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 0xcdc6e2673c7086aafe098ece870341bc4e9f7fcaa92fe59986c751db53545866. Chain 2 (Bitcoin): anchored in block 953773 (2026-06-15T10:40:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cab51d39-6059-40a8-8bd8-21e0fa2b7f31.json and https://artists.proofprofile.net/proofs/artist/cab51d39-6059-40a8-8bd8-21e0fa2b7f31.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 0xdb5ffe071777e90d25763c378a15233f1ea90d9fe5d0701b38218adb50b7dbbb. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZHN62276401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a87741401780a41ecc75337a9a7f8896431d8a78aa176247d25f738db5d8a90. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZHN72221937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfedc13ea06bd1e92e7ed75111fe99d430973efe7981a062182482c50b7a393ac. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZHN72225844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d28e7f3b24e238ba8b25a204d11db72db390b5a2f46dc99d9d7e97fa938b126. 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/QZHN72220617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf75b55d625219432d9f0b3d97b74d780c7a8be50d7d689e47d5353cb0352a56. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZHN72286309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5a807b95e10ec4f5eb8a75c611dee0094c773771bc1ac5dbc00264d77a398d. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZHN82253436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2aeba49ac9e7352ffa5e68271fb84136358c84bf79414f1b4180f0e821c9c4. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZHN82253631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb303d0722fbefc01ef2ab19360af138ea3273ff035928a10cb5a8982a3101fd. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZHN92235614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1189c12adddc49ff0e83c831fa683ba162f8573fe9d8b4fc3e199cd49d5bb93e. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZHNC2220557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49654069628a7bae00cef60ce82be67a2e97fc9f9d7d8a9f41c5b645d6867bce. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZK6Q2251576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b84624fe8b214a7307571d2a8e12707ed1b25900a2e25f98a46a58922c7170. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZK6N2239434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee4db6c799a48b8a7bae270c280556ed54aa4d46ce3e88a1218a283b4617e6f. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZK6M2219539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec2174c0c6cffde864feb7e46866630c031851202713188e0bc0aab950ae64c1. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZK6L2284022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf658c5870259e43ad920531ed93ea341ade16049ca1d24295167b7594078cd. 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/QZK6L2298187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ff6ae0bb4c7cb4dd542df219573db03584a6e0bf5f99e2fbc6072ff10b4315. 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/QZK6G2240020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7410df3f0ebc7ea5ab88059d6b429eb8a2e2a2f1a37baecaace20c770d2f279. 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/QZMEP2288367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71d32b2ccb24e08c0939399be9b24e7d74fae9e42608d042c32cbdd5877d632. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZNWT2247346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f2ae349a7ef8bf44136eab78562cdd595f8e09bd9d4f3ba176632ead9d2697. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/QZWFH2304834.