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 0x50a154d6c0b0967ba87be0472f602ffa36dcc6e186011d41714f95a8c86df7bb. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d04cf35c-766f-4a3e-b973-e1cd4907d15e.json and https://artists.proofprofile.net/proofs/artist/d04cf35c-766f-4a3e-b973-e1cd4907d15e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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With every breath I repeat Thy Name - Mystical Songs and Traditional Folk Music of the Ismailis of Hindu Kush
Poets and Mystics of the Hindukush: The Spiritual Musical Tradition of the Ismailis
Hindukush: Traditional Chitrali Sitar Music from Northern Pakistan