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 0x97737c273304b37e38532507e1bac1d2dd1384731bd5d0b65f6296f6b70c4d80. 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/62ec6a7f-662d-4f68-9b8f-e7ba46d5a892.json and https://artists.proofprofile.net/proofs/artist/62ec6a7f-662d-4f68-9b8f-e7ba46d5a892.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 0xfd6ccaf1774ef178527ae6bec28807216c3a4245b7b4d7cd9cf4a017142c21d5. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/USDY41591312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bb85ac846bf20591a2bb04bec3c0c9950b417ee9909d482afa3abb3bf77480a. 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/USCGJ2062160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d6e9cd71a3a0a20ac59701c6da3fd173a1380fce5bdef92c8bf1024cc02cfa. 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/QM9A91819125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a710d7c12f5d04a0f0682f6a4344d2d0de20984bdaef26510bd35afb68ba3d. 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/QMAAK2004032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c6115004e10933f16da1bd828d25b6a193b3fed785d37cd85804e73c53b1b6. 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/USCGJ2062161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e49a5ca7a5486f2f25363a1030e7a72b882dc24ca02e3f537e2fe3ea1fbd68c. 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/USCGJ2062162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a1280f9a7cb75beaa67b1f163adecb1ca5e94bc4daf3623523eb080bf51d8ed. 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/USCGJ2062163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f34e2d98fba9dec41211a984ec5d3238bca040f382626fa94626cdea662e15f. 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/USCGJ2062164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bd0aa5c4c5ce596fdb2abeb03f3bdcf4b8da5ba38a049c9231297ff4f293d2. 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/USCGJ2062165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8188d4f43d8dcb9373a3624b94f4bfebabc2e076be5e128affb3bf6fc11608. 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/USCGJ2062166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60402ec24a6a1cc46bb269f959f2198e9a5995f7601cfa21beac2bcc1830545a. 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/USCGJ2062167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca32e6e699d90513e2f1eb2b8b8f328c699caee72ebed33c7eaab67fc8b1490. 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/USCGJ2321896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897320b504db23194d290aea89a264cd06fce8c780908818e32b731b394feae1. 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/USCGJ2291993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd6d0f96791a96cb75fb912467e0bcfa236cc879cdada0ba12c5b44ed7123af. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USCGJ2321898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c3ba01def5a1ca0c12df0c82fab6c7523bb1f6a4e25a9a51b26e3bfd22fbcc. 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/USCGJ2321899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939dac7a5b95083156cc6557652dfb2576cdd541115154538ce772fca5901c19. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/USCGJ2321900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667652c371c4c0ea443c95f77c6a28dbb1cfa84cf307df41b0b917dbbf4480c4. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USCGJ2321901.