Opan (, ) is a village in southern Bulgaria, part of Stara Zagora Province. It is the administrative centre of Opan Municipality, which lies in the southern part of Stara Zagora Province. The village
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 0xc0dd09897f4c336dea4a2e1c2f9e9395d81d787365d4f8ae3b07eb78a9aa47f7. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f7d5689a-6b5d-4bb9-854e-76c6410888e8.json and https://artists.proofprofile.net/proofs/artist/f7d5689a-6b5d-4bb9-854e-76c6410888e8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).