artist/0686de44-fe00-41ee-a691-e88639f47d2e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).