Aswan ( , (, ), is a city in Southern Egypt, and is the capital of the Aswan Governorate. The city is among the oldest continuously inhabited cities, with its recorded history spanning over 2,600 year
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 0x08cf922a7d4534565c6c4e867ac0bc3d4fbdadf2c2fd971aa009063daa037775. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/351ff6c7-5585-4c81-9c5c-e9e67b2f61f4.json and https://artists.proofprofile.net/proofs/artist/351ff6c7-5585-4c81-9c5c-e9e67b2f61f4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).