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 0x65d4f54baab195cb26d06140c58c68c352b37cd6717e06a6de491b997769c994. 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/f77f25ba-8570-49cd-9042-1920a948aa41.json and https://artists.proofprofile.net/proofs/artist/f77f25ba-8570-49cd-9042-1920a948aa41.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 0x4268bae2a064f31094b73733a10b0727abd9d56d7485a7c88340be63ac360add. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/USMRE0802701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41f98d9838cac90d1c3b322bd7a34c0f759dfa28724a40dc565e9e46312f9472. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/CAM460401513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7866996943051a6cc09afa6ab999132eb43fb9fa9ff74f3c1aa3b2036d29599. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T20:07:33Z), 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/CAM460400291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a8a88233f1878a401a84733ab79347a586d7502ffcdcfa0433484f5861e7406. 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/CAM460410335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e8e05b7bac80637ff2e6dd62125f9499b49bb062ada51761b88ef28f667cd6. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T20:04:52Z), 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/CAM460418541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd398344ac34e3eeeaa4886a5a868be9d2112b85e9dd85e9f48fd56eb762474a7. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/CAM460401180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bcdecf61a6fdcf3004944bddae85d7036498d2e5b9cecce5a4e4ec3bf60dcd6. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T23:55:46Z), 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/CAM460407335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68778b92904aa8978ae38062a70660e6e8e6b29b5d79e9e697ce56f8b55fd685. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/CAM460407422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42d3ce4df047a05545a9726a072786b34e4186d9feb6d56ce9262590c77db93. 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/CAM460426866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4075be50a6c2fe0eb963effbcb260a5ccc74e7f4754c2452554c0328f044a7a. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/USMRE0800133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c4bf38bfe51f6891a0ac4ecfce2651cb67709c36d5f7a5d7fd6bf615cc5b546. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USMRE0802302.