Xarb is a five-member band from Lahore, Pakistan. The band was formed in 2008 and achieved its current membership in 2011. The band received increased public attention in 2018, when they performed on
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 0xcb3fc201daa983729be6def8c9c7f982ef8d00e528574baacb36f5002b4d7dd3. Chain 2 (Bitcoin): anchored in block 954131 (2026-06-17T19:19:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7b991c37-c261-4b89-b1e9-3e615f4ebe30.json and https://artists.proofprofile.net/proofs/artist/7b991c37-c261-4b89-b1e9-3e615f4ebe30.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).