thumb|Paul Schöffler, German operatic baritone, in the wardrobe during the Salzburg Festival 1947. Paul Schöffler (15 September 1897 – 21 November 1977) was a German operatic baritone, particularly as
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 0xf4667609f93115cafec37d212219fc5cfc1251f397ce79b5f97c83567cbd850d. 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/d83de96a-f601-4fca-8ced-c9d99a911342.json and https://artists.proofprofile.net/proofs/artist/d83de96a-f601-4fca-8ced-c9d99a911342.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Die Zauberflöte / The Magic Flute: Arie: Der Vogelfänger bin ich ja
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 0x68966e996d83f42297e7bfd17b97e063919029b44d8bfcd86980a4d82f69488b. 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/DEAD62142403.
Die Zauberflöte / The Magic Flute: Arie: Dies Bildnis ist bezaubernd schön
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee518a08fe13d3a18cf5b926b0774146d041e31e57030588773649543311b3a8. 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/DEAD62142404.
Die Zauberflöte / The Magic Flute: Rezitativ und Arie: O zitt´re nicht, mein lieber Sohn … Zum Leiden bin ich auserkoren
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa283968ac1ff07653ef98b0d53d3fcefb106cc755dd07097733c4292e8931ab6. 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/DEAD62142405.
Die Zauberflöte / The Magic Flute: Terzett: Du feines Täubchen, nur herein
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeda618c579b1d2a2a13f969e89ae3c447eb3b1595b68188af6127ac228bce76. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEAD62142407.
Die Zauberflöte / The Magic Flute: Duett: Bei Männern, welche Liebe fühlen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34896ffee5f1aa61ef78bde3c57a7fa3ac0a0ee28a4a8a0659d94b660d6c8a59. 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/DEAD62142408.
Die Zauberflöte / The Magic Flute: Schnelle Füße, rascher Mut
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dcc65734403394ffa5af38e2d383cf2339981c4bebfe46023c8d16c94209d55. 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/DEAD62142413.
Die Zauberflöte / The Magic Flute: Es lebe Sarastro!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30916a6878b13c66ce1ad4aa737fd8e523477e44b836a1d4b128733425b1e372. 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/DEAD62142414.
Die Zauberflöte / The Magic Flute: Marsch der Priester
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bbed6735b1f49aaac19417f2443ea7d5ec90c6db1134f28e0a913ea222baf74. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEAD62142416.
Die Zauberflöte / The Magic Flute: Arie: Alles fühlt der Liebe Freuden
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97d200cacd5efe63f85d9ee25d1216c69897879859960ddc887b031edfa93db1. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEAD62142420.
Die Zauberflöte / The Magic Flute: Arie: In diesen heil´gen Hallen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83479d1feeb5a41e32eaf1642e133f0a3d72f197ece31e86531d26ba550a0b1. 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/DEAD62142422.
Die Zauberflöte / The Magic Flute: Arie: Ach, ich fühl´s, es ist verschwunden
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25089f46a1919708de646a76b8278c4b47ee5b66b0914a6ba9aa87ec4ef1f807. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEAD62142424.
Die Zauberflöte / The Magic Flute: Chor der Priester: O Isis und Osiris
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65c11e240245ebfd0c887ccd170fec29873a3faca0d85a15f1c4ffd4022cafbb. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEAD62142425.
Die Zauberflöte / The Magic Flute: Papagena, Papagena, Papagena! Weibchen! Täubchen!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba6928409dae86d62c6cec732d6437014a039f1216f9e8400bed90d87c6de20. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEAD62142433.
Die Zauberflöte / The Magic Flute: Pa-pa-pa-pa-pa-pa-papagena!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd458bd9c5bc16c629158c1abc913fbce55f39837677dd9ae70b0ea89a0eaab49. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEAD62142434.
Die Zauberflöte / The Magic Flute: Die Weisheitslehre dieser Knaben
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x987eb48202431fe3b73ab6e45aef47ed16f662af9ee83efd062e76ef25ce061f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAD62142410.
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
Die Zauberflöte / The Magic Flute: Wo willst du, kühner Fremdling, hin?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf928924eec7c258b4a47f8b47e60026d98eddf5985bb9177b52c7d46152221b2. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DEAD62142411.
