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 0x3bdcb11f358b2ae04196c11ec3f576786515f58fa4ac602c5a52d0d9ba6400dd. 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/0c1c8c5c-ebea-4fd4-9a31-a8bb823afef4.json and https://artists.proofprofile.net/proofs/artist/0c1c8c5c-ebea-4fd4-9a31-a8bb823afef4.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 0xea66b65b3110201898b714e1d5039f54a183883b1e50d6e39951a1830f34ecfb. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM3DF2172662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66b45934e79c3ae7854275c77668a8897a3f87746d0ed13d5eb2d37b927a5cc. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QM3DF2192717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928d932a3b061edfc56eb518fc0162b728a4c9a144b66da82758322f2704a343. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/DEZC62265012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d40245c1daf4b4e5424cf3aa9369378fb349fa0ee627e2a81b8d1a75d587c1. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/US3DF2254042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a53022d9db2a2fd992fa18104fe714c131ebfe4e37a06582a7518c52b92a7a2. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/US3DF2254043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafdb258d29e6fea11aea6f1c9ff8e5d2e8df8a769131ec011cf6bb8e63e6da07. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/US3DF2259128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e390d211b1689649c9134843dd9a64ea34a227840e2f9c68a79d80afab9384. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/US3DF2299112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5dcb707f9e0cd70b4f974b06048a904720e82a2d3b7181f45f1062d83e6810f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEQ022290961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2bd94a33fe6cd5fb72031b2fe60e488451859b7af12462cbb67d40d87a4a8b. Chain 2 (Bitcoin): anchored in block 956405 (2026-07-02T22:22:35Z), 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/USANG2226944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9955fbb344793f965be73ece899bd81b0352eb6e9eab5590ba343b8562704624. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/DEZC62319058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f3f71d48274adf0cf8546fafd87f41e816effcefca98f52dbcc2bc72f4d758. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DEZC62319057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb566f878c71ad81452efa8b3c6e60a4d39db07be67121b1fb7d372ce08f9cad3. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USANG2283019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa95d229d6a0040ab3816cbac7c4eb13f05d7ad3a6260448360cf96f8f6abe441. 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/USANG2283028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431e0e9e3ea3e03dfae8741fe4eaee6dd8cec1721277c9b0216eac4ff254bce2. 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/USANG2237614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c806407ce5c417138498c0c7be23789d69694860bf4240d12b393b2b82f8c12. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:21:10Z), 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/DEZC62360448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb34a8af5a99a158b50597ba5a74aa51a037050bf29958eafbbaa730dea02300. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QM3DF2276542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f32692244d8e241832795bcb2db1fba0d3c8debd0d929904ad2f04f3e0dff4f. 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/QM3DF2296084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ba71c4dfbffaf52486bbab3f4cf8a25c21e78a37d9bd377ce6f8e5ed563bdc. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DEZC62373947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b73b5e6ee4ae9d219b131eb51c44c979ec1c2b238b292035fa6974012c2eef. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US3DF2476536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c902beec8ee0708b7ea61322564b121a0bbaaea823d5b86a92965b9dcae321. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USANG2421183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a99d391b2accd0ab4234d7f9145fb24dbab92a1ae256c025d24d2755df8fd80. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM3DF2410374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5196ce16b9db2c4c68082bceb8973d79883985c6f99b02cd3445221c077e6ad. 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/QM3DF2296715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x351570b7687d6c535352b522ca3a9d1516dccce37bd07187138f7fd11b15d43c. 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/USANG2268529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be1eaae1a831ce29d951cc13f228ffcfb5ed139532e8a8d7f1365f969f93929. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US3DF2516305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a544e4b9cd156551d47aa278f9ae3ae91166208993951143d6cf11d135c41b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USANG2478092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24fe6da70f2486142b741b43cdf42a51baf75aa3fffb25bca422b4887a5cb08c. 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/DGA052490544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba9bc037055d8cbf1f5c9f9536059acb74bf50ecc33cdca0bd15ac95de5a7f7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US3DF2435576.