Thomas Zehetmair (born 23 November 1961) is an Austrian violinist and conductor. thumb|Zehetmair, Stuttgarter Kammerorchester, 2020 Biography Zehetmair was born in Salzburg, and studied at the Salzb
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 0x0315c87ea0f15474db5641c6465821c04f77cb26ab98a0f6bde801b848fe7211. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f659c5c2-059b-4de0-88d6-7f9a8348d985.json and https://artists.proofprofile.net/proofs/artist/f659c5c2-059b-4de0-88d6-7f9a8348d985.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Mozart: Piano Concerto No. 19 KV 459 - Concerto for Flute & Harp KV 299 - Andante for Flute KV 315 - Horn Concerto No. 1 KV 412/514
Piano Concerto No. 19 in F Major, K. 459: I. Allegro
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0x7436ffd728dd92599757b12312f76ff848a06f014942b7af6e8d74b3c025b388. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X2300101 — a six-check JSON result.
Violin Concerto in E Major, BWV 1042: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x382246a1ebb1747ef06b8c95a830aeef8d65d5ff6718c249871b80ed037b0883. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331406819 — a six-check JSON result.
Violin Concerto in D Minor, BWV 1052: I. — (Reconstructed from the Harpsichord Concerto, BWV 1052)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e099e9c05e6dca495ccd9f5333e6d757474eacaeed016a33809aaa573b97ed. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331406825 — a six-check JSON result.
Violin Concerto in A Minor, BWV 1041: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c83e4873d2595d51d214ee360431937cec942a97bab41f010c9ac886572910. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331406823 — a six-check JSON result.
Concerto in D Minor for Two Violins, BWV 1043: II. Largo ma non tanto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6697de000e876fc5bf5bb7a57d5cebbdad8e337dd4ef657ede347983a3f11a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331406832 — a six-check JSON result.
Mozart: Violin Concerto No. 5 in A Major, K. 219 "Turkish": II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc2766a7acd4f48d012ba5d6d192a6b20f5f523a8b395c3f06c6f3ee1e7a110. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA809100169 — a six-check JSON result.
Wolfgang Amadeus Mozart: Schatten ung licht: Chapter 4: Im Tanzmeisterhaus (1773-1777)
Camerata Academica des Mozarteum Salzburg
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92384514bd829cf3ab8a5a5305b0e37ecb046fafd9b70c98cf49948ebd08c46. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELW71490604 — a six-check JSON result.