Mozart: Die Entführung aus dem Serail; Turkish March; Opera Arias (Remastered 2024)
Mozart: Le nozze di Figaro, K. 492 (Sung in German) [Remastered 2022] [Live]
Verdi: Aida - Highlights (Sung in German)
Wagner: Die Meistersinger von Nürnberg (Live)
Wagner and Strauss Recital (Hans Knappertsbusch - The Opera Edition: Volume 9)
Singers of the Century: Paul Schöffler (2019 Remaster)
Wagner: Tristan und Isolde, WWV 90 (Bayerische Staatsoper Live)
Wagner: Die Meistersinger von Nürnberg, WWV 96 (Recorded 1953)
Beethoven: Fidelio (Live Recording 1951)
Dokumente einer Sängerkarriere - Paul Schöffler
Lebendige Vergangenheit - Paul Schöffler
Lebendige Vergangenheit - Paul Schöffler (Vol.2)
Richard Strauss: Elektra (New York, Metropolitan, 1952)
Wagner: Die Meistersinger von Nürnberg, Highlights (Mono Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a5f327fce0f10d452536836c9934d468490472c35ae4c948aaacb98d011d74. 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/GBF075540801.
Così fan tutte, K.588 / Act 1: "Sento, oh Dio, che questo piede"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x835e2bae2c6fff22bf9794c5956788c46dddf9e4e2b73c1fb3d326c8061629f8. 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/GBF075540807.
Così fan tutte, K.588 / Act 1: "Soave sia il vento"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b0df4190a5138d6df53106f828d27f8f13083be80c4f279d51fc7501b0e865. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBF075540810.
Mozart: Così fan tutte, K. 588 (Live 1954)
Strauss: Die Liebe der Danae, Op. 83, TrV 278 (Live)
Wagner: Die Meistersinger von Nürnberg (Hans Knappertsbusch - The Opera Edition: Volume 4)
La traviata, Act I: "Libiamo ne'lieti" (Brindisi )
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a167f6f0f308cdbf754fad476adeae07ff3f5c7432cdae5351d5c99a922547. 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/USX760500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49754b202b7aa61de379353fa68b3476d4fd7d1a392eaffc88f167d782cd4b80. 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/DEF050702020.
Voi lo sapete, o mamma (Cavalleria rusticana)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97d29c207e6a2967912d0e5dbc0168d6223c5a39673562c7dabf7925a1c2a0b. 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/GBAYC0802087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ace623c54f65fa9a99d3b7057872c27422332cc06fbb3bec477898f160dbd1b. 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/DEF055702500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab28669e33da0d672899e0a00cbef24aad7102aa5bb2d75e60079fcc854e999. 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/DEF055302850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0185cc342420e252166e0547def5e9a01ac68189fce5b06bb0584dc9b8a77a4f. 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/GBF075540401.
Die Zauberflöte, K. 620, Act II: No. 10, O Isis und Osiris
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe960877baa8526c627d7aadd8eeb420366f9b36c8ae50d0b79b9c34222b81028. 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/GBF075540417.
Die Zauberflöte, K.620 / Act 1: "Hm! hm! hm! hm!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597a01cdc27658bdcda7bf0235dff58da0354843cdb869aa97461db0596af659. 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/GBF075540406.
Die Zauberflöte, K. 620, Act II: No. 14, Der Hölle Rache "Queen of the Night Aria"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32480bd07febdb300aaa4384249ecf654722c3c95eed6fb72897226852c3022e. 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/GBF075540421.
Die Zauberflöte, K. 620, Act II: No. 20, Ein Mädchen oder Weibchen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc0bcc323116915bc7ba25eefed4f5d9327688b17be1436536f22f795af4d30. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBF075540427.
Die Zauberflöte, K. 620, Act I: No. 8, Finale: g. Es lebe Sarastro! Sarastro lebe!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad1e31b70fd57c139d5780bfbcc9e3e4a3d137fd71879d939d4eb66f05d54b8. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBF075540414.
Die Zauberflöte, K.620 / Act 1: "Wo willst du kühner Fremdling hin?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8292c3fca076e1763587ac4e1149d5117b7e040d11aab5524367545220f11494. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075540411.