Vigan, officially the City of Vigan (; ; ), is a component city and capital of the province of Ilocos Sur, Philippines. According to the , it has a population of people. Located on the western coas
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 0x4b0f9ce4fbf7827a8a2ac97014b614fb1be57782db2553402af82a4ac0788921. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/feae8995-59c2-4d61-aa0e-7ba61fa28237.json and https://artists.proofprofile.net/proofs/artist/feae8995-59c2-4d61-aa0e-7ba61fa28237.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).