Luísa Vilar Braamcamp Sobral (; born 18 September 1987) is a Portuguese singer and songwriter. She came to prominence in 2003 after finishing third in the first season of Ídolos, the Portuguese versi
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 0xc2729830f577e5c6d93011c4858c1604fa25d058c18699055ba7666ec468d555. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cf7fa542-991f-4518-a36c-75f655539360.json and https://artists.proofprofile.net/proofs/artist/cf7fa542-991f-4518-a36c-75f655539360.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).