Vladimir Mendelssohn (29 November 1949 – 13 August 2021) was a Romanian composer, violist, and professor. He had served as Director of the Kuhmo Chamber Music Festival since August 2005. Biography Me
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 0x287c2d695ec42f10b132d74959764e8660774d683772f582738b0f8115c748a5. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7380e19-17ff-4c42-9612-10269674ae0c.json and https://artists.proofprofile.net/proofs/artist/a7380e19-17ff-4c42-9612-10269674ae0c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Schumann: Märchenerzählungen, Op. 132 - Bruch: 8 Stücke, Op. 83
The Brass Ensemble Staatsorchester Stuttgart
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 0xdfdbfeb105ad3ad730f10d63ff4c3d5b07ec9142ad5fb2b44f36ff864b8a0e7c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB338632501 — a six-check JSON result.
An den Wassern zu Babel saßen wir und weinten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c13eed402bc30649c4c3f5a610d92a37d77e09473c0d23d4b33659fbf208677. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DEB338632502 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x051694779ab6f506bbff87e30887c5c587694b5f580435bad1fb01b96945f37d. 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/DEB338632503 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5329d78851616f1a71a979324ac06f80bac12437558ae601a07c539283b20739. 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/DEB338632504 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc911ebedcf21d0516e143911013f93f81a4df42fa8b5ca0dee56e10572d49b40. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB338632505 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6125e022209aa5955f260909a857443adc32724326dfc06f0210b20f08111386. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB338632506 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d55020c052d0de04ed8b49a05ddf22bb8b1d9c9b744fbee8b0f46b4c7893dea. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/DEB338632507 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e5f1bd355dedb53fba2b57242bccdaa428f03dd909e3ecdafb662130c71cd8. 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/DEB338632508 — a six-check JSON result.
Arvo Pärt: Musica Selecta - A Sequence by Manfred Eicher (Remastered 2015)
Es sang vor langen Jahren - Remastered 2015
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9036f303050c45cb22633ba089d555c6c0a0fcabdc5a0c3fe968811d96c41c71. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB331545401 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d0a4c2b3cc2c289d756725edd0c47d3a47c67d689b07ad8e9579278b89da914. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DEB331545402 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e6f49246e1ce7d8e3af3bc160e98a32af5eb8252651c028d444e3400c4fcd85. 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/DEB331545403 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2318cbc1e88bb53f5cf7f842265d091a10a8bcc62d95fca5b212acb16a8abd48. 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/DEB331545405 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bff339d5045bffa5aa2489c960c13b6efd634f6df3426757baa7269e3d06aa4. 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/DEB331545406 — a six-check JSON result.
Cantus in memoriam Benjamin Britten - Remastered 2015
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5257855ba1ce655743a725ba425520dc9ee7b6824c0675718a188bfdffab03. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB331545503 — a six-check JSON result.
Da pacem Domine (Version with Orchestra) - Remastered 2015
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Chamber Music (Finnish): Century of Finnish Chamber Music (A)
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Mon coffret naissance (Comptines, berceuses, musique classique, imagier sonore & musical & boite à musique)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x537a35bfca8cea71868599bda269ba4cee33c623b0b4f39b216a2f00408d39e5. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRW790800010 — a six-check JSON result.
GAIA Music Festival 2018: Music by Deane, de Falla, Fortmann & Mozart (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4662ccf497e922fe232964bc290f7c0f3725dac273589abaaab274bdf61f7d1. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/HKI190190401 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee95cb6144f5ac1c056a8a7fb7412b1544ecc377eaea5981b8662306e6ebadcb. 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/HKI190190402 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf22ea51c0f94e0d93abcef52bba32d50b9c0a1e5d0be0acace09c8187dd06d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190190403 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b05414f5507eda269447e2eae54f637677fe7c6cfab3caea78d351129f23b0. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/HKI190190404 — a six-check JSON result.
Kojo no tsuki (Moon at a desolate castle) [version for flute]: Koojo No Tsuki
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04afd875fb53ed56271d52a4aad21942df6ff96a6b64ec9c2a6834a71c045c80. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190190405 — a six-check JSON result.
Kono Michi (Arr. Hajime Fukagawa for viola and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed264cffbdc36ae0913b6afe2c6edbc811c0ba1ac4b27e05f15583894043752. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190190406 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37995add3e1bb3eb6d6099843c78264e9438f5284dbddbe5d376ba67f731e11b. 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/HKI190190407 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf034bd025f95266563cfd22d43e2e9b12517f6f10c6fc745a4f905c8bb7be212. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190190409 — a six-check JSON result.
Chugoku-chiho no komoriuta: Chuugokuchiho No Komoriuta (Lullaby from the Chugoku District)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa339e686c52be7d60d18982bb91c5292a06b55bd03676201b31dae75a164d1. 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/HKI190190412 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8c7916c81df33bbcfefa405ed99a37199236eb9c71bfdfe0b5b76d000d3e4f. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190190416 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc287ed6871381ca8a5d6128891ddc703aea1988cd83b15e5d8158a85901c5d62. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190190417 — a six-check JSON result.
Kaya no kiyama no (On the Hill of the Kaya Trees): Kayanokiyamano
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Paganini: Complete Quartets for String Trio and Guitar Vol. 1
Quartet No. 4, (Op. 5 No. 1) M.S.31: I. Presto
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Gubaidulina: Seven Words; String Trio; Garten von Freuden und Traurigkeiten (Lockenhaus Collection Vol. 10)
Seven Words for Cello, Bayan and Strings
Kammerorchester der jungen deutschen Philharmonie
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Mozart: Clarinet Quintet; String Quintet No. 4; Eine kleine Nachtmusik (Lockenhaus Collection Vol. 2)
Merikanto, A.: Concerto for Violin, Clarinet, Horn and String Sextet / Nonet / Works for Male Chorus
Richard Strauss: Vier letze Lieder, Don Quixote
String Quintet No. 1 in F Major, Op. 88: I. Allegro non troppo ma con brio
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String Quintet No. 1 in F Major, Op. 88: III. Allegro energico
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String Quintet No. 2 in G Major, Op. 111: III. Un poco allegretto
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String Quintet No. 2 in G Major, Op. 111: IV. Vivace ma non troppo presto
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Wolfgang Amadeus Mozart: Kegelstatt Trio & Clarinet Quintet
Trio in E-Flat Major, K. 498 "Kegelstatt": I. Andante
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Trio in E-Flat Major, K. 498 "Kegelstatt": III. Allegretto
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Shostakovich: Sonata for Violin and Chamber Orchestra
String Quintet in F Major, WAB 112: I. Gemässigt. Moderato
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String Quintet in F Major, WAB 112: III. Adagio
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String Quintet in F Major, WAB 112: IV. Finale. Lebhaft bewegt
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Beethoven Interpreted by Beethoven (Grand Trio Op. 38, Piano Quartet Op. 16)
Franz Schubert, Piano Quintet In A 'The Trout', D. 667
Shostakovich, D.: Piano Trio No. 2 / Piano Quintet, Op. 57