thumb|Keilberth photographed by Avraham Pisarek, 1945 Joseph Keilberth (19 April 1908 – 20 July 1968) was a German conductor who specialised in opera. Career Keilberth began his career in the State
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 0x733150efba3fd720845487706a8816745c8a1240a006f19ddd024452a3d32902. 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/596a3c73-ebb8-41fc-a3f0-275de53fbc7a.json and https://artists.proofprofile.net/proofs/artist/596a3c73-ebb8-41fc-a3f0-275de53fbc7a.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
475 Jahre Sächsische Staatskapelle Dresden (Live)
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 0x72f7b71d051cee8b4d41637f839680a6d1efd6d877d891dbd316fcff2e3e36d9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEAD62307041 — a six-check JSON result.
Reger: Eine Ballett-Suite, Op. 130 & Variations and Fugues on Themes by Hiller and Mozart, Op. 100 & 132
Reger: Eine Ballett-Suite, Op. 130: V. Valse d'amour. Sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d4346600a7eb5a2b2fe103e8e4e1078319d6da10aedcfcf9a3a8e389a58cb2. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEA806210605 — a six-check JSON result.
Weber: Der Freischütz (Les indispensables de Diapason)
Brahms: Symphony No. 1 in C Minor, Op. 68: I. Un poco sostenuto - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1541578456978d7202024131406c00361a48dc9ee9c1a293a757520f04e1b0ce. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBAYC0900754 — a six-check JSON result.
Brahms: Piano Quartet No. 1 in G Minor, Op. 25: IV. Rondo alla zingarese. Presto (Orch. Schoenberg)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d94e4338119de141714258dec4b0b6a55bca4d4799fe4626283c594d927b8e. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/GBAYC0903345 — a six-check JSON result.
Brahms: Violin Concerto in D Major, Op. 77: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x738d71f5c8ebf8765f22ca25a5915408d26002bb9c2d984afa31f0692a9cf61e. 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/DEC629502797 — a six-check JSON result.
Kaminski, Schwarz-Schilling, & Höller: Orchestra Works
Wagner: Siegfried, WWV 86C & Parsifal, WWV 111 (Excerpts) [Live]
Mozart, Beethoven & Others: Piano Concertos (Live)
The Symphony Lounge, Vol. 10: Mozart Symphonies Nos. 40-41 & Eine kleine Nachtmusik
Schubert, Berg & Bruckner: Orchestral Works (Live)
More Piano Giants: Annie Fischer, Vol. 8 (1958)
R. Strauss: Arabella, Op. 79, TrV 263 & 4 Letzte Lieder, TrV 296 (Live)
The Romantic Aspect in German & Australian Classics (Live)
Milestones of a Legend - Georg Kulenkampff, Vol. 5 (1941, 1948)
Beethoven & Brahms: Works for Piano (Live)
C. P. E. Bach - L. van Beethoven - J. Brahms, Concert du 25/09/1962, Orchestre National de la RTF, Joseph Keilberth (dir), Whilhelm Backhaus (piano)
Opernszenen, Vol. 1: Dietrich Fischer-Dieskau 1965-1976
Mozart, Einem, Wagner & R. Strauss: Opera Arias
Richard Strauss: Salome, Op. 54, TrV 215 (Bayerische Staatsoper Live)
R. Strauss: Die ägyptische Helena, Op. 75 (Live)
Mozart: Symphony No. 40 in G Minor, K. 550 - Brahms: Symphony No. 2 in D Major, Op. 73
Janáček: Výlety páne Brouckovy, JW I/7 (Sung in German) [Bayerische Staatsoper Live]
The Great Violin Concertos Recorded in Berlin
Joseph Keilberth: Rare Recordings (1943-1957)
Die Zauberflöte (The Magic Flute), K. 620
Hindemith: Cardillac; Mathis der Maler (Excerpts)
Verdi: Macbeth (Live Recordings 1950) [Sung in German]
Chorszenen und Konzertchöre in Rundfunkaufnahmen ab 1938
Die Meistersinger von Nürnberg, WWV 96: Silentium! Silentium!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925beb334e4510324cb2cbbc05be3a76e9342f2860b61c9f887212bfc3032cbd. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAD61703101 — a six-check JSON result.
Lohengrin, WWV 75 (Highlights): Gesegnet soll sie schreiten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e7f7a947768f8ce3d4fb1abb602183bbe7ed51d6a799af45f385a2961c7276. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEAD61703104 — a six-check JSON result.
Carmen, WD 31 (Highlights Sung in German): Diese Menge, im Gedrange!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004b915f359d5c4d95541434d2757870f19388669f5d230206090085b9b911cd. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEAD61703111 — a six-check JSON result.
Carmen, WD 31 (Highlights Sung in German): Habanera. Ja, die Liebe hat bunte Flügel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9d756f56b604565583ad0754228a90a7a0e4f49e53cd1b027e8dab368545ee4. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAD61703114 — a six-check JSON result.
Wagner: Der Ring des Nibelungen, WWV 86 (Remastered 2021) [Live]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb79dd0d3a21ef6c892451608f9ba14cb5a88cf3df73c4c90b5f0b4c9de7effd3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/US2TL0945001 — a six-check JSON result.
Die Zauberflöte, K. 620: Act I: Arie: Der Vogelfanger bin ich ja (Papageno)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ee81aaa65ba1f62accb6f069d633838c5cf71195227d7dd9927285eaf8c67a. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/US2TL0945005 — a six-check JSON result.
Die Zauberflöte, K. 620: Act II: Terzett: Seid uns zum zweiten Mal willkommen (Drei Knaben)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319c4a529b6b2fc3158b358a6ba7b1d84933620c037f17ff15e35a871f097595. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/US2TL0945033 — a six-check JSON result.
Die Zauberflöte, K. 620: Act II: Finale: Bald prangt, den Morgen zu verkunden - Der, welcher wandert - Papagena! Papagena! Papagena! - Nur stille! Stille! Stille Stille!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48fbe584a5d3ea8a517534e17e58adc79ffa802fae92a0e69ee887fffacf73b. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/US2TL0945043 — a six-check JSON result.
Beethoven: Symphony No. 5 in C Minor, Op. 67: I. Allegro con brio
Philharmonisches Staatsorchester Hamburg
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b8be4297b5acfdafd1fdc14995442f61769e138fe9cbe394b5b420aedf0af2. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DEA805800101 — a six-check JSON result.
Klassik 100 Meisterwerke: Klassik die man gehört haben muss
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9950e396879aa0330fe97a25ea12968e94270f35b820b0e71f944e7d8239a0f0. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEA349601680 — a six-check JSON result.