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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 0x8b5ad3f1802aeafbd8f8a1e5c2d603fd4c54a467119b17d4d1b7316daabce929. Chain 2 (Bitcoin): anchored in block 953871 (2026-06-16T01:46:03Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0733d039-ac33-4bd5-83c5-07ab20b45cae.json and https://artists.proofprofile.net/proofs/artist/0733d039-ac33-4bd5-83c5-07ab20b45cae.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 0xb09d64ac802fe3f1ea8803860ed2f23e611225fa6be9001efa6f04e332fa82ec. 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/QZES71989959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d0ddea5aaa2f3edf7a44734e18abf209779e223ec49f99e806e693c8dbb17a9. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/QZHN41930791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38602c3060841c7ee69a712f0d8ee513302569b73e15cbc2fb469159a4e33736. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZHN41930792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10349de6472b2d0e46040b2775d5faafc54814413e27344d101138344a963438. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZHN41930793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3477898635579dfd59e3068c20407e9b0aa3d133cebf3991e177c7d4125770. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZHN41930794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27bdb20d64df01004dba219e2f4af61dbe70af10f07230afe7577eb1a87b1525. 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/QZHN41930795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b795be26c53f96ab5af45dc198ce60a62a0ce482e2500f0dc6a75ee408ad960. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZHN41930796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d60e44434815f4f11e8146c23cf4c09586696d66dc0fa0a8dd8757ade2baa3. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZHN41930797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a28f26c79120087d85929521fab13b1310f6a1149c6b968b2dc032d7dcefc22. 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/QZHN41930798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cdbe6c695aea100b301fa3c98ccbc0c75ff26b2b7078ad216efcfde032e5bab. 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/QZHN41930799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc6251c8416280e34bae3164a8b523d8f8b93e0c2c0d78b79068c556c41f8231. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZHN41930800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa3b347a7b6c2d9fb1e7dda3fc144870ceb2f40ed6fd0162999c07afdbe013d. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZNWX2032746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x139613d241d70840c009e6ec6040399844958d2591d3c532ee1507ba0f5a5889. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZFZ31996642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd26fad7eb558f0de629c28134c9a5833f1be5b4e7163c472e07495bc43925a. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/QZFZ71990531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda3e1170c6bdebe65fc64a817203814ff84098d97054c0efb0ac3eba98c04607. 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/QZFZ61954508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f1c5dc25aecdf40b2b68d8e946ad806425698c025be4678fec087d05cb380d3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFZ61976146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6700a2079c21171a800b72d0aa3f8c493baaa491c0d987c5e11719de9286a8. 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/QZK6G2077142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e1706b1344682f0478cadb876b3e20d4fe4845fb688b0fcebe6a6ee0dfaf0c. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZK6G2077143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1300f6c9b164ce40512e40175d819449114dd99ea4400415bd6e7fa2da944840. 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/QZK6G2077145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2762b22f135bdb6e9c79e0baa530d8d4b9bfb95017c3f8d0808344cabde10809. 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/QZK6G2077147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb980e384a75d17b2628848cf7bda01dc77dfdcc727af33b64f0cdc28c9772a. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZK6G2077148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x068a85288c2e3d59598bf937bcb3b2e5c2d823dc61db7c199208fb96d36a43bc. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QZK6G2077149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fcab2fcb34416b5f8e94f871fae97d74aa606d6947212f5c2b42296a878497d. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZK6G2077150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80e59124b02e8956c5c16406b777b58e1999853fcb7fb0e1d0c386092d25dd2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZES62145444.