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 0xd498c356a0d6db06cd9976ae7ceb9ec0833efbeee191d7bec72fce92be91e4ae. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/148efa8a-eca8-4f0c-a724-69911025992e.json and https://artists.proofprofile.net/proofs/artist/148efa8a-eca8-4f0c-a724-69911025992e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Heimat - 500 Jahre Heimatlieder und -gedichte
Buchenwaldlied (Arr. for Tenor & Horn Quartet by Alexander Krampe)
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 0x235d3e7a6f48ee829e7f007911cf169a38be56521ae3350702f57941d2d9593e. 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/CHE272201127.
Mozart: Twelve Duets For Two Horns K487 (K496A)
12 Duets For Two Horns, K. 487: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e8aa6cc97d4a1b34ed2fb07cde2a15ddd3b422cf611b0c0e96564b7854ac5fa. 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/DE1E12210001.
12 Duets For Two Horns, K. 487: II. Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25ed1429b96bdf5ed9c1ca5f0d640625bb76f60d033f7522d5c2476aa9f2241f. 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/DE1E12210002.
12 Duets For Two Horns, K. 487: III. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93657e5d22f83e46895bc3809a344d519c828f451c8c8c519c955414e0338ac4. 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/DE1E12210003.
12 Duets For Two Horns, K. 487: XI. Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe792b9c40ee1c90123de4fa76685de230072b10a9913bd009b284c0f7c1b15ad. 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/DE1E12210011.
12 Duets For Two Horns, K. 487: IV. Polonaise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x412e437ea3d83470b17ca61c760fde2c7000bcf5c12ca248c6b4243751c16026. 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/DE1E12210004.
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
12 Duets For Two Horns, K. 487: V. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2ddd06d261a93549f0803529a4bd185d0008683d01360f7a69a1ae57753cd5. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DE1E12210005.
12 Duets For Two Horns, K. 487: VI. Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc696755337927cecce3a9de8ad351963f863838437135a6916b522130b1dd8. 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/DE1E12210006.
12 Duets For Two Horns, K. 487: VII. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08166cf72f4a3cafb6d6ea29242562e8cae89dc235aa47a2204ab74d2063d590. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/DE1E12210007.
12 Duets For Two Horns, K. 487: VIII. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ceb5c8e1ccf5ae34d3258a49d2ce3fb265a8e6b1fe41c4cc1826946836ad95. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/DE1E12210008.
12 Duets For Two Horns, K. 487: IX. Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a35c535596b7c97a0f0590f09e44f34d133d08060c18fc4b0ae393a12a910f. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DE1E12210009.
12 Duets For Two Horns, K. 487: X. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe40eecbc53b11ff3baa0c918e0c028735212cecb43ce1d93f83e37b7d018a34b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DE1E12210010.
12 Duets For Two Horns, K. 487: XII. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fef2bce7d2f5064daea766c76b9a45f515781e928704ff283c1e9c8dfc0405a. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DE1E12210012.
Water Music, Suite No. 1 in F Major, HWV 348: III. Allegro (Arr. C. Eß for Horn Quartet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06c83b520ff06c57ccc892493fbb40bfd942cc1d26d68006d205557b06c303d. 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/DET901849301.
Rinaldo, HWV 7: Lascia ch'io pianga (Arr. S. Schottstädt for Horn Quartet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6adf9779316d67d6a1bee5a2da2c151b6031caaf6cc5cfa6fd7edbc2cc3921bf. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DET901849302.
Stabat Mater, P. 77: No. 1, Stabat Mater dolorosa (Arr. S. Schottstädt for Horn Quartet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f722153ce99ee6aae0252f393bdd7984378e3a5bf3f0deaf853c8609534c3d. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/DET901849303.
Symphony No. 9 in E Minor, Op. 95, B. 178 "From the New World": II. Largo (Arr. S. Schottstädt for Horn Quartet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4741db060a2c7a9475b5186d33fb8b1478eb9a8142f41adb7fcdacb7ca2af6. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DET901849304.
Andante in D-Flat Major (Arr. M. Höltzel for Horn Quartet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c84460caefc577b8c224c070209cf468c07987f1bcdfd54f277acca7c31d22. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DET901849305.
A Midsummer Night's Dream, Op. 61, MWV M13: No. 7, Notturno (Arr. C. Eß for Horn Quartet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de8b1d66c5b66d2e98924b3fd17134365747946aed28076e7e7f3322106a554. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DET901849309.
Hänsel und Gretel: Abendsegen (Arr. S. Schottstädt for Horn Quartet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71636de6b4e771cd29b3edfc3cbd0e0cae879524a91931de1bc49c479fc2f40d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DET901849317.
Der Freischütz, Op. 77, J. 277: Chor der Landsleute (Arr. S. Schottstädt for Horn Quartet)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75aa3eaa94d63b554245362bad8805dcb3818ae05278b9981b423c953bf7b88. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DET901849318.
Schumann, Madsen & L. Mozart: Works for 4 Horns & Orchestra
Sinfonia da caccia in G Major "Jagdsinfonie": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264eefb8d65d2a13ed3c1954778f0ad8477abe6b0efa7524951ed8ce25963886. 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/DET901537001.
Concertpiece in F Major for 4 Horns & Orchestra, Op. 86: I. Lebhaft
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2aadb577daa60da906a064affe40edb1f301e745e173618cef4aae30f1d6f6. 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/DET901537004.
Concertpiece in F Major for 4 Horns & Orchestra, Op. 86: II. Romanze: Ziemlich langsam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4cfbcc1e8230f61ba5d43a350625c41e22c00abe5d9acc2a55265a371128445. 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/DET901537005.
Concertpiece in F Major for 4 Horns & Orchestra, Op. 86: III. Sehr Lebhaft
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Pictures: Music for 8 Horns & Percussion
Siegfried und Violetta oder List, Last, Lust und Lunge
6 Lieder, Op. 86: IV. Über die Heide (Arr. for Tenor & Horn Quartet by Alexander Krampe)
Mahler: Des Knaben Wunderhorn (Arr. for Tenor & Horn Quartet by Alexander Krampe): V. Das irdische Leben
Schubert: Meeres Stille, D. 216 (Arr. for Tenor & Horn Quartet by Alexander Krampe)
Dvorak: Heimatlied (Arr. for Tenor & Horn Quartet by Alexander Krampe)
Kommt ein Vogel geflogen (Arr. for Tenor & Horn Quartet by Alexander Krampe)
Heinrich Isaac: Innsbruck, ich muss dich lassen (Arr. for Tenor & Horn Quartet by Alexander Krampe)
PROSPERO Catalogue 2024 - Our Listening Tips II: Various Composers