Naqa or Naga'a (; ) is a ruined ancient city of the Kushite Kingdom of Meroë in modern-day Sudan. The ancient city lies about north-east of Khartoum, and about east of the Nile River located at appr
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48cbcfecb6da40a9de451a887fb28cee5c39deab2cff5f24088a89f52f105cbf. Chain 2 (Bitcoin): anchored in block 953958 (2026-06-16T14:52:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/265cd713-7ab1-4b33-b0dc-ae610f9e99e1.json and https://artists.proofprofile.net/proofs/artist/265cd713-7ab1-4b33-b0dc-ae610f9e99e1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).