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 0xf8d0f7a13cd03b2f2fd02e989cf2f593a113bba3530347a992c6f73129b8de81. 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/f269882c-eaaf-44a4-8e98-d5a6f6c36c76.json and https://artists.proofprofile.net/proofs/artist/f269882c-eaaf-44a4-8e98-d5a6f6c36c76.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 0xfc5330bfe316a0326bab4cef93f870b0404c8229a1329f763e68d24b9a9b06ca. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZFZ22037335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b7e62c0921439159b8ef33b0b1f3343bab905210be4f6fe33c406e43ede7ee3. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZFZ22037333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7f1a5a1f4bffc41aebde233e0c7de84d542191b5908e48e661012aa5185084. 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/QZFZ22037334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bfd353d89e2ba16c920326790459398a99baf9d6eb0158b853d32954523b7d. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/QZFZ22037339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744b1b5f627b4d1ed6f8964ae66d4fc5a14c50a5d6dd664709d5fb3b7a9b6b22. 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/QZFZ22037332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78eaa07693bae9dcd83aa2e823cc0af2361872fca542b003fded15de11b8821b. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZES62174271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7ccc6971bc8490525b7ac26b0a0df2ba1d2c5cb7e886977b59c317925d5083. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZFYZ2062940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf88fe7dca1e33177b4ee8b629cf52c5ad46b4108295fbd72d3f58b74d831b2. 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/QZFYZ2037325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5561e6f91db3d5c75f99913501c2b317455997025be01e53411f98bde270ff50. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZDA82050191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d95538450292962c56dbd26503520ac7550d9c41ce8466a40d06a42623d657. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QZFYZ2053935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54d5600f229ecc2171efc345755ca0993f786a337d32cda5bccf7cd1bc610c6. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZFZ72005974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6975fad5c04cef6ca37e44ba6f52eb17b4cfe8c104ddd419b3b65f41abb9b14. 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/QZDA42015676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe078e943624c3c4991048439a5feecd28d5f2f1980f8a5a6a74488a322cf7977. 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/QZFYZ2062447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae1810c21d42707787bfa5109ac1d43433857c1e873fdca7c85f8cd23620cec. 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/QZFYZ2062939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaecc8709446e60cdd894aeb93ad63fad592503d9e5a9684b734c213249e4cc02. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZFYZ2063335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x823e064bec67f951d1b77375fee3d13bc4036fd8008ba8eccc98e83a9cd38856. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZFYZ2063333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x354af936fb63b84ece4cfbe233f089eb2abe94dd896af4b3c593188203b22f09. 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/QZFYZ2062941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x390bd707509c843c4218e10976c894b5c866861f9d96c0d43e211285f63b8828. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZFYZ2062938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56e3f9197a632b50f94437a29fb4ce4751a2497f504532fa37cb8597d31188b. 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/QZFYZ2063336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ae0a8e7fc0f04ff8cf904f47f4fd7bea7a43cf0c11e0b4c9dfb241dfba0a0c. 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/QZFYZ2063334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4689745e748c01cb619dd82fce2bf63d9c2d7ba01dcb376499fe5263dfd5cf. 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/QZFYZ2037655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff1f7b35e7a6b5741ecbabfec6854426fbb5ae884d340b302a55fdfa8a7709f. 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/EGWKS2159601.