Friederike Sailer (20 February 1920 – June 1994) was a German soprano in opera and concert. She was a member of the Stuttgart Opera, later a voice teacher at the Musikhochschule Stuttgart. She perform
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 0x9b4cecf447198b629d4b085c1757735c7099fcec3684809480f5d58de665678c. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cee4c3c0-d950-466b-8b23-941a0ab5859a.json and https://artists.proofprofile.net/proofs/artist/cee4c3c0-d950-466b-8b23-941a0ab5859a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Giuditta: Freunde, das Leben ist lebenswert
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec41d25ff32191fa9f164f0b6791030fed9a249d3ad4a41acd73278179a2c123. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191525002.
Traumland Der Operette - Raritäten (Folge 2)
Orchestra of the Württemberg State Opera
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b87c5ddb8beb96c64853f46ea6f20d2484976685bcddeea0d3c7b30a2d677e5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA580900462.
Ungarische Hochzeit: Heimat, Dein Lieder
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d576610ffc0db6414b37a8f7fc7ed0042023c6d4a78b561db571929440ae02d. 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/USZDG0900726.
Der Obersteiger, Act II: "Sei nicht bös'"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c03d07f6f0ed6a27eff189ee458ab9b41aeb39da4cd72055ed1f6d569df1f1. 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/USZDG0900717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dcdb569b004d4c7cd9cc4b6f364ac2b333a2b6dd878c82f6b550c4a6a11855a. 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/DEA580900461.
Die Lustige Witwe: Es waren 2 Königskinder/Ich geh jetzt ins Maxims
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a9cb3619511fbc8ecc6224009c7663356d28cc6d1f274ef752478e565dbcd1. 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/CAM460870147.
Im weissen Rössl, Akt III: "Mein Liebeslied muss ein Walzer sein"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816d3c9e3563dd512fec34341d0b2cf8ed80d960c6a125615b49ac1a676fc3ee. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAM460870123.
Die lustige Witwe: Wie die Blumen im Lenze erblüh'n/Ballsirenenwalzer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f1b5410ca55f570f58126e295ccfa73c4ac04413ef725bcdcfa5b192bc8d0ab. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAM460870145.
Gräfin Mariza: Wenn es Abend wird/Grüss mir die süßen, die reizenden Frauen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3d89c8751714dc7240ecff552e0b125d57dff3f95f34e15a066894925e42bd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAM460870143.
Gräfin Mariza: Ich warte auf das große Wunder/Machen wir's den Schwalben nach
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06804c9f7229486dde0d4322e4cad6c3391743d789ff4dbfb71e964aa7f375ea. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAM460870144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc41b74b88092aeab8d248e7049ac963ea248e8de95a663840310fcaf68132af4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA580800558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d1bd68a3c46622ee1b2bbc0e1f9cffec846b6b932ee7b3e8f02778f85866e0. 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/USZDG0900716.
Der Bettelstudent, Act II: "Ich setz' den Fall"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfdc6cacadd76cb3e5a777e58318c63caeca09742cac4d7c20b55b21ef5ad8e7. 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/DEA580900465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9893a730c3efd30c80be75afc40cc3f56c1f7894038c4846e7e9ef3b3c2391d0. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZDG0900725.
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
Vocal Recital: Wunderlich, Fritz - Kaiser, E. / Georgy-Engelhardt, G. / Katt, M. / Hasenpflug, C. / Berner, H. / Kowalski, L. (1953-1956)
Brahms: Zigeunerlieder, Op. 103 & Liebeslieder-Walzer, Op. 52 (Mono Version)
Rimsky-Korsakov: Das Märchen vom zar Saltan
Classical Chorus: Beethoven, Vivaldi & Purcell
Vivaldi: O qui coeli terraeque serenitas, Stabat mater & Gloria in D Major, RV 589 (Mono Version)
Bach : Oster-Oratorium, BWV 249 (Mono Version)
Les splendeurs de la musique sacrée, Vol. 5
Friederike Sailer / Choeurs de Radio Stuttgart et Orchestre Pro Musica de Stuttgart play: Michel Richard Delalande: De Profundis (Psaume 129), S 23
Friederike Sailer / Margarete Bence / Susi Lautenbacher play: Johann Sebastian Bach: "Kommt, eilet und laufet, ihr flüchtigen Füsse" - Oratorium zum Osterfest, BWV 249
Friederike Sailer / Susi Lautenbacher etc. / Stuttgarter Bach-Chor und Orchester / Marcel Couraud play: Johann Sebastian Bach: "Kommt, eilet und laufet, ihr flüchtigen Füsse" - Oratorium zum
Vivaldi: Gloria, Stabat Mater & O qui coeli terraeque serenitas
Bach: Cantates, BWV 8 & 110 (Stereo Version)
Beethoven: Egmont, Op. 84 (Mono Version)
Beethoven: Egmont, Op. 84 & Symphony No. 1, Op. 21 (Mono Version)
Brahms: Liebeslieder-Walzer, Op. 52 & 65 (Mono Version)
Choeurs et Orchestre Philarmonique "Pro Musica" de Stuttgart play: Antonio Vivaldi: Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a0ac94d94b9bae296633cff8367dd13e09a84ee358cb6b3dbd3660af50bbcd3. 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/QMVRR1301695.
Dixit Dominus, RV 594: IV. Tecum principium
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x704ddb7adfb23bd37120b06662850c4fac5f954daae521e676c8bf3cca3b5ee1. 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/USX760630329.
Dixit Dominus, RV 594: V. Juravit Dominus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b60a89f61977951a4d26f01f13bf6ab4019674ef7cd07bfda0161f52a287a6d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX760630330.
Dixit Dominus, RV 594: VIII. De torrente in via
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf34b7884552ddefcd790583d0e48d006ca81b756d8909444b9a93e55035367ba. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX760630333.
Johann Sebastian Bach Osteroratorium/Easter Oratorio
Osteroratorium, BWV 249/Easter Oratorio, BWV 249: Sinfonia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c62895c7964fd18c331a9806088f642b3311478c11582ed01d45d7fb6f78269. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEU240828379.
Osteroratorium, BWV 249/Easter Oratorio, BWV 249: Duetto & Chorus: kommt, Eilet Und Laufet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917b4c0d57f10e8c633d0ff1d85148d8bea1939dee1142e5322f66815575c1ca. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/DEU240828381.
Los Grandes de la Musica Clasica - Antonio Vivaldi Vol. 3