thumb|Studer as Rosalinde in Die Fledermaus, Bavarian State Opera, Munich, 1997 Cheryl Studer (born October 24, 1955) is an American dramatic soprano who has sung at many of the world's foremost oper
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 0xc488389ef582bb07a5334a35dac0e6a0da198b4eac98f8e691b482195bb59ce0. 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/97eef636-cc85-4fac-b826-ff143198cf3b.json and https://artists.proofprofile.net/proofs/artist/97eef636-cc85-4fac-b826-ff143198cf3b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x4da8f2ee62dfd71bf7a443f4d5a6d676d006e8e4f0e94e28c1502f1b9bc78025. 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/DEF059131102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf23c3490ecce5fcccb0a7cc149d264f71006e18cb94f4d4665673f0f61f284eb. 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/DEF059104471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8784af97ff1df6d6540ceee3c9c2051079a2d58772a357f2a829d91d580e3c. 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/DEF059104472.
Don Giovanni, K. 527, Act I Scene 1: Notte e giorno faticar (Leporello, Donna Anna, Don Giovanni, Commendatore)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72715be7f8500543268c754da7df8cf9b8045f76e75df5fc619df4c7b5f8272d. 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/GBAYC9004364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf23c3490ecce5fcccb0a7cc149d264f71006e18cb94f4d4665673f0f61f284eb. 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/DEF059104471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe387c0ba79296fb51b46c6240d0b563a13914d9b1949b0f3a6d307fe47bc6cbc. 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/DEF059104474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8784af97ff1df6d6540ceee3c9c2051079a2d58772a357f2a829d91d580e3c. 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/DEF059104472.
Don Giovanni, K. 527, Act I Scene 3: Non ti fidar (Don Giovanni, Don Ottavio, Donna Anna, Donna Elvira)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa7c0fcb5ab9b114b10aa9935240bdde004ae63689bdb8598c056a05714bebf. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9004383.
Don Giovanni, K. 527, Act I Scene 3: Or sai chi l'onore (Donna Anna)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55bd157c881b8ec988709073cbd16aa56d9263594ab732e9eca3c5dd8b3b1a69. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/GBAYC9004386.
Don Giovanni, K. 527, Act I Scene 5: Trema, treme, o scellerato! (Tutti)
Konzertvereinigung der Wiener Staatsopernchor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d822dcc599decdd803d5f569d41b9bf5f9339bef3b856f22183f0c3470ab10f. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GBAYC9004404.
Don Giovanni, K. 527, Act I Scene 3: Mi par ch'oggi il demonio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25664afe4bcd1e52ab8dce930210fae26ebacded5b18e78960cd0b1e9da5971. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBAYC9004382.
Don Giovanni, K. 527, Act I Scene 3: Don Ottavio, son morta! (Donna Anna, Don Ottavio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0451c2c47ca20dbe10b0f3f048d462b9a6070937962b3af0261041f2e5de77a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBAYC9004385.
Don Giovanni, K. 527, Act I Scene 4: Bisogna aver coraggio (Donna Elvira, Don Ottavio, Donna Anna, Leporello, Don Giovanni)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d86df9b08595f99a09ed7cb7f0f51b812dd74151e5208a150c7cbdc8b7755b4. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/GBAYC9004397.
Don Giovanni, K. 527, Act I Scene 4: Protegge il giusto cielo (Donna Anna, Don Ottavio, Donna Elvira)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc33c80cb024769ee2d7918eb61cb80603a5c00fa1756b37aa645a1615e1919. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBAYC9004398.
Don Giovanni, K. 527, Act I Scene 5: Ricominciate il suono! (Don Giovanni, Leporello, Donna Elvira, Donna Anna, Don Ottavio, Masetto, Zerlina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5815e89bb3349f91cf98d8b9ce56a7b717f65a0d865b8f38b6c7fde9b6765ff. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/GBAYC9004402.
Don Giovanni, K. 527, Act I Scene 5: Ecco il birbo (Don Giovanni, Leporello, Don Ottavio, Donna Anna, Donna Elvira)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedbe8dc4575aeaf7f5c097b1f1df24452ee349c1c4db3c1287c97126804872f5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBAYC9004403.
Tannhäuser - Paris version / Act II: Dich, teure Halle, grüß ich wieder
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66be2929a71bab5b217b8a177eb33a101bfdcd0d4e144b0068bc0d1fd6c73c7. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/DEF058831005.
Tannhäuser - Paris version / Act II: "Dort ist sie; nahe dich ihr ungestört!" - "Der Sänger klugen Weisen lauscht' ich sonst"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5413ac33e4a67ecafea75672b482cebdae26dd0b084ad648999a9ab0073718f5. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/DEF058831006.
Tannhäuser - Paris version / Act 2: Gepriesen sei die Stunde (Elisabeth, Tannhäuser)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426c5414f517629a1265424ba39f867c71dc0116c135c6eb5c02181c81b195e2. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/DEF058831044.
Tannhäuser - Paris version / Act 3: "Allmächt'ge Jungfrau, hör mein Flehen!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250d57b06b04d3f2c8f06232e9ab2d96ca6747bd47dafa63f226b8964b95db15. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/DEF058831041.
Die Zauberflöte, K.620 / Act 2: "Der Hölle Rache kocht in meinem Herze"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330ed8b7ad35194bb72d7c44fba100782320e26a3c69c2d30da3a3a7f8da22e6. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/NLA508840229.
Choral Fantasy in C Minor for Piano, Chorus and Orchestra, Op. 80: II. Finale: c. Marcia, assai vivace - Allegro - Live at Schauspielhaus, Berlin, 1991
"Allegro" - Berlin Philharmoniker plays Bach, Beethoven & Mozart
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe79c70bbc65c79de95914647793edefa6714679f017cb6db0c09b8fc4d1fae06. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/DEF059102594.