Elisabeth Rethberg ( Lisbeth Sättler; 22 September 1894 – 6 June 1976) was a German operatic spinto soprano singer who was active from the period of the First World War through the early 1940s. After
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 0xf89e84b49b357f9d2cd226c4ba6e4794b4177a1d4a568850085123db7712a421. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/51905e70-6b03-4792-8872-3139148b6620.json and https://artists.proofprofile.net/proofs/artist/51905e70-6b03-4792-8872-3139148b6620.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Bizet: Carmen, WD 31 (Sung in German) [Live]
Vocal Recital: Gigli, Beniamino - Verdi, G. / Massenet, J. / Puccini, G. / Bizet, G. (Complete Collection of Opera Highlights, Vol. 3) (1930-1941)
Lebendige Vergangenheit - Giuseppe de Luca (Vol.2)
Verdi: Otello (Martinelli, Rethberg, Panizza)(1938)
Die Entführung aus dem Serail, K. 384: Welcher Kummer - Ach ich liebte
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 0x7c3322ef5e79711c6f4a033ed47544f5fe1771ee2f583cedda36dc73fb133e60. 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/DEB959539408 — a six-check JSON result.
Opera Arias (Tenor): Gigli, Beniamino (The Very Best of Beniamino Gigli) (1927-1946)
Lucia di Lammermoor: Act III: Tu che a Dio spiegasti l'ali
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x049902bc2fcb28e3ced63adee028ee33b951f0e9d1571f17f1aaa6ce37eb6ba6. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USB8U1007046 — a six-check JSON result.
Lucia di Lammermoor: Act II: Chi mi frena in tal momento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2f45f76c33a3cd67939da257bc52aa519a6af6553fa30540f352cf74e25e8f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USB8U1007047 — a six-check JSON result.
Carl Loewe zu Ehren - Aufnahmen von 1902 - 1970
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55af51b8186959adbf40b00068129d7a394334e65305498f5921b17ff26bea99. 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/ATP139623027 — a six-check JSON result.
Opera Arias (Tenor): Gigli, Beniamino - Donizetti, G. / Puccini, G. / Drigo, R. / Verdi, G. (Complete Collection of Opera Highlights, Vol. 2)
L'elisir d'amore (the Elixir of Love), Act I: Quanto e bella, quanto e cara!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba55a80ba688fae45c8bc1ca8b90815a517735f75098a3bb8d125de853f2950b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USB8U1004488 — a six-check JSON result.
Lucia di Lammermoor, Act III: Tombe degli avi miei … Fra poco a me ricovero
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc26f2072561b5e07d49371ec88aa6a050eb0db5a85dd2776194987df7a602883. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FRZ140301010 — a six-check JSON result.
Lucia di Lammermoor, Act II: Chi mi frena in tal momento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d3e11b01e930c1a824fe12a98d70afca8b77c5d5a254ca2c37ec4e0b6c77e8. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ140713050 — a six-check JSON result.
La forza del destino, Act III: Solenne in quest ora
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1214d038f622e73c33bb9e3057c45dd9797fac17727997388c10ea36d89346d. 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/FRZ140301170 — a six-check JSON result.
Martha, Act III: Ach so fromm (M'appari tutt'amor)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfec6c3a9a53e0fea8ac81981382a201cbc366f872984914f8b32e785bdd4453c. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/FRZ140714040 — a six-check JSON result.
Lebendige Vergangenheit - Giacomo Lauri Volpi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc55788a57aa8b17ebe9941ea67cbf549579bd35ac27fde8693e8e6ae1d87527. 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/ATP138801202 — a six-check JSON result.
Lebendige Vergangenheit - Friedrich Schorr
Missa Solemnis conducted by Arturo Toscanini
Lebendige Vergangenheit - Ezio Pinza (Vol. 2)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1835ae51af26e93a14fa9101cab1485b63f87f5d4cd259dcaf9b936fd685ac45. 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/ATP139408520 — a six-check JSON result.
Great Opera Singers / Elisabeth Rethberg Sings Verdi / Recordings 1921 - 1934
Un ballo in maschera: "Morro, ma prima in grazia"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a5773e752d8120d4efd1b0a7052c2cbd790370af5966212e7d5835dc7874e3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GRHR11012916 — a six-check JSON result.
„Fin de siècle" - Vocal Music by Grieg, Wolf, Wagner, Debussy -Vol.2
Lebendige Vergangenheit - Elisabeth Rethberg
Verdi & Mozart & Wagner: Great Voices of the Century - Sopranos Vol. 4
Elisabeth Rethberg (Recorded 1924 - 1930)
Great Singers Vol. 2 (Recorded 1903-1939)
Der junge Richard Tauber - Arien und Duette
Hugo Wolf: 1931 - 1938 Recordings, Vol. 2
Le Nozze di Figaro: Pinza, Rethberg, Sayao, Novotna live 1940 (Live)