Ksenija Sidorova (born on 18 May 1988 in Riga) is a Latvian accordionist. In 2016, she signed an exclusive recording contract with Deutsche Grammophon. Her first album on the label, Carmen, is a recr
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 0x90d1ea495e5e3f41896e0d36996fbcdfa9272546d6e48ffaceba6be586f6d0aa. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/339627bf-43d9-4892-9f8f-a4df19b5a7f9.json and https://artists.proofprofile.net/proofs/artist/339627bf-43d9-4892-9f8f-a4df19b5a7f9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Chau Paris (Arr. for Accordion, Piano & Double Bass)
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 0xed21d7546bb38f2f60148271364dbd23113867580c6226fbecdc0741dbd088fc. 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/FR50X2066401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed21d7546bb38f2f60148271364dbd23113867580c6226fbecdc0741dbd088fc. 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/FR50X2066401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4489c0ef77e676f509f28c75d9d233abbb8e125e17ee3fcfe496ce8cb68300db. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/FR50X2066402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b5f4e43840ff0520e29e6d2d2f5e6b0ef5ad8d13796a60db99780b2b226632. 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/FR50X2066403.
Nocturne: A Kind of Lullaby of Times We Have Not Yet Lived
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa5c70e229c5fc9b8e079dee63133fc1fed13f43c6f98378e2ce71a291b8bdc5. 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/FR50X2066404.
Concerto for Bandoneon and Chamber Orchestra "Aconcagua": I. Allegro marcato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e5e04456d92e914cefe77352364fd67414d9f0b6987551340f74846a8e060d. 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/FR50X2066405.
Concerto for Bandoneon and Chamber Orchestra "Aconcagua": II. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57ec4385dc4bedccde6f36618f3aaae50d45b2d8f78cf127bd236acd04994d8. 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/FR50X2066406.
Concerto for Bandoneon and Chamber Orchestra "Aconcagua": III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x483e29e03d22c32c3c52e80e0d9a5111e724a7a98bb31dd7ed29579b28c1b148. 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/FR50X2066407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf47337ef189f94d2d6cd8c2ed4780bd25ee04079154d4ad2e0ad6ff6e5290085. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/FR50X2066408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf454eed0810a2f7cc52267a8d66620c3d8c3016b2b1dd6cab3e4de2279395553. 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/FR50X2066409.
Fantasie on a theme of Piazzolla – Chiquilín de Bachín
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d880f515526558a57b63b6f2c45a4f3005bc6e5178a360022bcf6d2b2b1536. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/FR50X2066410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dd20e8a33b64ad787294a4ed53ff702bb7dda77adffdbafb98eb9b8aeac1ba4. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/FR50X2066411.
Adagio in D Minor, BWV 974 (after Alessandro Marcello's Concerto for Oboe and Strings)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb5d42fdd6a82e47ac882a9a257b5cc1fb197029548eb88f03a07788582d374. 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/FR50X2066412.
Two Keys to One Poem by J. Brodsky: The Moon
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf003cde288b8dfcc3ccb82d8caff0dec99993ac7a0a79365fcdf989bc5f99c. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/FR50X2066413.
Two Keys to One Poem by J. Brodsky: The River
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6cd547007efffc8610b9b7280778accee4b04e5688a6ee8e3cfccf08c8e991. 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/FR50X2066414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e8a5fb3a0d160650b7a290dbdb2af9bf257159a653218852e5cbdaaf72d340. 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/FR50X2066415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f1c8b52d7dcdd19715cd89537ce329d68d0648891a59c211f8eedb2a6ec13f. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/FR50X2309004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aaeec70ba6c1132ce9bb129e95af7b4434685179032cce385f57987cab7218f. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GBF071300550.
Concerto in D Minor, BWV 1052 (Transcr. for Accordion and Orchestra by Ksenija Sidorova): I. Allegro
Bach: Concerto in D Minor, BWV 1052: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d35524ce3ab3ac36ccc521e1c285ea4a6c4a1a21ee7bd30ed375b5b9cd96233. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FR50X2309001.
Juan Diego Flórez - The Ultimate Collection
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c5a17ea539362dbeb9779543c1f0b6a54d673269ce7e026a00d7a9a50e6a76. 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/GBF071502200.
Studioorchester der Europäischen FilmPhilharmonie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f884216d5a6f2c9cb3fcdbf35d742ed40bdc36051d52bd7d087a76d2903f644. 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/DEN961300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c5a17ea539362dbeb9779543c1f0b6a54d673269ce7e026a00d7a9a50e6a76. 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/GBF071502200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689b2771e0bf10639c26d9ec4ca438ea942d98789c0f93dc5f4186065c5c66f1. 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/GBF071502210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227c27e500c67fd32beb17b7b3198d6aaaa5cccf084495c0630d73fc98a7f849. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GBF071502240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17708489a8014695e9caeaa7237fd2eb2d3f485f35f8474ae6cce2fc68e298a2. 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/GBF071502260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d03c4344519050266a74470cc168c16a55c9ea8ec06e432ac8729431cbe38b. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GBF071502300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a9b24079578f806e9c7fdf5a3ce02d737390b65b104d495e6d17a090f9b69f. 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/GBF071502330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93200684d1cec06f2fe97655e015fe9aebce66ff7c00e9fb621b0848b8fcd43e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBF071201960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4fab8819a6a7225d60c7996529d785ea03930835aa42d8affeaedc86cd5654. 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/FR50X2066416.