Joachim Bauer (born 21 October 1951 in Tübingen) is a German medical doctor with education in internal medicine, psychiatry and psychosomatic medicine. He teaches as a professor at the University of
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 0xef906efd3ed3ab2bb8dba599880c4427f4f21f9cb22782b0d8860399abe2a9bd. 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/744be74b-b26a-4b4a-bb7f-2796b316cfd5.json and https://artists.proofprofile.net/proofs/artist/744be74b-b26a-4b4a-bb7f-2796b316cfd5.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.