Jean-Jacques Kantorow (born 3 October 1945) is a French violinist and conductor. His son is the pianist Alexandre Kantorow. Biography Kantorow was born in Cannes, France, into a family of Russian-
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 0xdd43ee860e583d3234cb2358a8bc988900436806435f2091354a35fe45f46a9e. 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/1977ea4d-0ad5-4fa6-8c42-7a295e343caa.json and https://artists.proofprofile.net/proofs/artist/1977ea4d-0ad5-4fa6-8c42-7a295e343caa.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Saint-Saëns: Works for Piano & Orchestra
Piano Concerto No. 2 in G Minor, Op. 22, R. 190: I. Andante sostenuto
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 0x0690422c8b257e6e1ece6536b10068b058b4d256280a375a878d5ddca9113797. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA2200010 — a six-check JSON result.
Piano Concerto No. 2 in G Minor, Op. 22, R. 190: II. Allegro scherzando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c877da08dd20c1ae44d5eb758c43722a26f7eb4f948f17f7b94663e035f1a0. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA2200020 — a six-check JSON result.
Piano Concerto No. 2 in G Minor, Op. 22, R. 190: III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0569f03b24c7475e5cfe631fcc61ba23d8a2ef693a88c44f342e1de66712ebf7. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA2200030 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f13912dcdb6563b4d318e9940ad4857daac6bd42018e883f0b8e7c79a15c0a8. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA2200040 — a six-check JSON result.
Allegro appassionato in C-Sharp Minor, Op. 70, R. 37
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b4f35e6eba90779be384ea32ffed1251aa9cf1d780220115bd67baaff4a2fa. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA2200050 — a six-check JSON result.
Piano Concerto No. 1 in D Major, Op. 17, R. 185: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d13d15bf58c1a99b84cc312720c1a15eb83d1d1700aaaedd0f6c5809ebceeee. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA2200060 — a six-check JSON result.
Piano Concerto No. 1 in D Major, Op. 17, R. 185: II. Andante sostenuto, quasi adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c72f4d4d0b73321cc78ea999a5712a30411525bb3b333d042bd10a07cd40eec. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA2200070 — a six-check JSON result.
Piano Concerto No. 1 in D Major, Op. 17, R. 185: III. Allegro con fuoco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e296a8afa31c39c281dd25d74c68e58a2d3109facf4abd09cdd7784ce3937c5. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA2200080 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea907d3e62c12deac0d375c85ac944b444140b947f0beaf44cf886eefbe4b38. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA2200090 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8010da67ddb18bba3898eafcc3f80a9ae2a3ecb1c63af81b19d21e3aab2610d8. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA2200100 — a six-check JSON result.
Rêves - Ysaÿe: Violin Concerto in E Minor, Poème Concertant
Violin Concerto in E Minor: I. Allegro appassionato non troppo vivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71cb3c8091d2eced1d0921681647afcf7eab0a58e8cd68510b4c3be54025c2a1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBELX2308711 — a six-check JSON result.
Symphony No. 3 in C Minor, Op. 78, R. 176 "Organ": I. Adagio - Allegro moderato - Poco adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c857cfeed72d572125e73606dbcc7487a8b74d680fb92e8b7f451e53d5b38b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEA2170050 — a six-check JSON result.
Lalo: Violin Concerto, Fantaisie norvegienne & Symphonie espagnole
Palomo: Cantos del alma & Sinfonia a Granada
Harp Concerto in C Minor: I.Allegro spiritoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972cbfadb615d9584d63e6290b8508b753cb804d30b3d270f46589fe800a12ef. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9203225 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a6970a540f77d3b02e24bf8a8d7edebc2ed279a51ca13870392bc1bbf4a3e6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9203227 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bac5acc11e1d3834825bcc8a905f3c8e6b8214cd84753b2e00773156d323084. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEI9634040 — a six-check JSON result.
Harp Concerto in B-Flat Major, HWV 294: I. Andante - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdedbc655a3822b4eadc7ab74a31a2b1b3b426ae7a13f390361ab298cab1c363c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9203213 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c419d9f95bc90206503625cd6f49c8802df41712a76eeff652b5b0e1112d910. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEI9634060 — a six-check JSON result.
Harp Concerto in B-Flat Major, HWV 294: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48cfbb6f68df727368e06ec3b4b4c728f1b931817af16bf245cede039f999a92. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9203214 — a six-check JSON result.