thumb|Kochański in 1921 Paul Kochanski (; born Fajwel Kahan; 30 August 1887 – 12 January 1934) was a Polish violinist, composer and arranger active in the United States. Training and early career
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 0x07f46688aaabf583f127a92475100289db3ac37165d0f3711eab2210ae4ebc22. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/182ce060-e3ad-4f21-aed1-daeef31033f1.json and https://artists.proofprofile.net/proofs/artist/182ce060-e3ad-4f21-aed1-daeef31033f1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
El amor brujo (Love, the Magician): No. 1. Pantomime (arr. P. Kochanski)
Piazzolla: Histoire Du Tango / Falla: 7 Canciones Populares Espanolas
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 0x540bcd565d0ca12246dd4d4d3e31665807af6b972205cdb19fc65c70c5e495ff. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA550615759.
Pavane pour une infante defunte (arr. P. Kochanski)
Violin Recital: Koljonen, Elissa Lee - Chopin, F. / Elgar, E. / Rachmaninov, S. / Kreisler, F. / Liszt, F. (Heartbreak - Romantic Encores for Violin)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f6ecc6f7b8855e9a535d9dfed19bba92501bbbfc8f311eb0cb2130342a19536. 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/USB8U1032106.
7 Canciones populares espanolas (arr. P. Kochanski for violin and piano): El Pano moruno
Falla: Popular Spanish Suite / Piano Pieces / Harpsichord Concerto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x584c564a794a7a535e21b3d77b07d1d26bfec0db28a57ee1b583470d44565575. 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/HKI199752401.