Vinh () is a former city located in the North Central Coast region of Vietnam and was the capital city of Nghệ An province, Vietnam. Vinh also is an economic and cultural center of the country's North
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 0x87ff86072b9b7a224defe42062b23805c92cc7c0ed4327b29feab4bdfc9f0c5f. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/49ee3863-9785-4ef4-9a82-10a010a2c246.json and https://artists.proofprofile.net/proofs/artist/49ee3863-9785-4ef4-9a82-10a010a2c246.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).