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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d1ea495e5e3f41896e0d36996fbcdfa9272546d6e48ffaceba6be586f6d0aa. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed21d7546bb38f2f60148271364dbd23113867580c6226fbecdc0741dbd088fc. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/FR50X2066401.
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 0xb0b5f4e43840ff0520e29e6d2d2f5e6b0ef5ad8d13796a60db99780b2b226632. 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/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": 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 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.
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.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e8a5fb3a0d160650b7a290dbdb2af9bf257159a653218852e5cbdaaf72d340. 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/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.
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 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/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 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/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 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/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 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/FR50X2066416.