Heinz Hoppe (26 January 1924 – 7 April 1993) was a German lyric tenor in opera, lied and operetta, who performed internationally. A long-time member of the Hamburg State Opera, he appeared in world pr
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 0x84702d5a648ed45e46fdc686ec2f1d053d6fbf670548e48250e69889da3842b9. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1520b778-68f6-4e3a-a2eb-baa4bbaa83ba.json and https://artists.proofprofile.net/proofs/artist/1520b778-68f6-4e3a-a2eb-baa4bbaa83ba.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Orpheus in der Unterwelt: Introduktion (Öffentliche Meinung)
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 0x46bff63b50881ae25dab239dacd926aa3d8eba22f54b2bc0de4af5150226e2ce. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/DEHB51283704 — a six-check JSON result.
Orpheus in der Unterwelt: "Ein Weib, das Lieb' und Sehnsucht plagen" (Eurydike)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x372366a7a7449da1bb8423a3ba7609e61a3c72bb678f162898d3c17e2ffacd40. 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/DEHB51283705 — a six-check JSON result.
Orpheus in der Unterwelt: Abstieg in die Unterwelt. "Komm, folg'der Ehre" (Öffentliche Meinung, Orpheus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x857febee01f02c5e58ac323539e4ffdb51ff8f5817aed7e54a6059075b1bd328. 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/DEHB51283713 — a six-check JSON result.
Eine Nacht in Venedig - operetta in 3 Acts - 1923 Version by Erich Korngold and Ernst Marischka: Gondellied
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf815368a65be10cefcd8cac74cd5f1e4bf5a24dc09c02c8c832a948c49562003. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/DEF066904450 — a six-check JSON result.
Eine Nacht in Venedig - operetta in 3 Acts - 1923 Version by Erich Korngold and Ernst Marischka: Drum sei fröhlich, sei selig, Venezia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104192af6ec59f6aebd7f501f96d0ff85aa64975e6e4562771b6fec877c094dd. 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/DEF066918590 — a six-check JSON result.
Die Fledermaus / Act 1: Terzett: Oje, wie rührt mich dies
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc58cecd6cf561c59a0a67130f5b91ae0579b1334ce26790de4a457d072d63f. 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/DEF066804050 — a six-check JSON result.
Die Fledermaus / Act 3: Champagner hat's verschuldet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e055f1fff37bcf4144e2a7e621ac2526a420a2be603cb4d4f7e01a4ed025f45. 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/DEF066804230 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 1: Einleitung
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090c8a193963e2b49bd90d028efc68ae63e951f963a2cb43ff07b061dde96d10. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/DEF066814720 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 1: Wenn Beifall dieser Abend findet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696e1be377d7ce11803c0dd7228cadbfa7ec24aa1facb76edd8e0335c814b788. 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/DEF066810510 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 1: Ich bin eine anstän'dge Frau
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6af63e2f54d89cbd74c707723c5cf32ae9d3ebafaba79802bcea3d638d283a. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF066810520 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 1: Gar oft hab' ich gehört
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29270b8f443e78a9cfb09189b344909d6f7386c8654a6318946fd973d3ce2dd. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/DEF066810530 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 1: Da geh' ich ins Maxim
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfdff415334b3842940bfdbeab0ddf404c54f63ac2a5fc0f4e0537a9c0b1ff94. 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/DEF066810540 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 1: Polonaise und Ballett
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b1d6529159677fd51d789f678dab9fca702b8f4c07602dad990fed4038561c. 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/DEF066810550 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 1: Ballsirenenwalzer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf79d6f22a2c5089025869d50e50d3579ee8635a87231a8bb27d3ee8899d08dd1. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/DEF066810560 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 2: Vilja-Lied
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7affae36925812f91f9d91b273dbbc6d064c5bfc84ced4e050d40611dbebdfa. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DEF066810570 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 2: Weibermarsch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c5c091bba8967ae24ef13589ce5cc2e45be276468ef0b44b54d25ffb443c7c5. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DEF066810580 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 2: Lied vom dummen Reiter
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9e090c0178bd815f476deacad44027fd513f43d3d5982b17312c5f38a363aa. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEF066810590 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 2: Intermezzo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0f29375a947a5baf56e832e6894aa135342fa2c982a9e94f46951c04de22d0. 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/DEF066810600 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 2: Komm in den kleinen Pavillon
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498129ce205ae952fbd747166b927c7f3de77500b5779feec3b50caf430599c9. 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/DEF066810610 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 2: Es waren zwei Königskinder
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503e650d20e5f8f2658f20ae2388db40d0cf5a58a1288df9828c76c84c0c76eb. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF066810620 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 2: Walzer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b48a00c4bd1e6a6c8ec34f4cd77d754d1e82e68c5d4e807476c7147adcb9fc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF066810630 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 3: Grisettenlied
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ff2c8d3c3b454f2a71984463efd72c919b83e0816acdfbebc4002b6ce94a9c. 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/DEF066810640 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 3: Duett: "Lippen schweigen"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b4277a6b914be0a2b0804697f676276f8079136b08c81723fb68835166cb73. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF066810650 — a six-check JSON result.
The Merry Widow (Die lustige Witwe) / Act 3: Das hat Rass'
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc206e77fb089a24bfd3514bf70cb9564bfe430d2dc454f743dd2c697b58a6228. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/DEF066810660 — a six-check JSON result.
Gräfin Mariza - Operetta in 3 Acts: Höre ich Zigeunergeigen / Wo die Liebe wohnt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1d9b2bbfbb09287635fd04ac7983e29c67a2464e8e5e2b7c446e39039cdb03. 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/DEF066814700 — a six-check JSON result.
Gräfin Mariza - Operetta in 3 Acts: Juliska, Rosika, sagen dir "Grüß Gott"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc0af6117efc70f366f627d69f2931611278903a40945d2907a9611baf5e704d. 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/DEF066810690 — a six-check JSON result.
Gräfin Mariza - Operetta in 3 Acts: Ich möchte träumen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17d614ca1f1f739abfcc8bbcbb729f0baa3f0b3553fa57e7830e065af15c726. 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/DEF066810700 — a six-check JSON result.
Gräfin Mariza - Operetta in 3 Acts: Schwesterlein
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5277696ca8ffa45efa8446963cf30e5372ec8120fa2ae472695d913bdc11821e. 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/DEF066810750 — a six-check JSON result.
Gräfin Mariza - Operetta in 3 Acts: Sag' ja, mein Lieb', sag' ja
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d3dc886c64c33082a2e351fb92f3741d5e9c00bb51618a2ac8230acfecbbad. 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/DEF066810770 — a six-check JSON result.
Gräfin Mariza - Operetta in 3 Acts: Komm, Czigany
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c9a2cdeba94b164b8fbfc59bb340ec22198374b23827ac1715b16e02e521d8. 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/DEF066810800 — a six-check JSON result.
Lehár: Querschnitt durch die Operette Paganini (Stereo Version)
Boccaccio - Die Rose von Stambul - Der fidele Bauer
Der fidele Bauer: Jeder tragt sein Pinkerl
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedbd2e6bba2724d2998995cb3076df1c47a86d1be97325b2d40fb062b4cc955c. 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/DEF066608020 — a six-check JSON result.
Die Csardasfurstin (The Gypsy Princess), Act II: Duet: Tanzen mochte ich
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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAD61402501 — a six-check JSON result.