thumb|Cheba Maria Khadija Zine, commonly known as Cheba Maria, is a Moroccan singer and songwriter of Raï music. Born in Casablanca, she is based in Toulouse, France. Cheba Maria grew up in a cultur
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 0xa40b3a3cde23a7a99337edece38c7e4dbf96c427d2ab8b4f26e6374eaa921193. 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/b6a17ae2-da18-482d-b5c0-9a734a41faac.json and https://artists.proofprofile.net/proofs/artist/b6a17ae2-da18-482d-b5c0-9a734a41faac.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).