Duy () is a Vietnamese given name. Notable people with the name include: Đái Duy Ban (born 1937), Vietnamese scientist Đào Duy Từ (1572–1634), Vietnamese poet Duy Tân (1899–1945), Emperor of Vietn
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 0x299164a9a59cdfe6e5b5262fd454b7304b2e502e29619c2ed7ada53fd8f6af62. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a66d70d1-2a42-477f-9eaa-03a7b44af629.json and https://artists.proofprofile.net/proofs/artist/a66d70d1-2a42-477f-9eaa-03a7b44af629.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).