The Knabenchor Hannover (Hannover Boys' Choir) is a boys choir founded in 1950 by Heinz Hennig, who served as conductor until the end of 2001. Since 2002, the conductor has been Jörg Breiding. Histo
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 0xff5f1cd4da3aec733ae6924af4eca14a435b2550fc2ae49720f579ab33a49423. 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/87f92ec3-526a-4c11-a524-fb8ff0ba2c9f.json and https://artists.proofprofile.net/proofs/artist/87f92ec3-526a-4c11-a524-fb8ff0ba2c9f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Claudio Monteverdi: Vespro della Beata Vergine (Marienvesper)
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 0x574e68b47f5a09db482f8b4250239d761e52e71b84ec2e68a8eaeee31ad3634c. 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/DEN421113001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8daed03c72f49b6e52b2b1801b2612406546da966e30925199550539598107ae. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEN421113003.
Sacred Vocal Music from Wolfenbüttel (Verklingend und ewig)
Il secondo Libro de Madrigali a quattro voci (Das zweite Madrigalbuch): No. 5 o notte, o ciel', o mar', o piaggie, o monti!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9effe221932c9361fc92603a9bc6a0d3276ed110ff47d1cda09ac9b3b27a98. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DEN421111005.
Andreas Hammerschmidt: Verleih uns Frieden (Geistliche Vokalmusik)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1080e31841d5faa48ba98ece59ceb40d6392c97b83cfa04b35c2d852fc2956fa. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN420502001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77ddb6ac3c085d33dd037a169ed5f1fe6ea54744a0b296b653b0ec06fd980df. 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/DEN420502006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93b20dbdd8afc4ebbb42d55894386f6da685f51ec8e57cee80b12e7376aafd5. 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/DEN420502007.
Glaubenslieder: Neue Kantaten zum Kirchenjahr
Knabenchor Hannover: Michaelisvesper mit Werken von Michael Praetorius
Musae Sioniae V: Komm, heiliger Geist, Herre Gott
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c789f0331779a3c8b36b64ff14672135345a1924bec5a3aad5421695c380ef. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEN420902002.
Volkslieder für Knabenchor und Blechbläserquintett (Liederprojekt)
Johann Sebastian Bach: Markus-Passion BWV 247
Markus-Passion BWV 247: Chor: Geh, Jesu, geh zu deiner Pein!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9569c79d7a62bb74df029083f813e2c8be27639e54785a7ba5f6171f3b63b1da. 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/DEN421402001.
Markus-Passion BWV 247: Rezitativ: Und nach zween Tagen war Ostern - Chor: Ja nicht auf das Fest - Rezitativ: Und da er in Bethanien war - ...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ca59441752dff78be254167fc4c908d70b8ffc928fda0537648aedf84bec19. 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/DEN421402002.
Markus-Passion BWV 247: Choral: Jesu, ohne Missetat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc992a0955f5e7a2431b3c635336ab8b2d74d9144c757fe70c6eb89124a2155e9. 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/DEN421402021.
Siegfried Strohbach: Weihnachten mit dem Knabenchor Hannover (Gloria in Excelsis Deo)
Knabenchor Hannover: Portrait (Works by Claudio Monteverdi, Heinrich Schütz, Dietrich Buxtehude, Johann Sebastian Bach, Felix Mendelssohn Bartholdy, John Rutter)
Motetten, Op. 78 No. 1-3: Richte mich Gott
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2680065485fd4e86617f12274930ac7d35d672f8409e7d0484f86574da6986c. 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/DEN421209004.
Dietrich Buxtehude: Membra Jesu Nostri (BUXWV 75)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2347d86cb9e7142646dcf99e2fdde889344012006f5c2fabc18968ef9665cace. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DEN422319019.
Christmas around the World: Stille Nacht, heilige Nacht
Johann Rosenmüller: Marienvesper - Lauda Ierusalem
Buxtehude: Membra Jesu nostri, BuxWV 75: II. Ad genua. "Ad ubera portabimini"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a8580ace0395d57cc29d5cf6dd5955f313774379640240d504eb05f6e18384. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ208704402.