thumb|right|Samuel Dushkin, date unknown Samuel Dushkin (December 13, 1891 – June 24, 1976) was an American violinist, composer, and pedagogue of Polish birth and Jewish origin. Dushkin was born in S
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 0xed626277e6a360f7f2e05faa084d28d4108f3b210b3ff6ef9ed1175026f809db. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cd9a3f3c-5362-41cc-8310-d703f8b70d50.json and https://artists.proofprofile.net/proofs/artist/cd9a3f3c-5362-41cc-8310-d703f8b70d50.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Dushkin: Sicilienne (Prev. Attrib. Paradis) [Arr. Pochin & Morgan for Violin, Guitar, Accordion & Cello]
Sicilienne (Fomerly Attrib. Paradis) - Live
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 0x5c90598ede26d883de7ea984d0f05f4d6c2fe2bdca8273ebe93a531d099fe11b. 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/DEN962400087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8891512a0ddd53c3b680a8201133d4f2d6cda6d99aa43a5b328890b28420e19. 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/GBAYC1500764.
Pastorale (arr. I. Stravinsky and S. Dushkin for violin and wind quartet)
Stravinsky: Histoire Du Soldat Suite - Renard
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfef45f4aff522bcdbe17f3800f53c4152d8dc1be59ae447014c876bbc29311a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/HKI190620901.
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
Sicilienne (arr. S. Dushkin for violin and piano)
5 Decades of Treasured Performances: Camilla Wicks (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x507033a548c21af5c93154a9cde9a3062ce0ea8c3372953ed98197a74c0650a6. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USA4A1400258.
3 Portraits (Arr. S. Dushkin For Violin And Piano): No. 1. Barcarolle, A Portrait Of Georges Hugnet
John Corigliano: The Red Violin Caprices/Violin Sonata/Virgil Thomson: Three Portraits/Five Ladies/Eight Portraits
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ec557cd38564982eef171fb70c22317e839dc81c9c15c48e74173ddcd39092. 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/HKI190831011.
3 Portraits (Arr. S. Dushkin For Violin And Piano): No. 2. Tango Lullaby, A Portrait Of Mlle. Alvarez de Toledo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda24cb442366aa6c82b3edec2dc554feea5ab47f62965aa3e81fce3b738abd44. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/HKI190831012.
3 Portraits (Arr. S. Dushkin For Violin And Piano): No. 3. In A Bird Cage, A Portrait Of Lise Deharme
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1e90d7f511ac689826d0405c010acdb9105fb55f1a15df966703b98cdddf37. 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/HKI190831013.