Hartmut Welker (born 27 October 1941) is a German operatic bass-baritone. Career Welker was born in Velbert. Before he decided to study singing, he had learned and practiced the profession as a too
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 0x0247495640cb07f8fddaf3ff5011e79a6b042955a5575947bdf50d47d3e8344c. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c93f21e-cf6c-4c02-a19a-fd8d895ddd5a.json and https://artists.proofprofile.net/proofs/artist/9c93f21e-cf6c-4c02-a19a-fd8d895ddd5a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7be6cc91996abc53099e5eb5280fb0e4c1280590faacec824921553281896b3. 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/DEF059131603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923d7bddde3e9b8a3d4dadcb1f788673c645060284bc4caab72a8bff91ec55ff. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEF059131601.
Lohengrin, WWV 75, Act I Scene 1: Hört, Grafen, Edle, Freie von Brabant!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9fa837cd0509c1d973943a61fc68fbbb3f62476d947e0683b4305527a3b4bff. 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/DEF059131612.
Lohengrin, WWV 75, Act III: Treulich geführt ziehet dahin "Bridal Chorus"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc92d9d1dfc1e3d29019f488cb96819be2af7967809c7d5170b5eba06c72c6756. 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/DEF059131602.
Lohengrin, WWV 75, Act I Scene 1: Dank, König, dir, daß du zu richten kamst!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631ae51372466d65acde01978132dd329aaf041819b3a4dbfc301d5c209a58f8. 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/DEF059131613.
Lohengrin, WWV 75, Act II Scene 2: Elsa! ... Wer ruft?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe70b76ec39d2bf79a2ce0dacfe86cadd8a9c1bc8487cb41b18a5bdbfbc49e508. 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/DEF059131627.
Lohengrin, WWV 75, Act III Scene 2: Das süße Lied verhallt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb894f1be00202fe34d08621478e0e82eddcfbd3ff9e0b3cfb97aafc4844afd4. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059131608.
Lohengrin, WWV 75, Act III Scene 2: Wie hehr erkenn' ich unsrer Liebe Wesen!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x906498beddfcabf6f528dc56b4a128738dda984238aecb7db11d9f6e4553a4f0. 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/DEF059131637.
Lohengrin, WWV 75, Act I Scene 2: Einsam in trüben Tagen "Elsa's Dream"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a76b044bdf01e07ef34be25b4d7c11a6d2a8eb941ae9cf143853e3bc54556ae. 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/DEF059131615.
Lohengrin, WWV 75, Act I Scene 2: Des Ritters will ich wahren
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa848d9d0f526d1a8ab1a0cc4c825f9ddbfbcb693b46c6d7c30a0b2b82f97ec8f. 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/DEF059131616.
Lohengrin, WWV 75, Act I Scene 2: Ohn' Antwort ist der Ruf verhallt!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4da4cf2e023e880e54f6d0de7dd0cbd0ba97ba4c25e99191bfb941026dc1a66c. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEF059131617.
Lohengrin, WWV 75, Act III Scene 3: Morgenröte - Heil König Heinrich!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02eced207537df874f41576473ef4c87b06342a57a3435e9090d708f1f58928c. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059131609.
Lohengrin, WWV 75, Act I Scene 3: Nun sei bedankt, mein lieber Schwan!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73eb4619c373d9e19e4d6a1f94f8e865941d0a042f8fc33af9ff0902a563f118. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059131618.
Lohengrin, WWV 75, Act II Scene 4: Gesegnet soll sie schreiten "Procession to the Cathedral"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655fc45e60b0244b4e2a8c2a5883371f1687969722fcb85e836fcc53e3048291. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DEF059131632.
Lohengrin, WWV 75, Act III Scene 3: Was bringen die? Was tun sie kund?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7200a8fa3b386da928c5266a8cc391c11657fb0e6ddf7412d228c20d2a64ae0. 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/DEF059131640.
Lohengrin, WWV 75, Act I Scene 3: Wenn ich im Kampfe für dich siege
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2efcf71788992448d898bdffdf45a6d00f3465685dcd98ac1926b956d3064a3c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059131619.
Lohengrin, WWV 75, Act III Scene 3: In fernem Land "Grail Narration"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1b3436a707b75ee14441f6f7195d730b6dc9d26ef8bc3c4e551387a434c22b. 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/DEF059131610.
