Johannes Wolfgang Zender (22 November 1936 – 22 October 2019) was a German conductor and composer. He was the chief conductor of several opera houses, and his compositions, many of them vocal music, h
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 0x373a1f9a06b72af20f0380ccbc8ce26db050515becb04d42f260ae8912277b91. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/286e0219-6e9c-4878-aa1a-b64344bb7f98.json and https://artists.proofprofile.net/proofs/artist/286e0219-6e9c-4878-aa1a-b64344bb7f98.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Olivier Messiaen: Les Offrandes Oubliées - Gustav Mahler: Totenfeier
Winterreise, Op. 89, D. 911 (Arr. H. Zender)
Schoenberg: A Survivor from Warsaw - 5 Orchestral Pieces - Begleitungsmusik zu einer Lichtspielszene - Messiaen: Hymne au Saint-Sacrement
Riehm: Gewidmet - Lachenmann: Harmonica - Boulez: Rituel
Hans Zender: Music To Hear, Litanei, Muji no kyo & Furin no kyo
Scelsi: Quattro pezzi per orchestra - Pranam - Zender: 5 Haiku for Flute and Strings - Zeitstrome - Kantate
Hans Zender: Cabaret Voltaire & Mnemosyne "Hölderlin lesen IV"
Zender: 33 Veränderungen über 33 Veränderungen (Eine komponierte Interpretation von Beethovens Diabelli-Variationen)
Zender: Dialog mit Haydn - Issei no kyo - Nanzen no kyo
Schuberts Winterreise: No. 3, Gefrorne Tränen
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 0xf7b33d04dfea70b3f20f412058eec220d018b13888b7911a747726e29889b194. 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/FR50X1642503.
Schuberts Winterreise: No. 5, Der Lindenbaum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a7c3491fcbed354099fe937027d89bb5552a2d90079d98fac936b8ab682b599. 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/FR50X1642505.
Schuberts Winterreise: No. 6, Wasserflut
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c631adc0f1955e0248f55f0901803e689a534f0d6a45ae262976f7bad8bdcaa. 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/FR50X1642506.
Schuberts Winterreise: No. 7, Auf dem Flusse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dbf64ecae495295aa6544eddea921f8fd0a75983f4567eaf7f65d752102bd43. 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/FR50X1642507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397dbe70b1c8d7b0c997ff88ab99c0154688d52d8ac23f21aa7bdb4af7eaf139. 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/FR50X1642508.
Schuberts Winterreise: No. 11, Frühlingstraum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8aa2249a1d0a2d4484ba86c6d740de3cbdd658096cda08912f2c1b3e15a6ea. 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/FR50X1642511.
Schuberts Winterreise: No. 15, Die Krähe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x967667e9771e3a4f63c819cf9c45afff8c14acc78e47a370176d593be0d35b6b. 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/FR50X1642515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5845269fdf3d55c9a9f6dde35698fe95cc2872457ba7d76e38a8dcc34a01a304. 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/FR50X1642517.
Schuberts Winterreise: No. 18, Der Stürmische Morgen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58cc5525577df5b63d5240a08275bdc9defe623ae5e83675233e8700a892aa9. 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/FR50X1642518.
Schuberts Winterreise: No. 20, Der Wegweiser
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520899d1d628af54ae7ed13bd0febb2b02ee74fcd7cd87d61529f4294263aa01. 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/FR50X1642520.
Schuberts Winterreise: No. 21, Das Wirtshaus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f305ca9b532653176444620803051cd761e1f53d3651f6fe91e3732319a14ff. 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/FR50X1642521.
Schuberts Winterreise: No. 23, Die Nebensonnen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff82ce73faeca3f16aa91442fcbd0fb7f6439bc653137cf5727a15c5bc5ad297. 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/FR50X1642523.
Schuberts Winterreise: No. 24, Der Leiermann
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c99b998c1225deae13add545a1f3702e603168be30d4254586b55c85df8c3da. 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/FR50X1642524.