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 0x555385009fad7936a54c0238811d83ea78c0d07f092c8adb1cd49922073f4d98. 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/f132d972-664e-4377-b471-d57445e30e07.json and https://artists.proofprofile.net/proofs/artist/f132d972-664e-4377-b471-d57445e30e07.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 0xa4c03516671f9bd7450b776e8ac64b42b60859a3de4c037497e1d505e9d0a5d6. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/BCQAL2300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x245bc4be3c51fb8fbc3c5686fa1b4648d2d3768e26a41617c7f8fa9cab825dd8. 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/BCQAL2300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba04f2b4ad19c755ef3bef0b523e4ec62836e7aac93e3ee7d116642aca336d7. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/BCQAL2300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32c916e50b30f813b10a20b65aecb188f3bad148e9ec84d29cc935d070ea123. 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/BCQAL2300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48be6a730c2883b574c49e3b0e110f8cb5deca7c629f0f993132cfcc4d40c7e9. 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/BCQAL2300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca38a0de808e19e7e6fe70a66657353c293f3aa7637332a2668096fe24a02851. 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/BCQAL2300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x980e8b68e3589699ec0f034ef91b6263e2877f96fd8cc3b59d4b4148b8623485. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/BCQAL2300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13da656af88ebbfcbfea31a0cf5e82674a07891b65e15a7c9dca2959e55fb066. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/BCQAL2300025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd89c4bb2e4fe48ae27fbc6f0857659a85c6327610410a20b7321a0a9708ee3c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BCQAL2300026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dbfc3225c4b7817c58426e6fec60363ce3629966f0e403bbe499a5e76ec899d. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/BCQAL2300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc88b6e63a5fab363b029cc44ec26f7bde2b89bc959f677701beec26325db185. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/BCQAL2300052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff93cab7298b8c95dcb036f5f7a68316e1c0d15c494f2f9bf09f14e23af24495. 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/BCQAL2300053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801d800d7324e4b9861318a0952ab3a58a7f540de9fc6e3da5ceef0f4c603706. 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/BCQAL2300054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2a9f83f35e9c68cc15e280f981fb91f32c261c9abfce1eec56ab9ac92cde73. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/BCQAL2200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc206214a2cdb6a73afbd6ad30fa5f244e382c4be3f4de531ca671833c0ce2e28. 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/QZNJV2046750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92513b46220931e6b5420be603280a321e5c297484eed66235baa4ae8d41bf77. 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/BCQAL2400028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e91c90b611e20d6feb058044bf653ade9eaa21facb058279c2f735adf10e49a. 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/BCQAL2400029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a6e125ff3ed625144f8215c9e67d53f2f121f01c00030565336a4b3f1d67a2. 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/BCQAL2400030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb3943ec76f0e04c887c45403794df3ad7188ea12671340110f6e3d81371ad4. 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/BCQAL2400031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6ae73f8e9d02e04bd52e233d8ab32d1c7ef26b767872115c3d3927fa1ebbd0. 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/BCQAL2400032.