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 0xbfcb3511f8491d103aafcaa0cacc1774c9e57bc8fb7fc990d82fa4723fd95d4a. 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/0ab4ba73-244d-41b6-957b-4d71179bd05d.json and https://artists.proofprofile.net/proofs/artist/0ab4ba73-244d-41b6-957b-4d71179bd05d.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 0xfb5406a1741af7d8f3155fccdf6fd1714d9146890ced863f909f8dfc0c02aefc. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QM42K1708466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x451ad2c66e8cba18328d759a4c1583d9ffca9027931d1168e49872ff09d52b97. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM42K1708467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397b593f7671226e7c5d7fbc7e96662a63575646f29a3e4785df2b2551343b0a. 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/QZ8LD1718161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7260370c4043d49d3bd2872f8593cf519adef97132d0e9ae845043bec9a987. 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/QZAPG1895021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711a3371cfe9fe0a479176bc6f166691f81715b22d19358ceedec54f8af537c4. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/QZDA41801726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2367d5a0ab8f8db1fa45399be7be318826263071938638fb759d0347367e83f. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QM42K1945866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f9f8335d8561db5b360b93f78fa801f541b2f296c27e3153a175b32e64b77e0. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:09:37Z), 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/USAT22100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a9d0fe68ee6b6de72b4489cd3b1acfa7592d32a9da94532a792cc453b127fc. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T13:44:51Z), 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/CAN112100589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ca1555a96565b2d4fff0a54aead537d7a9eae3ee892e8707a2be069fa4d9752. 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/CAN112100591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c97e070b3e3ba22ca86941bf8df483a6cb514e0b6c029279cfb6cbe98e2efd. 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/NL1LE2102504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c0a72d2a8ea851ebb3b3913ced4bcad74ca3dbd245c198cc7444bbae96ba1a. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/US3DF2249190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464628647f3ce462a225a56314d67321bc22c3786b636f5dd9bcf00e73ed30f0. 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/NL1LE2202728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87eeeeccab27dceca0682d058c7cf57ed284e719a75336ced7abb57fe04d40bc. 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/NL1LE2303288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe860076ec63b86d253dfdbde31d6dd36ac76cd8ba35d25ca398f589ef52200. 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/SE5Q52500570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157ba4480b187bdb35b73122e8d239d707b13a1aed1aae8d4920764b489fc265. 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/SE5Q52501272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d2520325fe5ce7e3a61061f99de5e62b7bd8c13ca04572cfaab3ca8c827ab0. 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/GBKQU1916699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ca84a685a9ce7bcc0cf552c2a3773ae1e795e4f938478f6c7699db0fb98d0e. 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/QM24S1820720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f1045273e8332cb6a9963248ff52ed159de923903ab7474c2f28caa5186456. 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/TCAEN1970832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c97e070b3e3ba22ca86941bf8df483a6cb514e0b6c029279cfb6cbe98e2efd. 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/NL1LE2102504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f220b3a13f45af9f5f2bc493f8f8800298b620ba0cceae30bb2a39599f75f6. 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/US3DF2233186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed69fb4ef64e3e17f22c85dc52411ecaad9802e464ea978e2795d0205c2d2deb. 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/QZSYP2330544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d2520325fe5ce7e3a61061f99de5e62b7bd8c13ca04572cfaab3ca8c827ab0. 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/GBKQU1916699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90bfa174084fad47f58e4715be5932d501566ed05922cff280e4b918d33fa77. 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/NL1LE2000714.