thumb|right|Hans Hotter Hans Hotter (19 January 19096 December 2003) was a German operatic bass-baritone. He stood and his appearance was striking. His voice and diction were equally recognisable.
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 0xa67aa6725e9c2cdfaf3b26487a40fea6631f6473fdba49f0ce615e392956614d. 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/b5c8d692-e6c6-4c62-9d5d-8cfb494e1c81.json and https://artists.proofprofile.net/proofs/artist/b5c8d692-e6c6-4c62-9d5d-8cfb494e1c81.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Richard Strauss: Salome, Op. 54, TrV 215 (Bayerische Staatsoper Live)
Wagner: Der Ring des Nibelungen, WWV 86 (Live)
R. Strauss: Die schweigsame Frau, Op. 80, TrV 265
Schubert: Winterreise D 911 by Hans Hotter & Michael Raucheisen (Remastered 2021)
Schubert: Winterreise, Op. 89, D. 911 (Remastered 2020)
Beethoven: Symphony No. 9 in D Minor, Op. 125 "Choral"
Schubert, Brahms & Strauss: Lieder (Live)
Tristan und Isolde, WWV 90, Act I: Act I: Introduction
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 0x26c5bad7b730bd389b769a4d2017304aa619baf8ac436aa0107f9983da1294ea. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/DEB950360301 — a six-check JSON result.
Parsifal, WWV 111, Act I: Act I Part 1: Prelude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062ec6988113f28095ac6345a85dedfe9fd91d0c869c1c1b9cc27f9c7e62a89f. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEB950769001 — a six-check JSON result.
Wagner: Das Rheingold, WWV 86a (Recorded 1953) [Live]
Der Mond, Act I: "Vor Zeiten gab es ein Land" (Erzähler)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c8f2572e2bb878c17edf010fac839d24939e8366e3146b81e0afb67faf5c468. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF161534801 — a six-check JSON result.
Schumann: 12 Gedichte nach Kerner - Wolf: 3 Gedichte von Michelangelo
Wagner: Die Walküre, WWV 86B (Live Recordings 1958)
Schubert: Schwanengesang, D. 957, Dietrich Fischer-Dieskau vs. Hans Hotter (Compare 2 Versions)
Furtwängler Conducts Brahms, Vol. 2 (Live)
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.
Götterdämmerung / Dritter Aufzug: Immolation Scene
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadcc77baea926504df02b78820494a3ae75ecf4bf995955b5c2f933cca43c677. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/GBF076410262 — a six-check JSON result.
Wagner: Der Ring des Nibelungen, WWV 86 (Remastered 2021) [Live]
Wagner & Schubert: Opera Selections & Lieder
Strauss: Die schweigsame Frau, Op. 80, TrV 265 (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad54d0daf2b767f2be1b240f325659ae6502e4540f072fc70f3231cd9821bfcf. 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/GBAYC9403153 — a six-check JSON result.
Die Walküre, Act II Scene 1: Nun zäume dein Ross, reisige Maid - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c13ac6fa8e6a35c995367582d60abe1d6c3a7cc3a42c26ca77ac1b5190691c. 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/GBF071240114 — a six-check JSON result.
Die Zauberflöte, K. 620 / Erster Aufzug: "Zum Ziele führt dich diese Bahn"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd2f6261685e41ef38bdbabdf8eeae0cdbf21ef5d3845d480e0b649a720793a. 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/DEF056430626 — a six-check JSON result.
Die Walküre, Act II Scene 1: Nichts lerntest du - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd18f502717ffe1ba462874eb8bce79c6bb544c333b14d6a5ce8306714ec634. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF071240117 — a six-check JSON result.
Die Walküre, Act II Scene 1: Was verlangst du? - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe95e97e40fad2df4536892b45c0cb06cf2c912a6e3acf9b1c39e9d01f00cf0e9. 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/GBF071240118 — a six-check JSON result.
Die Walküre, Act II Scene 2: Schlimm, fürcht ich, schloss der Streit - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d44fb4157f7da77374151f060e6a6360b43f02c703fe17478c23f46ff8c040e. 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/GBF071240119 — a six-check JSON result.
Die Walküre, Act I Scene 3: Was keinem in Worten ich künde - 2012 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48925c42b1ea4e99af51276b7291679bba7322c8b1e285ac50e7f9ace20b2cf8. 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/GBF071240120 — a six-check JSON result.
Die Zauberflöte, K. 620: Act I: Arie: Der Vogelfanger bin ich ja (Papageno)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ee81aaa65ba1f62accb6f069d633838c5cf71195227d7dd9927285eaf8c67a. 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/US2TL0945005 — a six-check JSON result.
Die Walküre, WWV 86B / Act II: Nun zäume dein Ross, reisige Maid - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e790492d0db7f82159bd1832efe8e7b999d80afbca20169d853514dc4a58c2. 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/GBBBC2200526 — a six-check JSON result.
Die Walküre, WWV 86B / Act III: Leb wohl, du kühnes, herrliches Kind - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd336ecdd335bac5d8e98fbaf49af25a2ce1c89197c2bc219ce2fde868c1447da. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/GBBBC2200553 — a six-check JSON result.
Die Walküre, WWV 86B / Act III: Denn einer nur freie die Braut - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5caad5daaef11c0748c92228998cc37f76366316a7f1dd7ff7c806744fc8bd70. 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/GBBBC2200554 — a six-check JSON result.
Die Walküre, WWV 86B / Act III: Loge, hör! Lausche hieher! - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7abdd531d162ff6de761bd444ad5a6cb1563efcea9f33cd94e34c92a27f5c70. 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/GBBBC2200555 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb79dd0d3a21ef6c892451608f9ba14cb5a88cf3df73c4c90b5f0b4c9de7effd3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US2TL0945001 — a six-check JSON result.
Die Zauberflöte, K. 620: Act II: Terzett: Seid uns zum zweiten Mal willkommen (Drei Knaben)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319c4a529b6b2fc3158b358a6ba7b1d84933620c037f17ff15e35a871f097595. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/US2TL0945033 — a six-check JSON result.
Die Zauberflöte, K. 620: Act II: Finale: Bald prangt, den Morgen zu verkunden - Der, welcher wandert - Papagena! Papagena! Papagena! - Nur stille! Stille! Stille Stille!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48fbe584a5d3ea8a517534e17e58adc79ffa802fae92a0e69ee887fffacf73b. 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/US2TL0945043 — a six-check JSON result.
Die Walküre, WWV 86B / Act II: Nichts lerntest du - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb06b2b8c43debaa06f4c84fdc0070f298d210b080225968a31e3305b228cc5a. 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/GBBBC2200529 — a six-check JSON result.
Die Walküre, WWV 86B / Act II: Was verlangst du? - Remastered 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60a5c502d1b73e5e35e29c9a904131ff3297d26ec23714be8bf532202eb62ba2. 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/GBBBC2200530 — a six-check JSON result.