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
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, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB338632501.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB338632503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5329d78851616f1a71a979324ac06f80bac12437558ae601a07c539283b20739. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DEB338632504.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB338632505.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB338632506.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB338632508.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB331545401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e6f49246e1ce7d8e3af3bc160e98a32af5eb8252651c028d444e3400c4fcd85. 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/DEB331545403.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB331545405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bff339d5045bffa5aa2489c960c13b6efd634f6df3426757baa7269e3d06aa4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB331545406.
Cantus in memoriam Benjamin Britten - Remastered 2015
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5257855ba1ce655743a725ba425520dc9ee7b6824c0675718a188bfdffab03. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB331545503.
Chamber Music (Finnish): Century of Finnish Chamber Music (A)
Mon coffret naissance (Comptines, berceuses, musique classique, imagier sonore & musical & boite à musique)
GAIA Music Festival 2018: Music by Deane, de Falla, Fortmann & Mozart (Live)
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190190402.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190190405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37995add3e1bb3eb6d6099843c78264e9438f5284dbddbe5d376ba67f731e11b. 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/HKI190190407.
Chugoku-chiho no komoriuta: Chuugokuchiho No Komoriuta (Lullaby from the Chugoku District)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64a7fee3c0a7103e2f3774fa7b71b3a7d705fc39622e3974a9fc83f4a8db48fe. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190190411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa339e686c52be7d60d18982bb91c5292a06b55bd03676201b31dae75a164d1. 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/HKI190190412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc287ed6871381ca8a5d6128891ddc703aea1988cd83b15e5d8158a85901c5d62. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190190417.
Kaya no kiyama no (On the Hill of the Kaya Trees): Kayanokiyamano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa28cb4ef03253a433c4ae090269e52fd66ce94e27669e162d09b3d5bcf865b02. 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/HKI190190419.
Paganini: Complete Quartets for String Trio and Guitar Vol. 1
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae500347b4f1339c6c369c5b9dc9133a301cab859dd503ca4f9c398226ceedf8. 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/NLA509012254.
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5103b7088f4728bd9ba0ed07b515b214b64cba9d9c5e48267b4979cb02ea35ff. 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/CH8292000888.
String Quintet No. 1 in F Major, Op. 88: III. Allegro energico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f859d7b18c92038dec7069b4f849ec5e771747e26bf408ddeb76ee1d0b3da08. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH8292000890.
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
String Quintet No. 2 in G Major, Op. 111: III. Un poco allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea780ace89527877fc6c24ca4c1dde7165d11c81b635b19e2c9967f3772fff5. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/CH8292000893.
String Quintet No. 2 in G Major, Op. 111: IV. Vivace ma non troppo presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34fe8b01cb4239f0a141b61b589fa0738feabcf9975a7a39684aec9ee71c9615. 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/CH8292000894.
Wolfgang Amadeus Mozart: Kegelstatt Trio & Clarinet Quintet
Shostakovich: Sonata for Violin and Chamber Orchestra
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