The mazhar (; : mazāhar, مزاهر) is a large, heavy tambourine used in Arabic music. The mazhar's frame is generally made out of wood. Its single head is considerably thicker than that of the riq, its s
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 0x893db2db6d6af6fe2853dcb261e1a23624c14e1c8b7cc984fffd58c1480a8f03. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e8a52902-ef6b-4588-9cfa-62ff1daaef45.json and https://artists.proofprofile.net/proofs/artist/e8a52902-ef6b-4588-9cfa-62ff1daaef45.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.