Nuri is a place in modern Sudan on the west side of the Nile, near the Fourth Cataract. Nuri is situated about 15 km north of Sanam, and 10 km from Jebel Barkal. History Nuri is the second of three N
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 0x60bb6b99ad4e292cc540ff0e5c03bbdb245211b659146517984a2645fe6854e3. 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/d106834a-c61b-4146-aa26-840d6943c482.json and https://artists.proofprofile.net/proofs/artist/d106834a-c61b-4146-aa26-840d6943c482.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).