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 0x83bf6cf9508bd5ea090737349a78aa8d6c03a146773ecbc1efa3695d653d832d. 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/f78b7ac5-4e77-4e6c-9038-6fb28ef67fef.json and https://artists.proofprofile.net/proofs/artist/f78b7ac5-4e77-4e6c-9038-6fb28ef67fef.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 0xe85bb98b99efd223341d5a667ff4a7b331cbdbbe7dfbfd6b1c07a9b42311a1ad. 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/QZRP52229846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e54ec07eb0b33a5098ce8ea3d300af77005752b775090100be373e93eda23a0. 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/QZHN52280468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac6bac759884739ad4e0ed353e5a653554bb177c8fe557c83318cdc30ec51370. 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/QZMEN2264122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x236e49bf17a57877c5b2519bac8f5ca503846b9dee59977c57b1cd5c1bff1ce8. 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/QZRP52286186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c8829520a295bba878346e56afb0406a2b99ae2bdffea8bc88dd62c31c5eaa. 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/QZK6Q2234753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238c961573ef2e31d8c8d9d5eddba73f3fb7e6ad409616e57683c80eb51dd0a3. 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/QZRP52286187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f8a6ff3f762fa38286a0ae95628a7c54005dd03f95ebd42617cacde9a23e41. 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/QZK6L2292815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd799e485caa19db79e4057fae33245e7e41eef3626fd3d5c7e03e49f51cbbc. 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/QZRP52286188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe471d4f39b3396ef5625036101077115e5fe4ba9fdaa917dae69ebddcc48c49f. 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/QZRP52286189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87a4b74de48ff60ed39f11504ee71589a30ecb2616bdad75f7028d68fdfd7a4. 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/QZK6L2292816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6b891c6ab17dfa693e402e3a46999d590fcfbb37949a8319f10fcdfa47231a. 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/QZHNA2437226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef28a4c0fb67f3ffec2a6a0d361570583e8b7fd04f043dcb29e12ca750e33fb8. 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/QZHNA2437227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705f933d8a542012dcc0e2d6dfa6a57f12d244e948f7e76c178ea31646d25529. 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/QZHN42485315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x262e635fa4c2d1731584c3b74a11b1126751774c8eb93c10de48da6358e1c4f2. 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/QZHNA2437228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb701b0daff348dabe6395fa1ac7157856b5db2ff05c2dfc27ed481b3a9797335. 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/QZHNA2437229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705f933d8a542012dcc0e2d6dfa6a57f12d244e948f7e76c178ea31646d25529. 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/QZHN42485315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f62b6889abcfc387cbb5467996b14a2987c90e1a515eaca1d0f2cf9f331b02e. 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/QZDA52471496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61a89adb8d98814d6196e591ee086ca4dfd722cf19ba409723b94d32e42de2c. 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/QZWFR2399519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe499bff0c31be0f0d56675523869cdf06151e459ddb6dfcd5fcc2b6fe2c243a. 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/QZWFM2366599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4769501beb0198aea7aea5c4994e30600b2f0d962147435a5000259e37f67a. 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/QMFMF2375673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee2f7ecb5a1f498a491cc454a0db56aed9b7711faf89055a32daca4524b4ce7. 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/QZTB22364781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b590c35c00e9ce87d261f59a1968b98f1f8c8f4c32fd3e087d6707686e84e75. 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/QZHNA2302288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c2875c704ff60c0d3f9a821eba0f1908a6d89d6564bbd07298445beae83cf3. 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/QZHNA2302289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4295c9296e7a1956080d927edfc3c5a0aa010ae3a1b83a087048ac3d3c3aacdb. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZHNA2302290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23232ead1eea4c25afcb5c2e007375a0e3949915a50ada790e495132cb706a57. 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/QZHNA2302291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d67de25bf43440791661719432521f5f0d0847c37cb02bebfa92272a19ad5e. 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/QZFZ72329738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d67de25bf43440791661719432521f5f0d0847c37cb02bebfa92272a19ad5e. 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/QZFZ72329738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe85bb98b99efd223341d5a667ff4a7b331cbdbbe7dfbfd6b1c07a9b42311a1ad. 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/QZRP52229846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac6bac759884739ad4e0ed353e5a653554bb177c8fe557c83318cdc30ec51370. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZMEN2264122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e54ec07eb0b33a5098ce8ea3d300af77005752b775090100be373e93eda23a0. 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/QZHN52280468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c8829520a295bba878346e56afb0406a2b99ae2bdffea8bc88dd62c31c5eaa. 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/QZK6Q2234753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f8a6ff3f762fa38286a0ae95628a7c54005dd03f95ebd42617cacde9a23e41. 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/QZK6L2292815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87a4b74de48ff60ed39f11504ee71589a30ecb2616bdad75f7028d68fdfd7a4. 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/QZK6L2292816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c8829520a295bba878346e56afb0406a2b99ae2bdffea8bc88dd62c31c5eaa. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZK6Q2234753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e54ec07eb0b33a5098ce8ea3d300af77005752b775090100be373e93eda23a0. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZHN52280468.