Lohengrin, WWV 75, Act II Scene 5: Welch ein Geheimnis muß der Held bewahren?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3b5fea0a4c8732468dba8d988b63be74ebcb2004fcfc697fcd8aacd97586f27. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/DEF059131635.
Lohengrin, WWV 75, Act I Scene 3: Durch Gottes Sieg ist jetzt dein Leben mein
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8866f6d7efedc325ecd5137386d4280b92cb18401d5e942915ffd0f1b7aed04. 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/DEF059131622.
Lohengrin, WWV 75, Act II Scene 1: Erhebe dich, Genossin meiner Schmach!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87bdb596bec0fab0437a6c2ede7f41bda49cae0f0308601a3d81f5307a997f84. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059131624.
Lohengrin, WWV 75, Act II Scene 1: Was macht dich in so wilder Klage doch vergehn?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfccd49b19f23e4fce13fd61cfb9007f110f0ed6f334adca6dd79dba7904b7269. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/DEF059131625.
Zemlinksy: Der Traumgörge, Op. 11 (Live)
Abbado A-Z: Vivaldi - Wagner + Galas & Recitals
The Four Seasons, Violin Concerto in E Major, Op. 8/1, RV 269 "Spring": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34420b6f12fe74292d8cc425a419f9821b48793479de20a38143e371c25aa274. 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/NLA508640401.
The Four Seasons, Violin Concerto in G Minor, Op. 8/2, RV 315 "Summer": III. Presto
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Gurrelieder, Pt. 1: No. 1, Orchestral Prelude
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67cb3300fbe510f988582fa6a15d993f07340d8595c23f40a7613864dd9f0a2. 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/DEF059232201.
Gurrelieder, Pt. 2: No. 12, Herrgott, weisst du, was du tatest (Waldemar)
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Gurrelieder, Pt. 1: No. 2, Nun dämpft die Dämmerung (Waldemar)
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Gurrelieder, Pt. 1: No. 3, O, wenn des Mondes Strahlen (Tove)
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Gurrelieder, Pt. 1: No. 4, Ross! Mein Ross! (Waldemar)
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Gurrelieder, Pt. 3: No. 16, Mit Toves Stimme flüstert der Wald (Waldemar)
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Gurrelieder, Pt. 1: No. 7, Nun sag ich dir zum ersten Mal (Tove)
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Gurrelieder, Pt. 3: No. 19, Der Hahn erhebt den Kopf (Waldemar's Men)
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Gurrelieder, Pt. 3: No. 20, Orchestral Prelude
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Gurrelieder, Pt. 3: No. 21, Herr Gänsefuss, Frau Gänsekraut (Sprecher)
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Gurrelieder, Pt. 1: No. 10a, Orchestral Interlude
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Fierrabras, D. 796, Act I: No. 1, Introduction. Der runde Silberfaden
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Fierrabras, D. 796, Act I: No. 4b, Bass and Chorus. Des Krieges Los hat Euch
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Fierrabras, D. 796, Act I: No. 3, March and Chorus: Zu hohen Ruhmespforten (Reprise)
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Das Wunder der Heliane / Act 3: Am siebten Tore nun
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Die toten Augen: Wir schnitten die Halme (Live)
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Die toten Augen: Heut ist der Tag (Live)
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Zemlinsky, A. Von: Traumgorge (Der) [Opera]
Wagner: Flying Dutchman; Parsifal etc. (Highlights)
Die Meistersinger von Nürnberg, WWV 96: Prelude
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Lohengrin, WWV 75, Act I Scene 3: Nun sei bedankt, mein lieber Schwan! - Wenn ich im Kampfe für dich siege
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Lohengrin, WWV 75, Act II Scene 2: Euch Lüften, die mein Klagen ... Du ärmste kannst wohl
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060999ccdce6b438685f0b510473008ea21466860cb50043afc1d1bb2037d3fd. 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/DEF059131607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923d7bddde3e9b8a3d4dadcb1f788673c645060284bc4caab72a8bff91ec55ff. 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/DEF059131601.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb894f1be00202fe34d08621478e0e82eddcfbd3ff9e0b3cfb97aafc4844afd4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059131608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02eced207537df874f41576473ef4c87b06342a57a3435e9090d708f1f58928c. 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/DEF059131609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1b3436a707b75ee14441f6f7195d730b6dc9d26ef8bc3c4e551387a434c22b. 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/DEF059131610.
Wagner: In fernem Land - Berühmte romantische Arien