Matthew Tan is a Singaporean musician and bandleader. He has led Matthew and the Mandarins in its various forms since the 1960s. He is also the co-composer of the hit songs "Singapore Cowboy" and "Let
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 0x581f93ffcb042c6748b1a41649cbc54ac9ba7c5f7eec87701336f64cba8a8976. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b04b16a1-e9b2-4c79-949f-3806bbea9345.json and https://artists.proofprofile.net/proofs/artist/b04b16a1-e9b2-4c79-949f-3806bbea9345.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).