Günter Kehr (16 March 1920 – 22 September 1989) was a German violinist, conductor and academic teacher of violin and chamber music. He founded the Kehr Trio, a string trio, and the Mainzer Kammerorche
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 0x9a2f8f8cd3a667727f0195e051e456d5298a7a513f219f663011b6add70be343. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/413b1427-c942-4d6a-aab4-226655cdae2d.json and https://artists.proofprofile.net/proofs/artist/413b1427-c942-4d6a-aab4-226655cdae2d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Classical Masterpieces - George Frideric Handel: Music for the Royal Fireworks & 6 Concerti grossi No. 1
Orange Edition - Mozart: Symphony No. 8, K. 48 & Violin Concerto No. 2, K. 211
Orange Edition - Mozart: Symphonies Nos. 8, 9 & Violin Concerto No. 3, K. 216
Green Edition - Mozart: Symphonies Nos. 8, 9 & Violin Concerto No. 4
Blue Edition - Locatelli & Corelli: L'arte del violino, Op. 3 Nos. 11, 12 & 12 Concerti grossi, Op. 6, Nos. 4, 8
Blue Edition - Locatelli & Corelli: L'arte del violino, Op. 3 Nos. 11, 12 & 12 Concerti grossi, Op. 6, No. 10, 11
Green Edition - Scarlatti & Locatelli: Keyboard Sonatas & Concerti grossi
Green Edition - Scarlatti & Locatelli: Keyboard Sonatas & 12 Concerti grossi à 4 e à 5, No. 2
Brandenburgische Konzerte No. 5 und 6, Orchestersuite No. 4
Green Edition - Mozart: Symphonies Nos. 33, 8 & 9
Green Edition - Mozart: Symphonies Nos. 8, 9, 31 & 32
Green Edition - Mozart: Symphonies Nos. 7, 33 & 55
Green Edition - Mozart: Symphonies Nos. 7, 31, 32 & 55
Blue Edition - Mozart: Symphonies Nos. 5, 6, 8, 9 & "Old Lambach"
Blue Edition - Mozart: Symphonies Nos. 5, 6, 7, 55 & "Old Lambach"
Blue Edition - Mozart: Symphonies Nos. 1, 4, 8 & 9
Blue Edition - Mozart: Symphonies Nos. 1, 4, 55 & 7
Mozart: Symphonien No. 47, No. 12, No. 42 und No. 10
Red Edition - Mozart: Symphonies Nos. 27, 30 & 45-46
Symphony No. 30 in D Major, K. 202: III. Menuetto
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 0x1a71eca1b26b06c1fc75e3b3e7fdd5454fcccdcc800bc6b4dc34794969598ebc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DE0851511579.
Red Edition - Mozart: Symphonies Nos. 11, 27 & 44
Red Edition - Mozart: Symphonies Nos. 44, 11, 27 & 30
Red Edition - Telemann: Tafelmusik Pt. 2 & Overture-Suites
Blue Edition - Bach: Organ Concerti & Orchestral Suites
Red Edition - Mozart: Symphony No. 31 "Paris Symphony" & Piano Concerto No. 8 "Lützow"
Red Edition - Mozart: Symphonies Nos. 32, 33 & Piano Concerto No. 8, K. 246
Green Edition - Fauré: Piano Quartets No. 1 & 2
Green Edition - Fauré: Piano Quartet No. 1, Op. 15 & Pelléas et Mélisande, Suite, Op. 80
Orange Edition - Mozart: Symphonies Nos. 45, 46 & Violin Concerto No. 5, K. 219
Orange Edition - Mozart: Symphonies Nos. 45, 46 & Violin Concerto No. 4, K. 218
Red Edition - Bach: Orchestral Suites Nos. 2, 3 & Violin Concerto No. 2, BWV 1042
Red Edition - Bach: Orchestral Suite No. 2, BWV 1067 & Concerto for 2 Violins, BWV 1043
Blue Edition - Fauré: Piano Quartet No. 2, Op. 45 & Piano Quintet No. 1 with Strings
Blue Edition - Mozart: Symphonies Nos. 32, 33 & Violin Concerto No. 5, K. 219
Blue Edition - Mozart: Symphonies Nos. 32, 33 & Violin Concerto No. 4, K. 218
Green Edition - Handel: Concerti grossi, Op. 3, Nos. 4-6 & Water Music Suite Nos. 2-3
Green Edition - Handel: Concerti grossi, Op. 3, Nos. 4-6 & Water Music Suite No. 1, HWV 348
Green Edition - Mozart: Symphonies Nos. 8, 9 & Violin Concerto No. 5, K. 219
Classical Selection - Handel: Concerti grossi Nos. 1 - 6, Op. 3
Green Edition - Bach: Overture in the French Style, BWV 831 & Orchestral Suite No. 1, BWV 1066
Locatelli: L'arte del violino, Op. 3, Concerti Nos. 7 & 8 (Mono Version)
Locatelli: L'arte del violino, Op. 3, Concerti Nos. 5 & 6 (Mono Version)
Locatelli: L'arte del violino, Op. 3, Concerti Nos. 2 & 3 (Mono Version)
Mozart: Eine kleine Nachtmusik, K. 525 & Ein musikalischer Spaß, K. 522
Symphony No. 29 in A Major, K. 201: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48d3d7f4860ed0d20b71a3ef73fad24c5288759dee8f53a2b266d7efed43ca23. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZDG0601190.
Württemberg Chamber Orchestra Heilbronn, Günter Kehr & Douglas Haas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb33a53524ad8a39f34bd108c964c799ef6319d8c548be713d5c080703e93b3c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZDG0600002.
Symphony No. 25, K.183, I. Allegro con brio
Uplifting Classical - Music to energize your mood
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc715a9dbabb2fe7be2831aad4dbfcb1fd94bf8237f2c18f89d02e219b3d750e. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZDG0600628.
Suite No. 3 in D Major for Orchestra, BWV 1068: II. Air
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0855a1d2c025086c45378fb3069c28b97536281d41ebeebfce8447696e7255. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZDG0600527.
Concerto No. 1 in C Major for Recorder and Strings, TWV 51:C1: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbcea2ae7040b7838838e30f2a891894e8f9aee0419ad5d82e5241a82a46c971. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0769004.