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 0x7cf899182ed9ea923247d847bafb93de9c9af882f4f5de628afe42ac91b49aae. 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/6f154665-8cef-4f14-b7a7-772eb13ccfae.json and https://artists.proofprofile.net/proofs/artist/6f154665-8cef-4f14-b7a7-772eb13ccfae.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 0x17d63d8d5401587cdc653381dc80d61faa9b6f75ed04e620021721c8c1eed59c. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZTAT2145248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57bb512b493e133a0854a0f2e224647889ef001dc69fdc257b6815f4f5fef8ab. 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/QZTAU2369250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57bb512b493e133a0854a0f2e224647889ef001dc69fdc257b6815f4f5fef8ab. 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/QZTAU2369250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e3f9f82dce109e934e3fd71609556f776082927c1da5eab7535f351fe4517e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/ROGRA2101473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b865bb88de4f7f91e915325988632348d14ca43f26d10fabc587f6436e3bae2. 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/TCAEL1967447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98bf5bbde7d521db27b7cb8667b613ac1dcd8a16c0537d57f06363770ff46c5. 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/QZWFQ2329997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf66cf952d31514e7c1ab787f5a13fc2ee4b8981367dba80c5362a1836d3970. 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/QZK6N2339461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2191a77a5c0873afa2ae7ad46168ffa686813db08b712e6e9df228e7bf26ebb. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZK6N2339462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a8cef2a49c846e9730ec211f099f1b7fffa5580dfd5e71006b30fb2036a639. 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/QZK6N2339463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f290fa948ea1c854d6cf0b45090d8058b7eacc165869d0e728e63db6e8493af. 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/QZK6N2339464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af6af2f7cf16cee09707fc43722d8838b87fa5a86f90bc18d03e3111e641be3. 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/QZK6N2339465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab69ae28478b555ed3d075ca561b2652e77aceaea796fc9d65a3c96276d78c91. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZK6N2339466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ced8c93b2f38ae35e7511214c835ed57f6559f3231e3c8a9d7a1572f55c2a3f. 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/QZK6N2339467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4564e87da3d832c10378353119ce29d87617ac3244e096dd46ce07bb657c7a8. 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/QZK6N2339468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69207b5e413d4b188d0ecb7d580566680f87162a18b786185310576b9710bd92. 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/QZK6N2339469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7693551f92a556dd316e670eda69a5886a8d9bdcb9a66a05cbbd81bde981fea6. 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/QZK6N2339470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e4b40960c088f84aee6a7e17364b5543e96f40c5892bee7342c36f7cd4080fa. 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/QZK6N2339471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23c21984c029caa82bcaa0a2f65e52f9fe9c5d9b9cc0987865abc9a10e52501. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/ROGRA2101509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797c3419794d012223f6c5b139fe902891a4a3f1339220e6bd15a317cc45ef3e. 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/ROGRA2001389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619e11faf2809ae7a7ad3d62d92b748a027ee3b83ee3639c79e06dcfdb5f0b7d. 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/ROGRA2101511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8868195bf84093c15df010986781650ca62a28aec4a932e772ea2b029fef441a. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/ROGRA2101512.