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 0x6d89665b4fd3a1b914c86d7896241be842003b149c5cb15528cb32967a698850. 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/62b43649-f736-44f1-91cd-eed28b0fca94.json and https://artists.proofprofile.net/proofs/artist/62b43649-f736-44f1-91cd-eed28b0fca94.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 0x8bce239335383fa20163b65daa19474d6fe148881aeee5bd5a363e4455c1f68b. 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/BRBRX2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bee4facb936b251d3105585b0f2230e1e6d3e8d5a6b0f905a92730a1028ea30. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/BR5HE2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933808da2a6c8c2b66d9462bf97569279512f1353afd141f17e9a7cbf7d504f4. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/BR5HE2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a99ff8a9199e89b4a026712c33cd13aca05c7222f6f7521ab65b6bc0806118a. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/BR5HE2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a883698e20d8ff8011dc0570e2221b28cdfb48bf9724bd2bb3ccbc847bde1c. 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/BRBRX2100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c4abda49e004b411b69845cadb7f92b8b401c3aa9f8580acc7cc2a9086844b. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/BR5HE2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541a29caaa8139aa35ccc9c4e0ff764e20c14ce096b3a812d09271bccac202ba. 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/BR5HE2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63961ebe00c83f41fb58670a6f3b1acedc5ada056117fc9bf77624c35d974808. 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/QZNJV2396425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8db0210bd559c0a940026a32b6450123b43468665fef021dad29e1e273402ed3. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/BR5HE2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f6a339038dcd4ced9ec7f074b5684f03db630551e8e288b6cacc54bcc28894. 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/BRBRX2400047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10dc1cc801d5ca2022401ee673b7093da282b1e4b3e09b3400eaf4fc14f09935. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BREMI1200228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x097340d522cee84314a46f0e9661985bb07bdbba4b5dcd5e9e6d39dd4ed0ee7c. 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/USLZJ2111767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc43ecd87a0b68c589a1e4c07d806eb21d6f4d4a613a6ae8882ece518b7f3d0. 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/BRUM71401513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0659685212d9ac3ce26d75c582c33b47d14815988c679b81251a911a996013d5. 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/BXBRU1800137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4bda357deabe0699f535bb39091473248688a983ff51669dfcfd49a57fbd194. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/BRD1E2000119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4be50cbd8d42a50c0bff8dcf08237e50d70371b44f0ba7b72818fdc5aa54c82. 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/BXC7X2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d621663311cdcb48045c992c9a93e03efdc9e62245292f6d524c8f43b1c9df5. 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/BRDEP1700101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf49d2d2a7e465f80eb24b711954db23dd6a5740e0f77ce473372d1bf38f504. 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/BRSME1800824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c4ca4d568397a9c254a8fa762d10425081d21c68e20ad3aa5b7351e2ad7501. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/US7VG1472429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887898637b22eb05eede2558ef2e0522d8117f69bd091b74d5d99743c44aca6d. 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/BRT0O1400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f1a3b3b5180709abdeb72728f93d53cf042abf7e4aa41f94fd9dcb0853a2ab4. 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/BRT0O1200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2adb1023d66e0145091feec83e1b56aef94da1333f88b36849e83fb91106f784. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/BRT0O1400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3e869d990f7ba42b9d976e00700faae3fb72f29f1ab03565ab35431ef4b2a1. 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/BRT0O1400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7aba0dfee67765af0c5d8487b1f7821d76c101887ff573ed7e923290caa31ee. 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/BXFAS2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8be922a6dffd61eda324b3445ceb9f764b1d25c45e7859764769f573884454ca. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/BRT0O1200024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04aefe5e9d64e85cd7037d7b4e012a9585dd54c37e30122a642d13dab22154db. 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/BRHPH2300005.