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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d32e3c47b2c9e6575d8c630b4ae56e05a811152760980adcf70e7725ed04a72. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fc9e0ae3-a95f-4165-8d9c-686947e7685a.json and https://artists.proofprofile.net/proofs/artist/fc9e0ae3-a95f-4165-8d9c-686947e7685a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Tientos y Glosas en Iberia (Orgue Fontanes de Maqueixa de Sao Vincente à Lisbonne)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1d557997b3a12c98a6b838c95d2c82a55e1b1c25675b37e0768878be330622. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/MX2831000639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4400bfe8f60c8f4caaedc46b73dc7322814f4658a20e8d7951f1d1b77430f659. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/MX2831000653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd370b000a5496b943d904c9a9019fc3745b610d782d2f2499aadf27a595e50c. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/MX2831000655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba1ad8627416ac658a828a7dd233e0d932ab3d7e89bd610080e2dd580fa7b33. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/MX2831000641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b103d70fb84770737dd6b5040af02a13241abca94ae82edf8d642389b945d30. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/MX2831000656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6748cf6e506f1c2f1ede3a8068badd2f5ff64b81e6f4b9d80a65c00f4ad46705. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/MX2831000658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0dd8e0eb26ffda8b390b7caae74da3060ab22827aef6309297757d98d2290f7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MX2831000645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed3e542f0522ccc161d8fb1b78b9370ce6aba816c6938ee0e66ebf34befc0d55. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/MX2831000646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53a05d18e9d27fad6a95d0ad0c5327d4f23cd0e47a598c5f70119c87df87823b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/MX2831000652.
1160-1245 Pérotin et l'école de Notre Dame
Cléreau: Les Odes de Pierre de Ronsard à 3 parties: No. 9, La lune est coustumiere De naistre tous les mois
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0287cb29d9eee4ee35562ddcd63e50b48e189b30b7418c3e6e8194cb84562f. 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/GBAYC0003138.
Le Jeune: Le printemps: No. 2, Revecy venir du printans
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c4f3fc6b11a23b9336a9b94eedd08941d5da7a09ba638c5809811958739dfd. 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/GBAYC0003140.
Certon: Que n'est-elle auprés de moy (from "Neufiesme livre contenant XXVIII chansons nouvelles à quatre parties, P. Attaingnant et H. Jullet, 1542")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5f2130a9b8b70636a0304e472faaa9e220598ef101407aef2c15cf4dfa2c10. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBAYC0003141.
Des Prez: La plus des plus (No. 70 from "Harmonice Musices Odhecaton, Canti A")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5217b716083c95395e20e7f702664d465bf2907d39f96fb636ed266b215e7d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBAYC0003142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x712328aace064ca9b10f0b31ca4574151645806e9906184455072cc6fc6870a4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBAYC0003145.
Cancionero de Palacio (Madrid, Palacio Real, ca 1500/1520): Enemiga le soy madre (S, lute)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c7edde65be64284b142d422d49cbb1f8d26d0f8f71117e5d1c0d861e72a015. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9601266.
Pérotin et l'école de Notre Dame (1160-1245)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a99fe85fa1f1181b5e865e2802ba89d0af2d6b3255161e384052fbc564f2ad. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FRZ130080020.
Alphonse X el Sabio (Cantigas de Santa María)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd9eab8e056002ee4563ebb5e0db51aabec984e6de9185969161de6ac9bda33. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ130380250.
Alphonse X el Sabio (Cantigas de Santa Maria)
Music and Poetry in St Gallen: Sequences and Tropes (9th Century)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08414de557eb12d7ca0014f10b61c1a39a66cef4d68dd4a6a2efed7be3a9e1ef. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/ES7891001306.
L'Amor de Lonh: Medieval Songs of Love and Loss
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c7db88b753251075645acfbc0bcfdbb7b2868fd9a9945957f430f8b28b920b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7891001005.
Voix du Ciel: Polyphonies médiévales et chants sacrés
Voices of Heaven: Sacred & Medieval Chants
Timor Mortis (D'Argentil, Sermisy, Barra)
Meditation Music: Meditative Music Across Ten Centuries
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2b7f0aebd0f57bf3f7f57a71588cc04378d1b99d15a46ab40e0388124d0692. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7141500233.
Messe de la Nativité: Antienne Ecce annuntio vobis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ab39c945bc0dfa6ff1302188bafcece56822ffcd9fddab02f04ab1f988c8a3. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBAYC9400613.
Messe de Nostre Dame: Introitus. Gaudeamus omnes in domino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880c164927817a1a4acd9c7ea1aea1ca03c14d6d226d60a1afe8ab8e8604db00. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NLY331111846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c66bbcc1d378a4b2f4f5b689a2f9314dfffc9ed94d55b23077d230ab2328376. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/NLY331111847.
Messe de Nostre Dame: Gloria in excelsis deo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65eac926e4460ee3d441684116ff8d3906589b6561ce4d6a17df3e53a0532185. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331111848.
Messe de Nostre Dame: Collectio. Veneranda nobis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb98e3f1c047a02a23a8495a8d7c0661436df523de81693d546855eb3f45ccb1. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLY331111849.