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 0xd1f5db37c2646f92767087501f4ec2103df1ef1ede2f7a10f39c779d2cfdb122. 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/2fbb084a-cbea-42ef-a2b0-970a7516266c.json and https://artists.proofprofile.net/proofs/artist/2fbb084a-cbea-42ef-a2b0-970a7516266c.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 0x9cac41c59212f2a38c2c090bfe90aabcad4d2b42dc4acaa074474ec9e5ef7718. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T08:20:09Z), 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/QZWFF2352860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579a6661490f73a4a787be03febb998d601aedcb5255cc3931d2bc427b251b1f. Chain 2 (Bitcoin): anchored in block 957603 (2026-07-11T20:26:17Z), 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/QZWFF2352861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a03320e94bd2266960200be45dceb75fe4077081beab4555c94a3c9d44c1df0. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZDA52436263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a7f1ceb813513468037ba346f287f082d03152264ddccff36fc74f91aec312. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZES92450579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02838c79296e2190438ad7fe01ec5ece5284341e28415277519badf488657dd1. 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/QZHN52464556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410a20d842d4e8fc72e811155d0782143ac793f7c6ef5774b265086c2b570a15. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZK6J2452497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7652bff11c9205cee51e538b1370d5bc1c14c242fa8516c4907e048b194e3e34. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZK6H2488332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ecd1f645e1d21e222dcc0e6fe208208002a6b37b39f127a4885844f7f67059. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZNWQ2481923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a4e8e0bf3f10206b174b2e54f11b1fda1dd377b64645b91a003353c0b4304e. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T18:54:20Z), 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/USLD91764458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600f5a8853a795d561bd086a6008e25bf558e8b880e3aacc7edd6ab89e0d63db. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T14:52:34Z), 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/USLD91766443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d67f4f89dc42c4de9f56a6f530de3fce3ac0a7fb64a4210e47a7db2625ccd75. 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/USLD91766444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d68c5ff086cd1335945093efdbfaa5abc109e45e59fac30a5e0bdedefff6c60. 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/USLD91766445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb69ebcaaa03b8b8208a82f374336d7b038daf7115dc1f71a1b361c05a3e001. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USLD91766446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05381f85526a30e2544f4f30fe2dd0d03ae02b3a381ec21fe92f22da0aaba5e9. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/USLD91775421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01956fe10b1665df006b26352fcc7fe822f90204287a104c00cfcbca826426e. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USLD91775426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf669500402bbf71dd987ca657ac7bd21ed5d0f04e836e54fce6a74be50b8cbf6. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:35:07Z), 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/QZTAT2550474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa4f7fee7dd5082bf1824e65645f2e84bd0442cfbf068d21644e04ad504ea96. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTB22545247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24872e51b9b15498fd2d5cdc3817aa45648c164199a03de479d206a7bfb84a30. 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/QZTB82537598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c88fd27ff94173ff50baba6b05dd1b6837c40ff570c3be16a4b8bae8496794. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZTB82537599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca1067ea9e2a6e53679a3fe79ed8bcd8af8ae255f9f521e8ffd8b77e1a2428e3. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZTB82537601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa4f7fee7dd5082bf1824e65645f2e84bd0442cfbf068d21644e04ad504ea96. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZTB22545247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a6afa23c2e447b0db8fa02ed11e554a342575a14b1de38c8cfd201d1baf9d56. 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/QZTBB2542751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f928bd380d0b28a57a067df87b358437c2352ccec899198c629e8844b82828. 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/QZWFJ2510476.