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 0x580132a5d836fbd52b46a39cd54ba25e1344a38141ba958934451576f21ab83f. 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/26de0d82-6503-4f1b-9ccb-ddc5bd818659.json and https://artists.proofprofile.net/proofs/artist/26de0d82-6503-4f1b-9ccb-ddc5bd818659.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Marie-Joseph Canteloube: Chants d'Auvergne et chants des Pays Basques
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 0x1a49c76f9673349687eabdb8e5638a273fb9aa5229d479947aff5015854f5503. 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/FR10S1798087.
Madrigali amorosi: No. 9, Canzonetta by Rinuccini, Lamento della Ninfa (extrait)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf763e0ddd4561ae94fd0cee00b40ac6b3c4fe17d5e132d6b02f2a88566c6e540. 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/FRZ130948200.
Albéniz, Falla, Poulenc, Ravel, Rodrigo & Satie: Paris Barcelone - From Gaudi to Miro
La Taberna del Puerto, Act II, Scene 2: En un País de Fábula (Marola, Juan, Simpson, Coro de hombres)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523dc99c142fc6de6f432ffd1f24559e44d3981ffcdbf51d1941e8b876cc6c73. 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/FR2X41717941.
King Arthur: Act III, scene 2: Cold Song. Genius : "What Power art thou"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff61e29053a083a824282c24231f5ca9a9507003bb38d1d4921614d9cf38927. 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/FRZ147801071.
Griselda: Act II, scene 1: Griselda : "Mi rivedi, o selva ombrosa"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426f176657b253e86ad3d5364d9caa268ea81a5f46def249f393179f9d18a4a9. 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/FRZ140230011.
Boccherini, Soler, Nebra & Hita: Arias de zarzuela barroca
Rossini: Highlights from his early One-Act Operas
Coro Polifonico De La Universidad De La Laguna
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00df93a5d3231e67bd091768b03d21ae492b7a3f770f63697fed8d738959c3eb. 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/FRZ139310530.
Coral "reyes Bartlet" De Puerto De La Cruz
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7acfc67ea736f7aaf52025db45080493636646144883f3f58ec0919269b554f8. 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/FRZ139311384.
El Barberillo de Lavapies: Jota de los Estudiantes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf1b0252bf98d1223592bad4f87614dc453630aec0305ac8c679df7c953f19e5. 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/FRZ139410880.
El Barberillo de Lavapies: Entrada de Paloma
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86498ca0a106320e88fb3eb5346ea7f766d226de8c5fe4630871eafafbae5fe5. 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/FRZ139410850.
Luisa Fernanda: Mazurka de las Sombrillas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5739232dfc371113852bc13b3a26e923ba13c86448f00515185f17c2a046d9a. 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/FRZ139500564.
España: Albéniz, Falla, Gerhard, Granados, Rodrigo
Cantos de España, Op. 232: No. 5, Seguidillas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e61b1dbcdc819511e6e94d2697163a1fef2072bc8742ec2f4fce51028ca0be8. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FRX201662634.
Rossini: L'occasione fa il ladro, Early One-Act Operas, Vol. 3/5
Da Tempeste Il Legno Infranto (Cleopatre, Giulio Cesare)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e8620a7eb3ac8dcf6e31f0392603e4d5f9db0613a73c1187189b6a2dd22be91. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/FRZ139900070.
Cantata HWV 170 Lascia Ch'io Pianga - Rinaldo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b0cd0b2a477398c491cbb67664b14eeefc77bfd603ebf7fb0a2f4d3b81fc59. 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/FRZ139900090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675113f450664d4824114de49e95c4d2cf5e78fff68a38b54139a1e77080a4a8. 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/FR10S1732203.
Exsultate jubilate: Dix siècles de musique sacrée
Suite espagnole for Piano, Op. 47: No. 5, Asturias (Leyenda)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2356b157ebb456b61022037a8af7dfc328424f44cf2338516c1883d7aebfab08. 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/FRZ139210310.
12 Spanish Dances for Piano, Op. 37: No. 5 in E Minor, Andantino quasi allegretto, "Andaluza"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69747075e90ca2658004bcec32666d1d2ee9b6257fcdcf061405c980416b00a3. 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/FRZ139310710.
Antón García Abril: Canción Española de Concierto (Volumen 3)
Palomo, L.: My Secluded Garden / Madrigal and 5 Sephardic Songs / Concierto De Cienfuegos
La Calisto, Act I Scene 2: Piante ombrose (Calisto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e96e96e42e17f11a54367420734a15e067d215670b5529d90b129be32cca0cb. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/FRZ149413050.
Turina: Vol. III. Selected Chamber Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0b1daca0a28a6a4cf3346a2d25546f6ef3b28e196329a48f37c30d85fd6ad1. 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/USA560679145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd978654f1147f1fd26c2a805923f13ebafab95cdcfc21ac343730a4ea8cddde7. 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/FR10S1754986.
La Verbena de la Paloma, Act I: Parlato et scène (Hilarión, Sebastián, Julián, Rita, Tabernero, Mozo 1, Mozo 2)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d242212d8ed8923d3f74c2770366dba88d6c8a44f23749b865dd5e3a2fd3319. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:45:08Z), 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/FR10S1754987.
La Verbena de la Paloma, Act I: Chanson de Julián (Julián, Rita, Hilarión, Sebastián, Tabernero, Mozos, Portero, Portera, Chœur)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7aa1eba2ecf74f3d3a3fee33c587af22ab741dd13bf758cda0871e5975f1521. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FR10S1754988.
La Verbena de la Paloma, Act I: La Virgen de la Paloma (Chœur)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ebc37819da252a277207c8fc0e8d4c887a7714218df7895eedf6891bf426ff. 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/FR10S1754989.
La Verbena de la Paloma, Act I: Couplets de Don Hilarión (Hilarón)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25cf8da467f53449eb5d54aa607e67d577dbf8449559bad9e8419d6bf54c9ef6. 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/FR10S1754990.
La Verbena de la Paloma, Act I: Soledad (Cantaora, Guardia 1, Guardia 2, Antonia, Casta, Susana, Vecina, Vecino)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5b1c2c291363515982be3c3daf5102524834efd8373aaaefe7cc654b59d41f. 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/FR10S1754991.
La Verbena de la Paloma, Act I: Gigolettes et Don Hilarón (Hilarón, Casta, Susana, Antonia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eca96a6b8d16323c752b12350bee6f7ed3a36c25575aa96f5b3682d3daf99db. 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/FR10S1754993.
La Verbena de la Paloma, Act I: Mazurka (Casta, Susana, Antonia, Hilarión)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ec316ce36ef3305b0a58b36b9ea069d2b80944f3d32d4f7937d251615bd26d. 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/FR10S1754994.
La Verbena de la Paloma, Act I: Rita y Julián (Rita, Julián, Guardia 1, Guardia 2, Casta, Susana, Antonia, Hilarión)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a3e117af9992c550efbeaa7825754d6375f5b59c582cad0a7d1652968b4813. 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/FR10S1754995.
La Verbena de la Paloma, Act I: Habanera Concertante (Julián, Susana, Rita, Hilarión, Antonia, Casta, Guardias, Tabernero, Sereno, Chœur)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b00d830f6ded3d22da89c1a687a132dcf3b9e3d81e093962f57da98d38ece0b. 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/FR10S1754997.
Basque Music Collection, Vol. III: Jesus Arambarri