Ricardo Castro Herrera (Rafael de la Santísima Trinidad Castro Herrera) (7 February 1864 – 27 November 1907) was a Mexican concert pianist and composer, considered the last romantic of the time of Por
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 0x6fcfdd820a566d02786f2ecf1e081939067970dfd691dcd9edd42fc1186d882a. Chain 2 (Bitcoin): anchored in block 953621 (2026-06-14T09:42:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/208acc03-4cb0-4423-8f26-2fc7c35b1ed3.json and https://artists.proofprofile.net/proofs/artist/208acc03-4cb0-4423-8f26-2fc7c35b1ed3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Toda Semana: Música e Literatura na Semana de Arte Moderna
Cd Bahia Orquestral - Orquestra Juvenil da Bahia e Convidados
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 0x52e0373d88c40f698890b2329182b1eadb96f8312c0704bdf8cc681727aca2e3. 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/BR4W91300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c922d8b466a93a3987c6ccca02f2e4fdefda9859ce66ccf8c9fc22736a2aab5. 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/BR4W91300016.
Famous Piano Music - From Bach To Bartok (Digitally Remastered)
Schubert: Works for Piano Duet and Piano Solo
Fantasy in F Minor, D. 940 (Op. 103) For Piano Duet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4adf98eeca4a71f254726ee189da2b4fef0866a24600a3dd502013ba8a4de269. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960400630.
Piano Sonata No. 13 in A Major, D. 664: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a9c480a439ba3d8e8433148f0bc21005b47e613946ef5b0772881347f9d92a0. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/DEN960400613.
Piano Sonata No. 14 in A Minor, D. 784: I. Allegro giusto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffeaf8109899bbe6118620b5d0ddf118ed323ee7f6da3ad47bf81a9ddb831f8f. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DEN960400621.
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 0xa9331d743f34d440fd88d671f57c2a667a99cfa8827dd87b2f12373497e2e483. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/DEN960400640.
Piano Sonata No. 14 in A Minor, D. 784: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec5ad728dfc46a71b0e76e75b993d66d7d3da2e8f236e367a86b734c8b20045. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/DEN960400622.
Piano Sonata No. 14 in A Minor, D. 784: III. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05c1d327ced8507d28a81214f03e8f09bb803381dafc2005f4158a0d277041b9. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DEN960400623.
Allegro in A Minor, D 947 "Lebensstürme"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c957dc8630199c375f54db3c9dcf12eb92f4544afc8694bd209a7a22efcdda. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/DEN960400650.
Nocturne No. 2 in E-Flat Major, Op. 9, No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29621c368f846a68e527b32cdc2025abbb53ec74fcedbdaaa89b10e0272c35f. 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/DEP629500064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedeeb697948b592abd944866cb73a7dd9882ee38b1d771020fe7eb4ddad9c1f4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEP629700173.
Nocturne No. 1 in B-Flat Minor, Op. 9, No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215a70de8030830b00db71d06fffa5cb904a83144b134c76dbbd6f7ba11f63bb. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEP629500398.
Waltz No. 2 in A Minor, Op. 34 "Grande valse brillante"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a5db25a4381d5e61ea0052c26664c05c5d8f8874d5cb189afa5aee6b78464c. 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/USBC19300491.
Waltzes, Op. 34: No. 3 in F Major, "Valse brillante"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4723083017cf0739fd81de3804474b495556268ee54f285c4a01b41d8fe614ec. 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/USBC19100938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb24d9756ff7ec3c73ef3f3d34493f843525f90a8bcbef4b2c9e60cf95a1e850d. 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/DEP629800031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c84631f5947f6c6ae3f0c28049f710d27647d596fdb4e388dd5ed3b38aab1e7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE860901329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66724f47787e3939f61306312890ce73604af929928d442640f49707c966af0e. 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/USBC19200600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f5c44f820d6647bb01f1ec31fded9fa67c351e15076c8f922f1cc508b04b29. 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/USBC19100946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ec5635fa990faa9fb97d309e25eb426ad52ddabb937d11fbcb287db4cfbf56. 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/DEP629800030.
De Falla: El Amor Brujo, Noches En Los Jardines De Espana, El Sombrero des Tres Picos