Hà Anh Tuấn (born December 17, 1984) is a Vietnamese male singer. He became famous when he entered the top 3 of Sao Mai điểm hẹn singing contest. Biography Hà Anh Tuấn was born in Ho Chi Minh City.
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 0x5a0deebe39b5eb47f47a4c8ca85dc6685b34ddbb0cffe643a9e57a193934fafc. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/765cc4a5-6a24-4fba-bfba-5c37b22c25b8.json and https://artists.proofprofile.net/proofs/artist/765cc4a5-6a24-4fba-bfba-5c37b22c25b8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).