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 0x5e85e5094c9d7d89fc952993f55812eaab42bd5bba4e448e9ddd4439b5520379. 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/f5793a4c-acd1-4cf4-9883-a8c5172a8031.json and https://artists.proofprofile.net/proofs/artist/f5793a4c-acd1-4cf4-9883-a8c5172a8031.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 0xc436b993ca54aa13017bbd9c88eaec1cb1f8dd180f79171c9967b6cb99af57e9. 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/FR9W12014398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1842fc341c981fa25a738bc8f2c311015ee085e2143d75bb49b49bd02488799. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/FR9W12014403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872524db387d90c08ba05ee7c6d3204c2bab548fb8924a8af8401b8e905c6ce9. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/FRV082000017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb9b5e813e12cb9bd271bef1b67182c014f0231fdbcf8a98f7094ffff80b47ad. 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/FRV082000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe830aa18033d6eb99cf54d83cd7e5c67712eaa0dc34cf5190dfc5a14c7f4e19. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FRV082000022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf69289d86065a8bfac551bebd68e7681f04bb5f076b69a6b547ac95c4597ef23. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FRV082200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dc9d33bb2edba81997f9f5d5ee69b3860a9b137ad7ad2991969d8f198f6ee40. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FRV082200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5488cf662b3f34718f4676221c3128aceaf991adee818207db78d342f47bc16. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/FRV082200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7296b4e187eaa3bc755ca67ac313d0475d1446fe5c8844b534c5680145c46d3a. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/FRV082200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1853157f62aaaa42e45ff2cb54e2ff8cb541dda2cda359a89f66c9e162eabe22. 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/FRV082200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a3a0527b377776c24e77ba3b1b9e5fefb5c1f6decb0582d827aa977f54aa12e. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/TCAHL2349075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8886f22c244419ca331af00b5ad9528a4a8d40ff50f23ff84648d99829c5ba. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAHN2328896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf07881b68a2941747f27e4113249c43c739687c5645eb5ab40594cb618858d0e. 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/TCAHS2316532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x314ab12987bf57f03b4c032d4835516074018392cb9d2d09015c36f06ce06182. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/TCAII2458767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd03672fea1d25baf800d493b977d4e08e5ee191eb8b6a476ff3d8dbf3597724a. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/TCAIK2422805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283a4a883798cd0716b149d5b5f11c3cca247f450c9d0d5e39ee4d0436f8c46e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAIJ2453270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052fb5809ff61b22ef8eeb460f492d38973e34eee59e31f397ab9b77ccc3714c. 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/TCAIK2453375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe175d9031d8ce7216e3e25082a457dfed4e20f7b35c1759cf20b02894189467c. Chain 2 (Bitcoin): anchored in block 957554 (2026-07-11T10:39:45Z), 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/TCAIJ2453397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bb6f2c64f81917441e6a74a11fa1428d2ab50f2eb5d29dbc23da935b477a2b6. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAIJ2453481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591fea20cd51578c0ce4aa604d735de5efc007c13770df6b0b921b701627bfa7. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FRD0K2501200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7a673911481409a1787fb466ac6e924c5c0e5265b8abf8f1cf0008f35d9690. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FRD0K2501340.