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 0x0f1f94383b4976831b7703f1aa4227f6a2fdf9a1f1e20c8208307be8f3091048. 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/da0c2bf0-65cf-46f7-a148-74e3aa2a5479.json and https://artists.proofprofile.net/proofs/artist/da0c2bf0-65cf-46f7-a148-74e3aa2a5479.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 0x4b566c5eba3d763c1437a25237450fbf02b239c20dd258c01e3c57d7e9f3f9be. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZWFK2599342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87519fcd73b4ad5e847f4e77833c39405d2f9cebdd4ea8d22eafeb9db4c7f93a. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZWFK2599345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd318f8ea341a5cbc9a6995f0db9ef8690f821b75ba2fdfe79d23a135e44531f. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZWFK2599346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f62c28d584bd0949aa3da413a8c626db50706dc760110812867504873fd1884. 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/QZWFK2599348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8122a96a14984f9a3e230bb78ac869d116cae43991e45a9d68e53da82b707962. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZZ7M2501705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ab5a4205a7bf72652149300f01650c224df231f1371ac5badd7eb6e1346468. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7X2565412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa57e3d93eb1b6bf11be57403f31002b442c24909f2f28ee865c1244fcba1589d. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZZ7X2565415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cdffd6da111ea1709aa95caf1c37bec0d746e25de5e37051e833296e2a236af. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZZ7X2565416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213613f0fc35dd5ae17ba4eff07e3e19e4882eb42a28c5a7b49716bfce4d577c. 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/QT3F62536278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f4712e7a9c75473ded6e03c746ddda0317e7c682d8299b58adf31375f02dc4. 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/QT3F62536279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe457a7e64c74bfeec8fabf9ba931ecd2b44e58b80d29e683088491534b22660. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QT3F62536280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e98e033491de7d6fc7abd85ac5322d5ff57b4f90a9887436169ccf05a38761f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QT3F62536281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9896c67757fc542d2d5a1ad8fd27c853add15cde8b7c1bb3b817117f0896409b. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QT3F62536282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a8227816987f478761f710d3cef6608d8f095358d1ef67b963d6805814333f9. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QT3F62536283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbdf8d6b9615be1097a2e20ef2af0f061bec7660eb741e084573f0a33690f677. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QT3F62536286.