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 0x8b3062afe64c6f44d00ca63407d2816107dc48171c02bc79740636636dd1afaf. 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/6718e277-28c7-4f5e-a093-0e5c472260ad.json and https://artists.proofprofile.net/proofs/artist/6718e277-28c7-4f5e-a093-0e5c472260ad.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xdc0e21c6dc9686345a5a92ff29668eda73ea08e8ecc8484154b92d6b56f5faf7. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/USULC2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49bbeb491accc73a54f41bf99595f63d22ae09045e7e14d2d8c970cef44647d3. 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/USULC2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633359e48f648a3735799c10594fd2a410f0a33a3490ac00d04ce8c3967bc7b3. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/USULC2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fc0faf16f480dea3840dc21fac84437d2071bb4e2996b0f08a2c7919b27ba87. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USULC2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c04b9803cd0d7465200fe6e7056d850b873fb588a839f0dc64e4bc8cb93f710. 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/USULC2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0f3bd535e111aeed1338e99d784b7e2f53019d0239cbcaac232f88c10425efe. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/USULC2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a2c7b35bbb4c29157cf3b627049d5d0de0dd3c79977839355034d64df6d99bc. 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/USULC2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdccc2d42154625bd83234b699c6c481fa7c170b62561dba205a90b7f6b110dff. 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/USULC2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77c963bdbd7dbc318032a89492d3441b63396194f6d8184a7e6a8f7fa3f7184c. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/USANG2407877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdbba9f6322d8cd5405cc9ac544a92ca28cd8589b08a7617aebefe3bca7412b2. 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/USULC2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a2c7b35bbb4c29157cf3b627049d5d0de0dd3c79977839355034d64df6d99bc. 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/USULC2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdbba9f6322d8cd5405cc9ac544a92ca28cd8589b08a7617aebefe3bca7412b2. 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/USULC2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7b579214cda5d53c82fcd207b764058178d666f82ecb84e3d10455104108a6. 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/USULC2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdccc2d42154625bd83234b699c6c481fa7c170b62561dba205a90b7f6b110dff. 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/USULC2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025aa39f7a2220aa0320715cce4fc836459bcaf4d261912bdf51d8c0ccd8390d. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/USULC2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878bbdea7dbdf5e850ca995931648e505e88ec46ecc7b6540b9eec6938e85563. 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/USULC2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca35cf631b0c4681b3d28d4ee447e3b35ac81806bea4001df44e70eeee1cad9. 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/USULC2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e03e3ffa84aedffacbe825f4dc942b65344ccc2c8143f586ed4c837274abf1. 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/USULC2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6566ac720c69933d06d1a65e8edd7bda3b1b3abe4f05bfc3a040c4ea24b4e9cc. 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/USULC2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb054fd8029a495f932e091c2df2bb8bb4979a48c46b0ac9ec91d6a161f166357. 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/USULC2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe299654aa2fa916a7993e7f1f0a542d29dc7d6b494979912a4810505ba10dae0. 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/USULC2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe906e65406bac52485a854eb968330f5461d50c665fa5337ae67ad1c46385dbe. 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/USULC2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8808be1c7b099e248a0ee1c8d8ebb15cc611587a33b90ed06f82dd4e568575. 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/USULC2500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20f80ee13c147fe8e9386c6a402e339d7a83cbac0ae973a7f7ff57716f4d7867. 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/USULC2500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6031fe78326fe9fa7e58d4f7e9151a74d0341e36650f147037c212d411192eb9. 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/USULC2500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75dc5efa8ee742cf53995f395b2dc0b7fe9d41fa4537a75dfdce8a177fdaa365. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USULC2500020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a80d266fa536552770ee26afbf64f7a9fb00f72a6b2b0dc520e4d0347427844. 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/USULC2500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f88027754303710b77e55c3ae80b09e6ba86eea54ee17dbd8c87e25ee188637. 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/USULC2500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d62c3c7d6eb58c3cdea9f6e43b187c796735b23e5edd149fa7ead03025b20d2. 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/USULC2500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75dc5efa8ee742cf53995f395b2dc0b7fe9d41fa4537a75dfdce8a177fdaa365. 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/USULC2500020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af915c70ee680680955b29db6add8bc1b111d9b1318e6ca786ebaf692e1684e. 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/USULC2500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b24c8d1355814349dfdb295ce3c7ac7875f83f9b2972bbf75a0cfd1e386e2d. 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/USULC2500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12b010d5222c67a1d38e2a7a371c73634b2adeeb915b4fa3d93c0389d64ea39. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USULC2500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x155a3b72850593cfcf196015fbd02f7d91ad74c92f901d599d04f37989e25a85. 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/USULC2500018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7062bacd176ec7429ca36def431c76c417922af423bab05bb00828a195fa53. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/USULC2500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a4249e3eb0c8b6197ef1603dfa575a91714fe1ce791d55a8d9a0120b7b66529. 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/USM441000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab032b0a9e6100463fd84a5b38e6b4bfdd04ac8ed89602e09071decc3687c1b. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USULC1400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3849234837dc96a99f0c1975cb8e38364bb44bbef385f584d04fe18ab3c1981. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USULC1000009.