thumb|Hahn in 1906|alt=photograph of elegantly dressed white man with neat moustache and beard, wearing a hat at a jaunty angle; he has a cigarette in his right hand Reynaldo Hahn de Echenagucia (9 Au
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 0x02c6c08fd8c064bd6bf93cbcd10de80da6c8b78b564b37566de31ffeb406eba6. 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/a4babae6-6c5f-4486-a02b-68fb540ea01e.json and https://artists.proofprofile.net/proofs/artist/a4babae6-6c5f-4486-a02b-68fb540ea01e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x675ef3026a5b0cc848322a6cf432ab7d339d5ea0a08f33e8c86637af7af80536. 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/SEAEB2022080.
Bonds: Songs of the Seasons: No. 2, Winter Moon
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af3e2be81be18d318a36274348101b8b34dfdb9b6945bb4fe14a5aab2fea203. 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/GBAYC2300267.
Satie: 3 Petites pièces montées: No. 1, De l'enfance de Pantagruel. Rêverie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe12345bbd764f4cdf0dd93bd19f6a4f86be7e1175889584888287502bd390689. 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/GBAYC2301258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28bfade4f31189e27a6243160ec4e7d5dd361e3c67dd4a9a3a2fdf2bff70626a. 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/GBPFW2400013.
Mendelssohn, Fanny: 6 Lieder, Op. 7: No. 2, Erwin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa55635fffc51a92bf2f6bc4913317e11613208a1f4ca6a36465177e03763c3. 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/GBAYC2202513.
Traditional: Danny Boy (Bill Evans Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c4e917b8ceb2ad87556348cd3e97aeaf6859ae3388ac5c43dadde20b62ec35. 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/GBAYC2202382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf3fae01e3b4da09f2ca5870f390f657ce226a65dfd178667d59818192d3267. 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/GBAYC2202384.
Mendelssohn-Hensel: 6 Lieder, Op. 9: No. 6, Die Mainacht (Version for Flute and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf073d92c3adb04d2bbd95190ae6d1768a5f8665bd91d664901e036f7862621. 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/GBAYC2300199.
Barrios Mangoré: La catedral: I. Preludio saudade
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43273f553e1c0ca176e23b6ddf50b87b97c7de6ea74cd01554509e12b4c2103d. 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/GBAYC1801083.
Handel: Semele, HWV 58, Act 2: "Prepare, Then, Ye Immortal Choir" (Semele, Ino)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83912b207c7c2ebd444e45dfbcc0769fdf717f4842a8195af794a49a288e0c7c. 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/GBPFW2200086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7892784254f4e8ae8d282afc5cecfa7794e4b23e98d66318ff3a3657eca0cf1b. 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/GBAYC2203391.
Prokofiev: Suite No. 2 from Romeo and Juliet, Op. 64ter: VI. Dance of the Girls With Lillies
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd8f71338b4675349630d4a9fc64db42475a665822fe79526e84ed4d2630e467. 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/GBPFW2400097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0c56ee52e8c15104174da3186d08b387ecadf42347a31f20ea2f70cc25c125. 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/GBAYC2202514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36770f74b0b003843a90927b56a3982bafa26b8a73306e020fe341a05751ff68. 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/GBPFW2200139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc55256c062db09bb3bdc194894f91a312975f6b278e05740533b1443370589d. 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/GBAYC2202378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf9f5d00f10835869e02d48989d89e457dab2a0c77ded7e7dd24d35476745c3b. 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/GBAYC2301417.
Couperin, F: Second livre de pièces de clavecin, Sixième ordre: V. Les barricades mystérieuses
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e87c1a556f557a55489f960fecc6e289a46182cb271fa3df9dd2f3077a9756. 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/GBAYC2302251.
Handel: Esther, HWV 50b, Act 2: "Who Calls My Parting Soul from Death?" (Esther, Ahasuerus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d6cdce63f11287055e8edbf75239f1c8d5e3d841ff3660874c9999d984ca3a. 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/GBPFW2200091.
Ravel: Shéhérazade, M. 41: No. 2, La flûte enchantée
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8373086b03a06361eed7d510a3bb27cb826a362bba1abc0a234dd46d7af5fc53. 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/GBAYC2301186.
Bernstein: West Side Story: Somewhere (Arr. Penaforte for Violin and Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a61eb1dacca4aa41f91ca3c20e1af0f6e3f180d7fbd2bbda211b74ed281d2b. 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/GBAYC2400591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc101938e5db3f662629e95d3e6b76a2ea808217f2d90968c159caa920ec952e. 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/GBAYC2301888.
Satie: 3 Gymnopédies: No. 1, Lent et douloureux
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34fec988bfc8530464122e440ba4d18675f9e7ec4b0ae34f1969728a181f2c90. 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/GBAYC2301253.
Schumann: 3 Romances for Violin and Piano, Op. 22: No. 1, Andante molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f9e32ab177fdf8b6524b759f4c3534358a129498bbd62497c5385205853d459. 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/GBAYC2202511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2e2b0ddd3ddeb6d02812e0160e2dcc50cf900ec1f1c8a83c115a398f2493b4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBAYC2301796.
Ravel: Sonatine, M. 40: II. Mouvement de menuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12bc7a3687e64ccc33ac625ea73382950787831fec36186f07f72a8195cafc4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBPFW2200298.
Liszt: 12 Lieder von Schubert, S. 558: No. 9, Ständchen (After Schubert’s D. 889)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe313b5367e418f77e48547eec934e8766e480bde748cc03620c0ad988c4336d4. 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/GBPFW2100389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x708ac5a8c14f9ccca31062b33d9039ffe8685e22fb7445b9690e27460102bcfd. 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/GBAYC2301789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f29a03ddb1e533016bd270041639dafc49b574dc3e94903a95f277a8be2650e. 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/GBPFW2200130.
Debussy: Petite suite, CD 71, L. 65: I. En bateau
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a1bebbf72f7e1dc383679304957e98cb63af4305f0269b9144bbfbb25a1024. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/GBAYC2302551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a30761c731ebb9a3b2557d8bdfeaa15e1ad17e8b1b58432bf848cc29d5ed71. 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/FRZ081100146.
Poèmes "Le rossignol éperdu" (Excerpts): No. 26, Mirage
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3347af709eaa122a41c2e9a0f32ccd01903241dc066aafa13b38863d237efc6e. 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/DEAD62004714.
Premières valses: V. A l'ombre rêveuse de Chopin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7483c7d3bd5deff258a18e29c3af0625905d41e8a97461b2d1e0e5909113499c. 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/FR9W12214681.
Une revue: Los Enamorados (Arr. for Piano)
20th Century Foxtrots, Vol. 4: France & Belgium
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e12392e76e3b59d0045f558c00c08dafaf0a44e5fc9f3d5994c64958bb625c2. 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/HKI192200112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2e2b0ddd3ddeb6d02812e0160e2dcc50cf900ec1f1c8a83c115a398f2493b4. 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/GBAYC2301796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed15c89247ca81b446591f3d40d9c49c951044eba5c878ffe2919df5a670656. 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/GBAYC2301787.
Si mes vers avaient des ailes (If my songs were only winged) (arr. J. Lloyd Webber for 2 cellos and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1c2ef433aa735b212f9a4550cea42b2e6aa74eef604d739d48ef60ea582d7c. 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/HKI191331113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe401509b0d5d7f1b92a6f62e6db4e5b2b8dcd669e4ada265efb09414312dafa4. 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/FRZ081100127.