Friedrich "Fritz" Karl Otto Wunderlich (26 September 1930 – 17 September 1966) was a German lyric tenor, famed for his singing of the Mozart repertoire and various lieder. Biography Wunderlich was bo
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 0x55530c8c1e013b3e3c047535c197bcd2056f451e683f414eae38139def290ee1. 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/df236234-6a58-4b8a-8470-d984ecb76587.json and https://artists.proofprofile.net/proofs/artist/df236234-6a58-4b8a-8470-d984ecb76587.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
R. Strauss: Capriccio, Op. 85, TrV 279 (Excerpts) [Live]
Handel: Giulio Cesare in Egitto, HWV 17 (Sung in German)
Mozart: Die Entführung aus dem Serail, K. 384 (Live)
Richard Strauss: Der Rosenkavalier, Op. 59, TrV 227 [Recorded 1961]
Mozart: Entführung aus dem Serail - Highlights
Fritz Wunderlich: Arias from the 20th Century (Live)
Verdi: La traviata - Highlights (Sung in German)
R. Strauss: Die schweigsame Frau, Op. 80, TrV 265
Beethoven, Brahms, Schubert & Others: Lieder
Verdi: La traviata (Bayerische Staatsoper Live)
Wunderlich, Fritz: Legend (The) - Arias, Opera and Operetta Scenes and Songs
Fritz Wunderlich - Der große deutsche Tenor
Vocal Recital: Wunderlich, Fritz - Kaiser, E. / Georgy-Engelhardt, G. / Katt, M. / Hasenpflug, C. / Berner, H. / Kowalski, L. (1953-1956)
Fritz Wunderlich - The 50 Greatest Tracks
Lortzing: Der Wildschütz (Recorded 1958) [Live]
Le prince des ténors (Les indispensables de Diapason)
Wunderlich: Opernarien (Bayerischer Rundfunk 1961-1966) [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 0x891094a0adc7525067be2dcb583e26009be9abae72d9131507f3580b0797c026. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DETL61600472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7193b25b2da9ed42c93dc98acc8229d2551bbf1364563f5eab3d1c4e53a1075. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DETL61600476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996df07b63c568c188270f8a5b83e58b89674ec898411be5b884f741c69dfa25. 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/DETL61600486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65840d5798010d1cd6338371d2d9acef9484476ee175110d23deafefc011388f. 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/DETL61600491.
Trinke, Liebchen (Glücklich ist, wer vergisst)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea2107ddf460e75b01f0f0442071294cd5986a29781f7ca1ba387a8d79a3f86c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DETL61600495.
Cherubini: Der Wasserträger (Sung in German)
Egk: Die Verlobung in San Domingo (Live)
Die Zauberflöte, K. 620, Act I: No. 1, Zu Hilfe! Zu Hilfe!
Mozart: Die Zauberflote K620 - Highlights
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe525cde8b46d40cbcd4d4f0ce6220bbc38edea729f4d6d8273d335ce8596b37. 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/DEF056430602.