Sirima Nicole Wiratunga (14 February 1964 – 7 December 1989), known simply by her first name Sirima, was a singer who sang in English and French. She was primarily known for her duet "Là-bas", recorde
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 0x4757a504f1b0a441e189433256f56a6c66709e0c986cebfd726c636c723f1f2e. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/acdd4cbf-f137-4eab-821d-793187d8d6b1.json and https://artists.proofprofile.net/proofs/artist/acdd4cbf-f137-4eab-821d-793187d8d6b1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).