Dirk Kaftan (born 1971) is a German opera and concert conductor. Career Born in Marburg, West Germany, Kaftan grew up in Wittlich and Canada. At the age of 18 he began employment as a repetiteur at
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 0xb470c2523ea93ede2e31b35efad07724253991dd7f8889b99c6ceb59dc793cb4. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7b89e697-7353-4911-9638-02acd3b8ac7d.json and https://artists.proofprofile.net/proofs/artist/7b89e697-7353-4911-9638-02acd3b8ac7d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.