Xavier Montsalvatge i Bassols (; 11 March 1912 – 7 May 2002) was a Spanish composer and music critic. He was one of the most influential figures in Catalan music during the latter half of the 20th cen
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 0xf1f5bc82204615fb1bbbc530e65f490a0ae26e704bc1ba39604180165429d737. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/33dc3d01-dc98-4967-a40b-007b790acf1b.json and https://artists.proofprofile.net/proofs/artist/33dc3d01-dc98-4967-a40b-007b790acf1b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Victoria de los Ángeles in Concert (Live, Royal Festival Hall, 1964)
Carmen, WD 31 / Act I: "L'amour est un oiseau rebelle" (Havanaise)
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 0x2f264d83986556c4a5044438bcafb7b12146ef12602a14eae67129423b779dfd. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEN961000650.
Asturiana - Songs from Spain and Argentina
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc57508c5b356a3f360c5a6911b7e3021d0fd1bcdc68b850528002ac859d6f3. 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/DEB330697501.
Smörgasbord: Encores and Short Pieces for Cello and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97fa6db44f0fe65529be33ad1273648b62f5303de6745dbfb945e8009e8c5be4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079812140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a7eae1880f5e1c87ab05d6c4cdffdd5e7e13b06f38bb89c519410730756be9. 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/GBF079812210.
Carmen / Act 1: "Près des remparts de Séville"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8f300828ca4de5944aade5455f8d409eaa307b8452efead74a6af12ce54b83. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079812330.
Cantos de España: Falla, Granados, Rodrigo, Esplá & Montsalvatge
Montsalvatge: Complete Works for Violin & Piano
Monsalvatge: Manfred - Bric-à-brac - Sinfonía de rèquiem
Montsalvatge & Mompou: Obres per a Piano
Xavier Montsalvatge: Viatge a la Lluna & L'Arca de Noè
Montsalvatge: Partita 1958, Cinco Cancione Negras, Calidoscopi simfònic & Simfonia de Rèquiem
Montsalvatge: Piano Music, Vol. 3: Music for 2 Pianos
Xavier Montsalvatge: Complete Works Violin & Piano - Violoncello & Piano
Montsalvatge: Laberinto; Folia daliniana; Sortilegis; Simfonia mediterrània
Xavier Montsalvatge: Complete Works for Piano
Montsalvatge: Concierto Breve / Rodrigo: Zarabanda
Cinco Canciones Negras: IV. Canción De Cuna Para Dormir a un Negrito
X. Montsalvatge: Tres Divertimentos Sobre Temas de Autores Olvidados: No. 2 Habanera
Canción de Cuna para Dormir a un Negrito
Canción de Cuna para Dormir a un Negrito (Arr. for Piano Solo)
Montsalvatge: Partita 1958, Cant Espiritual, Desintegració Morfològica de la Xacona de Johann Sebastian Bach
5 Lieder, Op. 49: No. 4, Wiegenlied (Arr. A. Spalding)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c07b23fa24b6bcfaad251977ee15230b7706f4b8c3a283a67630c47473fc23. 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/USB8U1053452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c5eb2d9c6a6d32fb260635478633f80f47cb054837f9813aa853d2876b6291. 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/USB8U1053454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df2359c5d182793ea0b7c4facfeacf464f81cdd528387b4841447db497e7290. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USB8U1053455.
Siete canciones populares españolas: VI. Nana - for alto and piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9804d0f776189d31f26897edfb4c137ec6ccaf49d26affb9347ec647bcc96132. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR7JM1955120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aebedd5a29bc146fed4625142e561d53f11da28786428eb6d227fe1995fc79e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USCRS1799113.
12 Danzas españolas, Op. 37, H. 142: No. 2, Oriental (Arr. for Violin & Piano by Anonymous)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64da2b4fe55c65ac192c0ebf93260865f1b99c79ede0adc7d2da245e0165e8e2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HKI192353609.
Ravel: Daphnis et Chloé, M. 57d: Danse légère et gracieuse de Daphnis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96592e0002bf1bef3bc9f2b88ca4791d8c091468c9417d3f801d07f9e5db0551. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2402735.
Nin: 5 Comentários: No. 1, Mensaje a Ravel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x321843eb41075f4e8b31936a52713b1cdfb028ac531674c0b021517dbc863a33. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2402744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb819709c7a896c6b21ff5ae1db177b0fc5fd86b9b3d2de7271827098438bc672. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBAYC2402740.
Montsalvatge: Lullaby (Canción de cuna para dormir un negrito)
Cinco canciones negras (Xavier Montsalvatge)
Montsalvatge: Cinco canciones negras: No. 5, Canto negro