Ahmed Zergui (El Abbassi) (Arabic أحمد زرقي) (born 1948 in Sidi Bel Abbès, Algeria – 27 November 1983 in Tenira, Algeria) was an Algerian raï singer-songwriter. He was a pioneer in introducing the Wa
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 0xdb2cb7d8a44b8f79f4f3eb73db4944a5b1d751f65f3a7de1829100dbb710e7cf. Chain 2 (Bitcoin): anchored in block 954062 (2026-06-17T07:39:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4699e313-4676-4988-b5e9-fe034e597f13.json and https://artists.proofprofile.net/proofs/artist/4699e313-4676-4988-b5e9-fe034e597f13.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.