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 0x36e74eb35dead71cdb940fe62e98330a6556e4a44f33472957468c5ff6da4371. 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/22000b81-ac33-4d78-b618-36d44d28524a.json and https://artists.proofprofile.net/proofs/artist/22000b81-ac33-4d78-b618-36d44d28524a.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Mozart, Tchaikovsky, Beethoven. Pequeños Maestros de la Música Clásica para Niños y Bebés.
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 0xa3eee9535e1910f8522b2155cc397ee607f5e03c4e9ca4c7b1e62f589714844c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGJ1723889 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a09d8a41719fe324c1c2e21e09607db0bb5f8e3fafa4c20176d14d764e338ec. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGJ1723911 — a six-check JSON result.
Sonata para Piano, K 331: Rondo All Turca
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b9a55dfc1b05865c708499b4efa045d46d789254f361ca9a4496b3795825b9. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/USCGJ1723875 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75284092501a890c627b7386ec6982afb9b9368c366b24908f2a17913a7d1e7. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/USCGJ1723891 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0c782e541b130d8938b7e09a780c36bd0d23ab49ea9f1258eb9b0c81b50f61. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USCGJ1723876 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dab868e04b3ab487be31042e27b0bda5fe7a20e5e54059de622aff41903b541. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGJ1723914 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59703b068c8b6776500c358157dc244165c14c38f1a510dac623e17794d9b557. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGJ1723877 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5389f3562a7596fce73cca2979e304c8b99c8c2c32606e5ef492e5ace01b6e3. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGJ1723878 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb021f47a80ca1e09713c1222fffe8b51fc0a38617b8d675cdb8e6b359fa6558b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USCGJ1723879 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72c3a7e6f7e30138c2be560c5bea789756eef9caa0bbb924c4450e10ac076f8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGJ1723881 — a six-check JSON result.
Vivaldi, Chopin y Bach. Pequeños Maestros de la Música Clásica para Niños y Bebés.
Suite Orquestal No. 2 en B Menor, BWV 1067: VII. Badinerie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7dbeaafceae5924a078db7d8a1b0659bfbca453acb40e32dc9af1ca2c9bf3d5. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/USHM81894565 — a six-check JSON result.
Fantaisie-Impromptu en C-Sharp Minor, Op. 66
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed5067bd6a5394967a53acc8614c424622325d58a2081265df5e8910dc81631. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/USHM81894569 — a six-check JSON result.
Concierto para 4 Violines en E Minor, Op. 3 No. 10, RV 550: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5977bffffcd3a17b16e2104f65145b9a95080dac7a3e317a6319031bafc1d86. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/USHM81894570 — a six-check JSON result.
Nocturno No. 2 Nocturnes, Op. 9: Nocturne No. 2 in E-Flat Major (Andante)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a5ef7c273a32acc986b52b47907b4122e20966c0e8bc21594bb2e393b9cb5e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USHM81894577 — a six-check JSON result.
Pequeños Maestros. Hits de la Música Clásica para Niños y Bebés. Mozart, Beethoven, Tchaikvosky, Vivaldi, Chopin, Bach y Otros
Rigoletto, Acto III: "La donna è mobile"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2102e4622b93f72f59c331572613424e85843b827b54eeba8053d28aa32a0ec. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM91888248 — a six-check JSON result.
Las Cuatro Estaciones: Primavera. Concierto para Violín en Mi Mayor, Rv 269: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83cdb4d5d9576e24943bd42f9e83113129b42a4a119eb267a63a833fee8be000. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/USHM91888269 — a six-check JSON result.
Pequeños Maestros de la Música Clásica para Niños y Bebés. Verdi, Rossini, Schubert y Otros
Pequeños Maestros de la Música Clásica ¡todos a Aprender! para Niños y Bebés Beethoven – Vivaldi – Mozart – Tchaikovsky y Sus Amigos (Música para la estimulación temprana)
Pequeños Maestros de la Música Clásica ¡todos a Dormir! para Niños y Bebés Beethoven – Vivaldi – Mozart – Tchaikovsky y Sus Amigos (Música para Relajarse a la Hora de Dormir)
Pequeños Maestros de la Música Clásica ¡todos a Jugar! para Niños y Bebés Beethoven – Vivaldi – Mozart – Tchaikovsky y Sus Amigos (Música divertida para la hora de jugar)
Pequeños Maestros de la Música Clásica ¡Todos a Bailar! para Niños y Bebés Beethoven – Vivaldi – Mozart – Tchaikovski y Otros (Música Divertida para Bailar)
Pequeños Maestros de la Música Clásica ¡Todos a Comer! para Niños y Bebés Beethoven, Vivaldi, Mozart, Tchaikovski y Sus Amigos (Música para Relajarse a la Hora de Comer)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c8661aff3d3522dd640a6a557d4913698cb0c27d3cc022f3b0e65e1d6762f6. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USCGJ1723908 — a six-check JSON result.