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 0x5882f5bdeeabea463e90bb5b71c70d836ce82ab2e793d12cb0cb0f77beed145e. Chain 2 (Bitcoin): anchored in block 954028 (2026-06-17T01:08:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3a1f7846-d423-40fa-b100-aefefacbe430.json and https://artists.proofprofile.net/proofs/artist/3a1f7846-d423-40fa-b100-aefefacbe430.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rocco and His Brothers (Original Film Soundtrack)
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 0xaf97cd3b1572ed0c60a5c500f260267155f6100227bde22bc37bdb107fea4d81. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/GBURF1401862.
Le Notti di Cabiria' (Original Motion Picture Soundtrack) [1957]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcefa7bec29bc788d82d77a31dd5e1c207aad6ea21edcca5dc06dcd503bde4a0. 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/CA5KR2138243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799b230e61a822f51c60c914d766fe834cd77fcc1fe7ad3a573cffbaaed6ab9b. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CA5KR2138244.
Cabiria e il ragioniere - Frà giovanni - Sulla strada
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba11e48bee47706dc0460bbc433812ef29ddf0d5edbb9e3aed07724f85c084b3. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/CA5KR2138245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa101decd107a956b0fe18376bf33d20856908014b5d0805b16b4262471eb17c. 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/CA5KR2138246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2cfc19ae260598dd0462142a212c1634487ef9c4e1655f06fe9e5c137c9094. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR2138247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da57dc1bcea2fc50e05077373489f0082328b1c1f0ade858d3c7dc8e97034a6. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR2138248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba0f4e363da3b9a6cd5110addcc3c5cf5e2873a59e1b8c01aee67ff4071b2b9d. 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/CA5KR2138249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c3a1228c636a4a51aea763a9863339c3590b9be5f1f3d843e413fa0ab91229. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/CA5KR2138250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819b9f6a513839e71e71c416d0a26a77271c2da90d65c44e686248771f208389. 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/CA5KR2138251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7b1af0836bd797ead9a79ae0aecbf39befcc05d4f60bcb959c8b6df473fab1. 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/CA5KR2138252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d4fe465163de5e295135d5057dfcff29a2e3744c493417b1bbb07684f6e1d75. 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/CA5KR2138253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e4ee0fd857438101f958e859cc80a5a9b1efd441be25370556ea501d3a0d63. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/CA5KR2138254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9e69f9f0495d03e74d33d39dfe0b78a063931d08155ee782030c9502144e5e. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/CA5KR2138255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a4f505f6d6b36249f83371574c10c27b1b87a059ef91339042685c06e5beda. 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/CA5KR2138256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe106e74ddcdf44ffef10595d3d7dea963ea66e2f1a96e198e6f2b7aa7bbcc69. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/CA5KR2138257.
A Farewell To Arms (Original Motion Picture Soundtrack) [1957]