Kirsten Malfrid Flagstad (12 July 1895 – 7 December 1962) was a Norwegian opera singer, who was the outstanding Wagnerian soprano of her era. Her triumphant debut in New York on 2 February 1935 is one
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 0x03a624b0b74653c98f1eddf1490fc974efd15224792fcf7b14b4e0451077be5d. 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/83786c45-bec5-4586-b7eb-8908dd1cfbd9.json and https://artists.proofprofile.net/proofs/artist/83786c45-bec5-4586-b7eb-8908dd1cfbd9.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Anton Bruckner: Symphony No. 3 "Wagner" - Richard Wagner: Parsifal (Kundry's Aria), Tristan und Isolde (Prelude & Liebestod)
Beethoven: Fidelio (Live Recording 1951)
Parsifal Lauritz Melchior's only surving recording live
Peer Gynt, Op. 23, Act IV: Anitra's Dance
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 0xa684ffea87691cd6ebd1587829527e720ab7abf3ef88db49eebf57528ae217ca. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF075740204 — a six-check JSON result.
Kirsten Flagstad Edition - The Decca Recitals
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b657ced9cdc03d1e0b66bdc53535c89f7fb35e78afeb8d61db16dd642d5870. 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/GBF075610001 — a six-check JSON result.
Lohengrin, WWV 75 / Act 2: "Euch Lüften, die mein Klagen"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6cdc102368f6720e28755e68e178ab61f4154eb81b9d9742ffae5d9a48ac18c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056705070 — a six-check JSON result.
Tristan und Isolde, WWV 90 / Act III: Mild und leise wie er lächelt - Live at Bayreuther Festspiele / 1966
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a7e736321b6dc18c1d54bd1eb7e6a4c686768b960d9b504bd293358a695d364. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056630206 — a six-check JSON result.
Wagner: Der Fliegede Holländer, Die Meistersinger Von Nürnberg, Die Walküre, Parsifal, Wesendock Lieder
Wagner: Tristan und Isolde, WWV 90 (Remastered 2021)
Tristan und Isolde, WWV 90: Vorspiel (Remastered 2021)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf02ae8b85cb5f88a1d8a690dc7cb909aebcc1f7ba1ba8ade69d1e7eb100fa0. 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/USB8U2009785 — a six-check JSON result.
J.S. Bach, Handel (Adrian Boult – The Decca Legacy II, Vol. 7)
Grieg: Concerto pour piano, 10 Mélodies & 3 Pièces pour piano (Les indispensables de Diapason)
Wagner: Immolation Scene and Funeral March from Götterdämmerung, Preludes from Lohengrin & Die Meistersinger
Wagner: Die Walküre & Götterdämmerung (Excerpts, Live)
Mahler & Wagner: Orchestral Works (Live)
Henry Purcell: Dido and Aeneas, Z. 626 (Live)
Heroes and Heroines of Bayreuth: Kirsten Flagstad (Recordings 1940-1949)
Grieg: Haugtussa, Op. 67; Two Elegiac Melodies, Op. 34
Das Rheingold, Scene 2: Wotan! Gemahl! Erwache! – Nur die Wonne schafft dir - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8080103c8b5e5140c4719dcce073d35cbc040b06fd10a087e75538976551074e. 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/GBF071240007 — a six-check JSON result.
Das Rheingold, Scene 2: Zu mir, Freia! - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a82638a7c1b29710129b4d6e4f2470c040f46d32a23e184fca6a8917089d9e. 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/GBF071240009 — a six-check JSON result.
Das Rheingold, Scene 2: Endlich, Loge! - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1b54675503df0919c0ed38d280347d6ea3cad7eabe94b419735efbd5559ca7. 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/GBF071240010 — a six-check JSON result.
Das Rheingold, Scene 2: Immer ist Undank Loges Lohn! - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x790ba45f4bc50d813029b6e3c5bf7a5ce1d0bb23e16d324eda127eaef807ce68. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF071240011 — a six-check JSON result.
