David Kurnia Albert Dorfel, usually referred to as David Noah, is an Indonesian musician. He is the keyboardist of Indonesian rock band Noah since 2008 after becoming their additional musician in 2006
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 0x2a3b89a24e86fa840da24e3e86c73d9160fdd818f006b1708d83647e46cd41fe. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a220f93e-3944-4e42-b7af-aae35edb957b.json and https://artists.proofprofile.net/proofs/artist/a220f93e-3944-4e42-b7af-aae35edb957b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).