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 0x88ca248c6d475396aa62dba2ac0be75f29b1710f8a7d7a044cc7f2fb233e7248. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/916a2392-7dac-4ee9-bf03-9e24ef98ad24.json and https://artists.proofprofile.net/proofs/artist/916a2392-7dac-4ee9-bf03-9e24ef98ad24.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272d9219ca4be3732dcfb4bba887f2b72183f789405c296b80d4b846b0e0b21a. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/ITH670500267.
Semiramide, Act 1: III. Quartetto "Di tante regi e popoli"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07efb6a50ed9d687eb1205a59035abaa0ded3f74827e1c75e6acee4aabd8fe7a. 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/ITH670500269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac374c93b61c6e678477df7cc80ec1f336a3411582b213f6efca7e65ac349d14. 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/ITH670500274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1f6b5deba488dd060bc0eeec44149f3a8cd2f3e18306fc366c7abd2fc09e44. 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/ITH670500276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa2592a3be6ea4196c2866feb78f9f111510bb6633327a425abeb39df0411dfc. 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/ITH670500277.
Air varié de l'opera de Bellini "I Capuleti e I Montecchi": Variation 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3efb1b350a489930041f46cb51096cfa5761369ed874e959051d4c1e17799a. 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/ITH670500279.
6 Mélodies Nocturnes Originales, Op. 41a: No. 1, Le Souvenir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3ce597fcb16bd418d5bfb0f6ddce3d21c4fbe7853567d1abbffefb50610968. 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/ITH670500282.
Fandango, Danse Espagnole, Op. 73: No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4d88e5109c2bfa6b520c5dcac9a356ab4abdd83fba967282db5ae8ac05093a. 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/ITH670500283.
Ghiribizzi, Ms 43: No. 8 in C Major. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b198bd1c924a37719d456048ca08756055b6224c11a5d6fa1a2b02a23400f79. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ITH670500268.
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 0x4a520713c82ebe839b1d853dc404503901fca6c173352070d6b6ad6158331d59. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/ITH670500270.
24 Studi, Op. 48: No. 5 in E Minor, Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de5ed5f12258fcc9b9bbde13e0ddcfd66d075c76aa7979bd0ce1743d1230707. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ITH670500271.
36 Caprices, Op. 20: XXIV. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0470021db89a71763bea7da5c2dedab5f01e8db9303c0e9435e52eee2087cae. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITH670500272.
Sonata No. 49 in C-Sharp Minor, Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c23a447796f6a061ae4e937efc9198a5ed7004d03dc9664bda0f8ea98c5268. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/ITH670500273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x922e4a4ea1677b900d14a0344a1a34a55f6af3e3469a9cd9e8850f935a79d407. 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/ITH670500500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bbd456242e046d0a8ce839f348b3d45639630b32ec025a3d3b4c5b87edf41cb. 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/ITH670500504.
Preludios Epigramaticos: No. 4, “Ríe, que todo ríe; que todo es madre leve”
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d12810daea68eb7080682f5ac9de5d62c77bae1e31a8982eaafb22956a20498. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITH670500498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb108bdaec20291e09b3f5a82769cfb26ae08b4ced680ddf856961c1698c3ab. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITH670500499.
22 Studi per Chitarra: Studio No. 11 in G Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9148a57e1fa5a7fb7c4f248943fc2bb2b0891706ff1af3133fedc94e2ab394a1. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/ITH670500507.
El Choclo - Arr. for guitar by M. Kemal Duzgoren
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8419bfdcedae900c7c7b2e9585749284241c7529f42e89509149e06de78274de. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITH670500510.