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 0xf759dfa9f6b256fcd60218320b4394acdd4fa40cfa8c92d51da2c2b82d94dbe6. 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/caa8513c-d902-449d-9015-fe0ce744f9ed.json and https://artists.proofprofile.net/proofs/artist/caa8513c-d902-449d-9015-fe0ce744f9ed.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 0xeb03ce3f310e18b7654778f404084ab3dc87b65942538f99691eac6783bbd904. 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/US38Y2400314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x181c762532133f9aab0f9d8f989a216222bddf672c8dbffe794eee14ea805b5c. 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/DEPI82405138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d96b882a17a2bdb812b239e66bca29fd0d3260bcc0ba586f655b4c4f530246. 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/DEPI82407203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a758a1fa3cfa89b6d11523329e2a42615412ee42deed4d290efc5c9907e3602. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GX89G2497684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3d959dfa81c15c83ded69506a2594b2e66f3e3df1dbefd6dc972ec1c14b866. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/GX8KD2417915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43d36bc8dc6098eb5ca4ad14f3cde5a8eace2b54e85c5d0344c41a141d73f955. 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/GX89G2432144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd57be6d9962056c27f99a0e41d6e1909f7451d748b95159121de274ba09fd0. 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/US38Y2403292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1279a2bbcf8019092a9f87843e407e74903939c13b61e152b3620cfa93bcaac7. 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/DEPI82318710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822dae98b14294918e386bb7cf3dbae83c47bf0ce370775bb4319eb0d49d3cd2. 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/NLRD52417706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1785bd6e1660151103ba6f6df34da9c4a3770895ebfa410e858e6c11ec36ccad. 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/DEPI82411974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x788ecbd5bbd18dadc8d7bc58c6fad9c40a63745fd03cee8a8bf82a93924c5da8. 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/DEPI82400736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629d8b9b62bf8e4878c8295b6343bbb9551550f677f75a337db746c271f67f40. 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/US38Y2432295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f446c53aa42501b44a56ecd1bc8b5dd4d4db97eb0faef5ceaeaacf24489534c. 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/NLRD52419166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd953e00d66aea23b883978d9769a4d8590bb180c6c4e70af6de7440e504c5a27. 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/NLRD52419167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74919ec6dfa955bd4b2f438722f1b3832812abe4b47bdaf25e1e04a598d12589. 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/GX89G2523535.