Horst Laubenthal (born 8 March 1939), real name Horst Neumaier, is a German operatic tenor and academic voice teacher. He is known internationally, both as an opera singer especially in Mozart roles s
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8709459a5f00895f000c9f9575dff10ea477e4532dff856ae42afd638744b030. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/27fcd8a0-9fe7-48e6-8f5f-b92f4b597111.json and https://artists.proofprofile.net/proofs/artist/27fcd8a0-9fe7-48e6-8f5f-b92f4b597111.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).