Das Rheingold, Scene 2: Ein Runenzauber zwingt das Gold zum Reif - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ea35484dea499b4faf09bfa670e9719422bb3f4b623d3cc5a07b40632a193c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF071240012 — a six-check JSON result.
Das Rheingold, Scene 2/3: Auf, Loge, hinab mit mir! – Hehe! Hehe! - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91edc600e8f0ed56fb52586965e3ecc39db228ff5862f5019ae197d53036a4af. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF071240015 — a six-check JSON result.
Das Rheingold, Scene 2: Was sinnt nun Wotan so wild? - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b9b3b3186e9be17c41784937120c45fc63b919b574b2746b2f02455e635689. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF071240014 — a six-check JSON result.
Das Rheingold, Scene 4: Abendlich strahlt der Sonne Auge - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5448ea319bd6166090b40bd251929ec678310633ab5d76972e0db628ad97aa. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF071240029 — a six-check JSON result.
Das Rheingold, WWV 86A / Scene II: Endlich, Loge! - 2022 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8f2af6f49e3bb759ef45ebf234de62ad416c6e74297657a74fb4fbb7455d16. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBC2200256 — a six-check JSON result.
Das Rheingold, WWV 86A / Scene II: Auf, Loge, hinab zu mir!... Hehe! Hehe! - 2022 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda49e98e6d9e39ea3585b87fb94c4946fef466b014a82cfbf54dec3a38e311cd. 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/GBBBC2200261 — a six-check JSON result.
Das Rheingold, Scene 4: Fasolt und Fafner nahen von fern - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908a93400ed7df0a9b26f1af2b018d9583c9f4a2c8fd8210098cab1a8d24af73. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF071240024 — a six-check JSON result.
Das Rheingold, Scene 4: Gepflanzt sind die Pfähle nach Pfandes Maß - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6ced9e047f7def9acbe10aef175212e816b274dbc4bedbb30c1a61e38fd761. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GBF071240025 — a six-check JSON result.
Das Rheingold, Scene 4: Weiche, Wotan, weiche! - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6688e09d685f4fc130e3bc913723d99ce126cf38f1b64499ae93f2c74f92939. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF071240026 — a six-check JSON result.
Das Rheingold, Scene 4: Hört, ihr Riesen! - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x999d3f1731b17468e49c2ac679df849ced4ab822b6e6b5ad898c47b16ac915f0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF071240027 — a six-check JSON result.
Das Rheingold, WWV 86A / Scene II: Wotan! Gemahl! Erwache! - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0cfd1816794a4afd98ca70ceb6cd824c99eab8b859ba520d130775b95c5b1bb. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBC2200253 — a six-check JSON result.
Das Rheingold, WWV 86A / Scene II: Zu mir, Freia! - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7091080ab0f22d90e002e1c637046ad478be47a96ca9194333d5c3be11dcdb39. 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/GBBBC2200255 — a six-check JSON result.
Das Rheingold, WWV 86A / Scene II: Immer ist Undank Loges Lohn! - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20dd28feca08bf66838b49785453cd47b98a420f9c417f9d72bd33fe0bb257df. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBC2200257 — a six-check JSON result.
Das Rheingold, WWV 86A / Scene II: Ein Runenzauber zwingt das Gold zum Reif - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b48af588ad66ca7c140631a26c43499538a7423d0f82c1d0502d59542da071f. 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/GBBBC2200258 — a six-check JSON result.
Das Rheingold, WWV 86A / Scene II: Was sinnt nun Wotan so wild? - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634a17f13716c87aac87b02a499e219e8c6552a97c9d5d10a3fe999ffc51edaa. 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/GBBBC2200260 — a six-check JSON result.
Das Rheingold, WWV 86A / Scene IV: Abendlich strahlt der Sonne Auge - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d4bceb7659dfba497cd9ff5211f6e04c5588f8f3924cda65d251b8e0784fa8. 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/GBBBC2200275 — a six-check JSON result.