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 0x5ec9c0dd4e7c51ebb1d84a2b505ccd9581f2c03713a73bdbcd56ffcb4d963782. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/51ac2cd4-6134-403f-bd8a-df9b65f2fba4.json and https://artists.proofprofile.net/proofs/artist/51ac2cd4-6134-403f-bd8a-df9b65f2fba4.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
La Traviata, Act I: Brindisi - "Libiamo ne' lieti calici" (Instrumental Version)
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 0x9166d106b6bf020af045b7c2c31e655621096fff62d45fe97aa9b45eb128ef09. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US5541404100 — a six-check JSON result.
The Magic Flute, K. 620, Act I: Papageno's Aria - "Der Vogelfänger bin ich ja" (Instrumental Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83859e1bd2c04e266a08038127d42ecfee434b0356145724ac8b942f93311671. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US5541404108 — a six-check JSON result.
La Traviata, Act II: Germont's Aria - "Di provenza il mar, il sol" (Instrumental Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3044a177286492443a3fecf81398665353d17c23104fd7fa5e8533ac3588bbdd. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/US5541404134 — a six-check JSON result.
Soprano Love Arias: 50 Must-Have Opera Classics
The History of Classical Era Music (100 Famous Songs)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8849d61d60ae445611dfb789daa25abb1b93aaee5a7fe48141740e425ac872cd. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBSWE1442224 — a six-check JSON result.
The Marriage of Figaro: Non so più cosa son
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef6906d88ba00e6ad8b06e257b946ab49fc3d557e9339b7c52053b95b2f70aa. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBSWE1442233 — a six-check JSON result.
The History of Sacred Music (100 Famous Songs)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2a5569174c5e12ab442e974b7d409762152a221d9931b65ecc4caed7e313f4. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/US5541503976 — a six-check JSON result.
Classical Masterpieces of the Millennium
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7905e6a3ab555967d056e41e744ffe61a5237572e85e357f67e01119616da2f3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US5541304492 — a six-check JSON result.
100 Must-Have Valentine's Day Love Song Classics
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e7276df5eed3cd98bf8ce9ab12584be2a03e6fbbfa8f3c5abca5319f2ddb7b. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/US5541301001 — a six-check JSON result.
The Four Seasons - Concerto No. 1 in E Major, Op. 8, RV 269 "Spring": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94044ddddc7d9d3e76222b1899dd4c89aa3f318a0bc5e925327e38f478ea213d. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/US5541302506 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f3fe4c5b820177c82b19b060546949e5898e41d0b6dcfb864de5b713935b006. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US5541302507 — a six-check JSON result.
La Traviata, Act I: Libiamo ne' lieti calici (Brindisi)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda3c942a23d7d810ea97d4fc2d07b073f7a893684f28208c4e489486f572e518. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US5541302508 — a six-check JSON result.
Cavalleria rusticana: Intermezzo Sinfonico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5815a0347ed0c41f942e44328dee8455013a6bda9745e03ab5d19478dae3f0d6. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/US5541302509 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024423c7ccdb42740bb69c595538a2c2e39870c19f8219dfeb1783e91be0484d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/US5541302510 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x879e1360e97e82c5cddf2a9663023a74197b0397014f31309eb5a4b6b79a2d63. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US5541302511 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae6974b70d4642f97d15b051226d930d2e1af9cf09a0a732eca9600b11d7f76. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/US5541302512 — a six-check JSON result.
String Quintet in E Major, Op. 11 No. 5, G. 275: III. Minuetto "The Celebrated Minuet"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08aa613fdf730319fe4d805c45119cbe48b7a6cb39f09e5cdefdaa5859d8d7da. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US5541302513 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33e1719185c74cc5a32dd4a08f1840e07cd40cba779ea6411b5e9b9a99729b9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US5541302514 — a six-check JSON result.
Mandolin Concerto in C Major, RV 425: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22141eafa90ed34dd81b9a44c15b2c689db17abec49ff5ab5cc4a5e900cc6568. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US5541302515 — a six-check JSON result.
Nabucco, Act III: Va pensiero (Chorus of the Hebrew Slaves)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x848fe3b3311a11b6c6bc7144da6d091f59fa628c8d3b5690bb073961338f2705. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US5541302516 — a six-check JSON result.
The Four Seasons - Concerto No. 4 in F Minor, Op. 8, RV 297 "Winter": II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c161f0d1e6468d9779844e7f87eee2ae3cf5f0b3b0eb1837c0d556d1a423e7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US5541302526 — a six-check JSON result.
Die Zauberflote (The Magic Flute), K. 620, Act II: The Queen of the Night's Aria - "Der Hölle Rache Kocht in Meinem Herzen"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a6073c0bf53be5f0596b312bfd43145f9c9ea74f5f30fd9e4e161410abf9e6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US5541301759 — a six-check JSON result.
50 Years of Hungaraton (1951-2000): Singers
The History of Italian Music (100 Famous Songs)
The Adagio Collection - 50 Calm Classics
Tokody, Ilona: Soprano Arias From Verdi, Puccini and Donizetti
The Marriage of Figaro, K. 492: Overture
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2a78e445864c6a78509feafc37ee137dbc8b2974e5bdf661dbd43b3794ba2c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US5541404302 — a six-check JSON result.
Tosca, Act II: Vissi d'arte (Instrumental Version) (From "Copycat")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7e92958718757855ccd8996f8abec97d63ab1c415684313fba1868015e635a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/US5541202734 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa14aa58bc4002e9ee21f708465ee424f6913a89cedf3a9fbff1d9174bbf3fcce. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM18800190 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5acb95397f32f193d70afbc9166a85938a0fdb5e60e36f03b16379c9089b9f09. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM18800191 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434d577a0e5e2a709b3ba84c0ffaaa89e778602d59f4d99ee3d2e99f62a96574. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM18800192 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2805bdc2345e36f6d318fa1802cb2acda427bc78bcdbc0a199a01bc428feddaa. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM18800193 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x093bdf5947c9fbdae58f05e63da52881aa68843a2b332e16a1892e5e2ca59a31. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USSM18800194 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338723130dd063bae4d5ef3e785a0b69aa7a1bf949b7258e9309f5d1b198619c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM18800195 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe50b7edc4877a32877cdce7804bde009b5daf0eee48ae733520959067983c87f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USSM18800196 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fde781708c5663bbd2b6ce932cfc85455f02b941c3f9a028819b3c05b80ec38. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM18800197 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3377c42ae4b6892c81888c76f025bb40b9a230b664a31099e381d955d0f768f3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM18800201 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3e13e3be8bd43b42dd44f34684ec4026f2f5094e811d75ed250e100c238928. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM18800205 — a six-check JSON result.
Iris: Nel cielo cominciano i primi bagliori. "Un grand' occhio mi guarda!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f46d692d4b11ce9c8cfc58fb51d7993b149a9853133ef6b5871e58bff44a2f3. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USSM18800220 — a six-check JSON result.
Haydn, J.: Symphonies / Concertos / String Quartets / The Creation (Masterpieces)
La fedelta premiata, Hob. XXVIII:10: Sinfonia
Budapest Liszt Academy of Music Chamber Chorus
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Charpentier: Te Deum / Cavalli: Laetatus Sum / Magnificat
イタリア・ロマンティック名曲集
Trumpet Concerto in E-Flat Major: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac026add51803a25c74b187904c3fcd0bc8ca3673dfed3d0fb3c9b7d4c5a8e5c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/US5540900184 — a six-check JSON result.
Petrovics: Cantata No. 1 / Cantata No. 5 / Jonas Konyve
Classical Masterpieces of the Millennium: Haydn