Thái Hòa is a town of Nghệ An Province, in the North Central Coast region of Vietnam. It was established in November 2007 on the basis of Thái Hòa townlet (thị trấn Thái Hòa) and seven communes for
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 0xe9db534b2f74ace88abe8e314abd274df60ece322a681c6b09e38a9af83d298f. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ea2c57cd-6ff4-4099-8035-11b9ebf804e0.json and https://artists.proofprofile.net/proofs/artist/ea2c57cd-6ff4-4099-8035-11b9ebf804e0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).