The Sabri Brothers (Punjabi, ) were a musical band from Pakistan who were performers of Sufi qawwali music and were closely connected to the Chishti Order. The duo are considered among of the greatest
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 0xb0efbcd442920906719bdc23048041aae6f350096caa083a8f7f95e567482260. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a2d5278e-b2cb-432a-99ee-f038c40aca55.json and https://artists.proofprofile.net/proofs/artist/a2d5278e-b2cb-432a-99ee-f038c40aca55.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).