David Nathan may refer to: David Nathan (journalist) (1926–2001), British journalist David Nathan (music writer) (born 1948), British music writer specialising in soul music David G. Nathan (born 192
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 0xb58104b64106a2e4144f65bff330bbe770bf6681a9beb0982d81cbc2767f3481. Chain 2 (Bitcoin): anchored in block 953857 (2026-06-15T23:34:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0310a7b5-e9e4-4e59-bd18-576fd08fe9e9.json and https://artists.proofprofile.net/proofs/artist/0310a7b5-e9e4-4e59-bd18-576fd08fe9e9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).