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 0xe271b25c8a5bf43e577b899f1d026a8dbe076dde21e7ec8ada3a68e700f9c1c9. 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/f55a9160-f2c8-4e40-a83d-e2eb7330fb4b.json and https://artists.proofprofile.net/proofs/artist/f55a9160-f2c8-4e40-a83d-e2eb7330fb4b.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 0xa3fbd0001e08f4545a766c08ab1c9f9e04b96c148b32b7fe38791629441b7a02. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCAFZ2239976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56512e0556c0e06d935fe46432143ae7e81673a083feaaddfe944f62ed8e7960. 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/TCAGG2232112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a32e20f144230df5b952c71ce97141f216d6e381c5505aed88ef7e37d6e83b. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/TCAGH2216945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66829fcbbe72e145d95f1f846cf84bf026de8cd797ce4105c620b6f38e810c73. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCAGH2292379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924881768341db7cec7765b64d02f68695c9820a214b6f38834894b767b46be3. Chain 2 (Bitcoin): anchored in block 957591 (2026-07-11T17:21:30Z), 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/TCAGL2265631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc749b53f2cd28bcbb079d2e63d9a896c0d1771f878e17e62a75790a69fb0b020. 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/TCAGZ2324164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974de338c42b95e993e7e86895ca6792e00e4145b0ffa8c3e2f9d0934006079c. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/TCAHD2348318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c6f192d588720b1bc8e8ec1d34cb6eba95e474e2e21904174bf12a218b6613. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/TCAHK2357414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x388c82f58b7aa1a07d8d3937b074e13a7ec0d28e7caec3d484cc9d783ba5608e. 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/TCAHM2310546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86bc21558a871f08e56971c14b77d0eab8af5aee202df9326120b5e778419964. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/TCAIF2498521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x066c704fcaf023123efe83792ee4ae88c89dd38971133c89d746521b5dde3367. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/TCAIF2498573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a324e21705c57f5fb358231b0d6b1d6206610f7e6953a96a9e065f471f59bc. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAIF2498645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecb9a2bce6810392a1d3c5318947793ffc93b4dc7adf652a1aeb7c8dcd787825. 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/TCAIF2498680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98a175dbb5d86e1d5264ad8ca6cffe5d4434cd5ee4f631bc34ba1ede7c1c2e3. 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/TCAIF2498761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e66e0620d4d8b00e688c07623515561482cf5cfc32e1ca1e6ee35ab977d1063. 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/TCAIF2498839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07149f4cf28abe1dfb994247025c680e73d5ba74285f8d256cb973c233281b93. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAIG2498923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x206e8e66d3470231a93332eda904f33f55acb53178bb3b327096047f362bc81f. 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/TCAIF2498949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5599d10809f37621ccf267cb3430051a816ee662b328cfc7b382a7ca3c23c7b. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/TCAIF2499013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02edf53c1ff7071ee07599934b4377377b2d7ecb60d978ae4d9713edc50ea690. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/TCAIF2499072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd31b4548ce7361d5d37e78819fbf2ad0b43ddd21e9011bf777caa45e37db06a. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/TCAIG2499094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b59b69e6332eb46162b5ff09866c0d219d827e811f77d732bf6d279caf3c85. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/TCAIF2499148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de2d3d69c93c51a15e4592bd7ff2b858da54fab7815b98e45136b45b0be731e. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TCAJA2476240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf835f3b0e9c29452875981e3b4c1c818860fd393fa68f3aaaa285df32207c12. 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/TCAJO2550181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374edb61f929670652ed056930e5b03e0e9418af2b15989bab6490e1436525ff. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/TCAJU2555229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a297d9ce12b88c9a9c2b2fb91f7037ade32f20102c084355d950d54ec6820de. 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/TCAJU2555260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ee30f929d401ae6992c1be2b68d200e1e8a49aab4d20258320eab48084eec3. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/TCAJV2555265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9724223a98c56d7bdd7b1428d70ec1722adb38269f00b76880fc2690cba907d8. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAJU2555281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedfb3d48f449fac869f6190d62ae35bef18df97c31a87e61e06e4e2ee7c98c9. 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/TCAJU2555287.