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 0x0760ff2b09a96222c1a3f615af90193e54f4ab681e691d5b00b1b8edf94b876a. 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/a3a97ba0-dfbb-487b-8544-d98d90d6f2d0.json and https://artists.proofprofile.net/proofs/artist/a3a97ba0-dfbb-487b-8544-d98d90d6f2d0.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 0x033a7090eb7d9d055704e896b6444e32ffe46eae116faf710dadef7f4830dc4f. 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/CA5KR0008200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x085872899f6cb1f1475a922cf37a02d3c5557642911be7df631c880f4955ec8c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZAKB2172616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770ab74af06ced6acee842068e5b63d695e96caaa87532d800cdfee52e9282bf. 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/QZAKB2345936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c3b238df2fcb77865b39219b9789490d7e7dbdc917203a5ea90270453af2245. 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/CA5KR2364709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f77ee26ed3f9fd390c718b5d87005b21f408a0a0fcdf90524237b4e554ebb4. 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/CA5KR2352048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c3b238df2fcb77865b39219b9789490d7e7dbdc917203a5ea90270453af2245. 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/CA5KR2364709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1b4d4560264bdffe88f255d5a7b9b7f8704464c1a408a1cd3a09a3f5c60566. 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/CA5KR2410515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f24fde43a0ee4aeff173acb8908e1b610c75c55fc873f2d222a1a8cb6243a78. 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/QZTB42369350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75b9758c8c14020810d23ab2ca910728a5bbf5d07bde5b580a249453efa4e50. 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/QZTB42369351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2998b93409f7236c6ae3a03baa07c1cb5779976310a4519e28f27f5dce829ad4. 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/QZTB42369352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46287bb2208619c042964d5ed87f25696fc8bf551adf70803980121f2d3b42be. 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/QZTB42369354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d828281a3e4b029a1c07f6767d9de9bf727a4232bb8c70bc915e4f18b2ce12. 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/QZHNA2390737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bdec9fca9100e33092ae2864b3d5b04fcf31770177b7b31d70d657cdb1d7d21. 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/QZTB42369355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285c9569aa51524a18cf798fc70981ec00f7cf0535efa7d00e012caf565bd9ac. 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/QZTB42369356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03bac97447d2ee700858d091333d68ea00b57e9b61b0548e938e633f62dd071e. 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/QZTB42369357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f77ee26ed3f9fd390c718b5d87005b21f408a0a0fcdf90524237b4e554ebb4. 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/CA5KR2352048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d828281a3e4b029a1c07f6767d9de9bf727a4232bb8c70bc915e4f18b2ce12. 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/QZHNA2390737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0077decf4395cda50a0d03f7d4ef073e8f388e2e44bd57af9489dc0975c44e96. 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/CA5KR2215279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa7cede2bc7cb5d17d96e7dd4fb5066faed8664e0e932da90ed89b246d55454. 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/CA5KR2192745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3a30f1268742a137103e1f22c6362a79174c3583001c88bfe001946b52e4be. 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/CA5KR2310527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa7cede2bc7cb5d17d96e7dd4fb5066faed8664e0e932da90ed89b246d55454. 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/CA5KR2192745.