Nusrat Khan may refer to: Nusrat Khan Jalesari (died 1301), a general and nobleman from medieval India Nasir-ud-din Nusrat Shah Tughluq (r. 1394-1398), medieval Indian ruler Nasrat Khan (b. 1926),
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 0x9d57a05f09dd4ea02fc4bf3dca12080a8c05296b9f520d63c0745af35b3d4099. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dc287661-817f-4eaa-bd34-c3c8e05b1a3d.json and https://artists.proofprofile.net/proofs/artist/dc287661-817f-4eaa-bd34-c3c8e05b1a3d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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