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 0x94d91a355814f55ff4c7e473563e2c6df565125b4543b7fd3ba697dab9b4b1ef. 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/c4da16d2-f5f7-4f68-b014-5a7dfaa57b86.json and https://artists.proofprofile.net/proofs/artist/c4da16d2-f5f7-4f68-b014-5a7dfaa57b86.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 0x264598ac0073a38020c4c6d3a30d809ce2998901a77ad170d9a35b6458406d57. 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/AUMEV2461069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0e07f6b23f6a29d9ffdea69f49c09d803627a0af44f5b58e198e30950ca86bc. 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/QZK6Q2453901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb89beafc7cb84f8fe9100f54516a057547d276fd81deffaf0fce2f28cfd8352. 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/QZK6Q2453903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c44cd696022d49c66d3c8bf77368ca23d9f2b5e27f7e6e537673932a1482f4. 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/AUMEV2411348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2782829ca39dc57522cbbd156fd6a23abea527a7b9dd9229a96862694aa07803. 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/AUMEV2411349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe87f5eea3aa883dfa3ff786d88ebc156c77fef57209ba8a8cc562e4bada44fa8. 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/AUMEV2411350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413a5a72f0e276ef7c78d32e112ea0135078d42231db22c3b119a6bbb5ed8cc0. 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/AUMEV2411351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x717fecb0505f477130f1427d299091b38aa1eea84739f40109e2ccb10914ced3. 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/AUMEV2411352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232a186a41937e1a386df184f42922052a01033d821b5f11fbd8fae1cf3bb4a1. 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/AUGBT2356751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa743273f66775c0cc64fb1baa6285a1c0d51accf6539c813078fe73d7b1dbbca. 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/AUGBT2356752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4104e899ddd73421c87de68f9630df41cbc475fac96fab1f631e8bde286eda9. 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/AUMEV2322565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db61b8c4b695084ee6f6ccee23eafd5894f419acd6ea26963dc00c579f61ab7. 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/AUMEV2322566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec2eb0a3b0fa3ecc9db99546d81ffb4a9f7d78c32cba7271771c8b009334673. 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/AUMEV2322567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81247824cc065dcdf8df987e58d013c1708bcbf88b600e34e91306912a575d88. 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/AUMEV2322568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30fc9ae4ea6d07a2b1e32877785a1c0853adf0b429a6304ea7e0adbc4cf5a72d. 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/AUMEV2238548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7716776aa24815ccaf623e6a10b16a9503b8a5edba7ee226dd9616a65de645. 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/AUMEV2322569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30fc9ae4ea6d07a2b1e32877785a1c0853adf0b429a6304ea7e0adbc4cf5a72d. 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/AUMEV2238548.