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 0xf57db0330a2118e836c409daebd580e02d311bf39412bb97709a8d33386ccfea. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fb3597af-11b2-4563-a314-b99d9a83fdd8.json and https://artists.proofprofile.net/proofs/artist/fb3597af-11b2-4563-a314-b99d9a83fdd8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Karl Schmitt-Walter, Vol. 1: Opera, Operetta and Song
Im Reich der Operette, Vol. 4 (Favoriten - Raritäten - Entdeckungen)
Im Reich der Operette, Vol. 3 (Favoriten - Raritäten - Entdeckungen)
Die Csardasfurstin (The Gypsy Princess), Act II: Duet: Tanzen mochte ich
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 0x5baf890912e3e068ac71483de1e52b516f11d66ca36e743d9107dcd72a273d64. 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/DEAD61402501.
Der Vetter aus Dingsda, Act I: Ich bin nur ein armer Wandergesell
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a8aaed1da2bc463c94cb114e2899a62e788da05eda950e43487024ae85dcde. 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/DEAD61402503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb5dcdad3e9f7e6bff6839dde9e60268a21743103257c0356af336d2270c6709. 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/DEAD61402504.
Die Csardasfurstin (The Gypsy Princess), Act II: Machen wir's den Schwalben nach
Northwest German Radio Symphony Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc24961964a5ec56a682ae1b55686614ca8afd43f9728350e2bb78dd08e2a58. 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/DEAD61402505.
Im Reich der Operette, Vol. 1 (Favoriten - Raritäten - Entdeckungen)
Man müsste Klavier spielen können” – Die schönsten Melodien von Friedrich Schröder in Originalaufnahmen (1937-1943)
Immer nur … Du!: Man musste Klavier spielen konnen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe8f7aa90f9099a780ed8a269571c5cef94ecac37f19cec0774821cbc4ccb0b. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEL111300097.
Dein ist mein ganzes Herz (Die schönsten Melodien aus Schlager, Tonfilm und Operette)
40 Most Beautiful Classical Masterpieces
Mozart: Serenade No. 13 in G Major, K. 525, "Eine kleine Nachtmusik: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ec958e1ba4981d0043b42429510f6be1f11d68a8065d6d325d893a3de6ba52. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ207310801.
Bach, JS: Herz und Mund und Tat und Leben, BWV 147: No. 10, Choral. "Jesus bleibet meine Freude"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcec4f5624f8cdef629205edfcdb8fe500459f40befc46df08184b137e93825c3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ209620105.
Vivaldi: The Four Seasons, Violin Concerto in E Major, Op. 8 No. 1, RV 269 "Spring": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0869e3182cd3c98eb17a8128c58938596dcb181dad02ce3c24f32cfc71098cc7. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/FRZ207100502.
Elgar: 5 Pomp and Circumstance Marches, Op. 39: No. 1 in D Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843024d3203a326c8f063a3a114fa5b48b5e84875b8f34e497ce0bf3c12fe2d1. 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/DEA809105701.
Grieg: Peer Gynt Suite No. 1, Op. 46: I. Morning Mood
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c031f22d7f4c3487dbda71a779396838f125e97af23c3b725e98fd1fc35cfdb. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208302900.
Saint-Saëns: Le carnaval des animaux, R 125: XIII. Le cygne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a6bf5d8372277931dff73256c6dfd8b4f3116aa2522df511c6aedc450836e8. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA809001401.
Tchaikovsky: 1812 Overture in E-Flat Major, Op. 49 (Excerpt)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf27789cfc6f248f7dac87ca6f0fc7d503d620f5488886055524a58f136bb85cf. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA809220502.
Wagner : Lohengrin : Act 3 "Treulich geführt ziehet dahin" [Chorus]
Chor und Orchester der Deutschen Oper Berlin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dda0dc8f12657c70d7fa81c8841fc2b1e3cc6feba65e3a4654ff3ba2b984663. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DEA800300367.
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
Karl Schmitt-Walter, Vol. 2: Popular Songs and Film
Im Reich der Operette, Vol. 2 (Favoriten - Raritäten - Entdeckungen)
Lehár: Das Land des Lächelns & Other Operetta Excerpts
Wagner: Choruses from The Flying Dutchman & Lohengrin
Handel: Largo - Massenet: Méditation de Thaïs - Gounod: Ave Maria - Single (Mono Version)
Wagner, Verdi: Chœurs d'opéras célèbres (Mono Version)
A Johann Strauss Celebration - Telefunken Legacy
Im Reich der Operette, Vol. 9 (Favoriten - Raritäten - Entdeckungen)
Glückliches neues Jahr (Die schönsten deutschen Lieder um ins neue Jahr zu starten)
Bizet: Les pêcheurs de perles (Sung in German) [Recorded 1950]
Weber: Pages célèbres du Freischütz (Mono Version)