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 0x8e60b889e41d326f70396f421ae13a9d746085dee41f3ca5f8ea4090fe3bf94e. 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/f73f894d-3780-40cf-9505-80e3fa88107e.json and https://artists.proofprofile.net/proofs/artist/f73f894d-3780-40cf-9505-80e3fa88107e.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 0x400ad3db4a57b2febca47df89bf754b532d2f58ae8c9d812eb7e3a78d142a663. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCADC1775230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f6493d75915a15d7cd9faf09aaec60fe852975ee5963f5af73c400b7044d63. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TCADQ1847511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbf5708a10135e253f4c0e68112b0b8054fd62d3fc3f5f249d2df78dc623c5e. 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/GBSMU5667727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485e03a14c286b84ed202f96274bd0df5f9353bd44a0ff3fdbd70d02a025bed5. 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/QM24S1844355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50637754846a17be31abd99fcfcfd3cece95d0a92ffa3416ed64d09b968fc9c5. 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/USA2P1896119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb90ffb0a9afd521538348211db95f4b4ebdff664143ec6a9b37ad0d8dff83a. 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/USA2P1905031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54f4cbc757131a6af5a3209082459607168c75b6d3fcc194bf5ffc10fe2608a. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/USLD91718262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6db01b3d7f1be0739e45f65f06cd49b44df481ceec29d43f79a6982d65c59e16. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USA2P1960293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ff2276d3a96e3f5460f3d058eafa8585e1a384d21284f006936ed8bdca4573. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QM4TX2035983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8800b1d93061b13b791609ad69bb36a01094d76de4d616610112ecee3c44f01c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QM6MZ2019097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe67f21fda8ff4e083d411f9e578f93c2abaf9a2ddfb6ab1c03ac6f0df11984f0. 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/QZK6M2019103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ecf3abaf41247e27b458d999ba0f690ea475480638b9857f0f110b5060ad310. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZNWY2019931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe703ebc249c618f052d897fc01d8108b2461bb15f207d97f30dcf378b1064feb. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/NLRD51632600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9f533a53cf22caf2723bdc37492b4dc5fabb9063d20598c2a612cefb3c23780. 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/QZKDK2130355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d4cb745e18813e2334db903fa898bf1c7ff17ca35df6423f576479c4f57b17. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/TCADL1846933.