Charles Bruck (2 May 1911 – 16 July 1995) was a French-American conductor and teacher. Bruck was born in a Jewish family in Temesvár, Banat, then in the Kingdom of Hungary, part of Austro-Hungarian E
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 0x43ca52e0fdd8023132c75805621aff36a87bf4ce3786273c606a7f69cec68032. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a6ce0fad-559f-4861-93b8-c578176e76bd.json and https://artists.proofprofile.net/proofs/artist/a6ce0fad-559f-4861-93b8-c578176e76bd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Lalo: Symphonie espagnole in D Minor, Op. 21: II. Scherzando. Allegro molto
Orchestre De La Société Des Concerts Du Conservatoire
The Art of Leonid Kogan: Violin Concertos
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 0xd089b98fa9a9bbd1a5a2196029c65e253d3df79f51b3b3b709dbb0c3c2b6d9a6. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/FRZ110600254.
Lalo: Symphonie espagnole in D Minor, Op. 21: III. Intermezzo. Allegro non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995d61ffd09e32b7b7f5b8a040be9068f698a1663a350370817fe10df4340055. 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/FRZ110600255.
Lalo: Symphonie espagnole in D Minor, Op. 21: V. Rondo. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb054d0ac1d1183b7a1a5242c7b299c9cb2a3b512cb5ce39c7c34fc1a654cd62. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FRZ110600257.
Paganini: Violin Concerto No. 1 in D Major, Op. 6: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x015da4465f7cf7bad1ad43bfc41f97effbf40b893653a4e6a6bbcc3c779195f3. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FRZ110600251.
Brahms: Violin Concerto in D Major, Op. 77: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d0474e928f810cde5c05056e84aade674e6117f7dd05900639bb218ab736f7. 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/FRZ110600259.
Brahms: Violin Concerto in D Major, Op. 77: III. Allegro giocoso, ma non troppo vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9da93f2143ff13d7124509c486261f7abef8dc0383cfa1d873941f1229946e. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FRZ110600260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6b904c26701a3276679937dcc64614ce2b7919041ac49e7d8fa676790e0c2be. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FRZ202200457.
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
Lalo: Symphonie espagnole in D Minor, Op. 21: I. Allegro non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5ddade06d46669913bc32bac3f5ef8a2efc05a88b1ed3db6d33a191419d8de. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FRZ110600253.
Lalo: Symphonie espagnole in D Minor, Op. 21: IV. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5942a466b85fcb51430881ccc2ab87d67fd2b817804c63d3dd28be6f72227765. 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/FRZ110600256.
Paganini: Violin Concerto No. 1 in D Major, Op. 6 : I. Allegro maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7b0cb6d649d56456d79151a2eb545236c86c0293b46cb85b4d601af9f7e462d. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FRZ110600250.
Paganini: Violin Concerto No. 1 in D Major, Op. 6: III. Rondo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55e08b10533d8f89b1388b59fca5e85fd655b704db2da455f015130917f7792. 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/FRZ110600252.
Brahms: Violin Concerto in D Major, Op. 77: I. Allegro non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3ab37ca562d514a54be125d7744db8e31addc1805dffa4d44f6055ad62f004. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FRZ110600258.