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 0x1da84168cc88046b3852f2f3724178314d3e736f29390eda15d2bc6026c4044c. 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/893ae2f9-4201-4663-91f3-5d8bccb494a6.json and https://artists.proofprofile.net/proofs/artist/893ae2f9-4201-4663-91f3-5d8bccb494a6.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 0xf635e8f46b9148b3145baa224ec69954945dc224234c19dc84e3b08a63989ae7. 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/DEZC62129676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3898d1a20851a7123a098c4714055d3acb79cc3f07c1cbba1dc6e86ac1a09946. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/DEZC62129677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb60f758228923cfd98cf359c962f8f130b20799ec8829df8a6072ad7dfcaed30. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/DEZC62129679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc509f6a60a04ecc921f841c03b6a5fe4f535f1e19282ab4a8de00838214b01c8. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/DEZC62129684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf22f4cc5c7732f0b5522c0bb3a5df8b130d3700cb62b2622cc50c0063aa1c7f3. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DELJ81914287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26269510102296ac794f86117cd3c71b40faf1f451e5b4c3ee237ec8aeea9130. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/DELJ82043562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b95ffc08671e75504c77ba5cfda0a3b400474741fadfcc0f687ea582ab1e01e. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/DELJ82043563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8510477ea230931a7fe1c60ebd8d6ca0b6184153edfc1b0fcd1bf44c395c644d. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/DELJ82043564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0781ca33f2b2c3fe2b68ccd7ed434ba425581ba7f193145f20ebe58ec747ba79. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/DELJ82043566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900fd5e5878721c0d36b8062d186dc600e0d342c43f5ebb2fc91ec09902d83b3. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEZC62137141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35b743d000ed411219d721209aa0d816fd5f43afb699148a74f3920d270f0951. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/DEZC62262159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33fac776e6cb1dde0039616a1b9eb82a7e322f3bb9f0fe0c25632a77a295188. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/DEZC62415375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6210b7cd6926f5c0a810029f578c1994994fef919911c0043715fb6ced3a570e. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/DEZC62415376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ce60b463664ca6e178cfccf7e619f87b55669b99c1837f742c631a683f494f. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/DEZC62415377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37207013d9e7d7575a97d846c60eb8bf48abd16ea91f890065b8102a21cacc71. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/DEZC62415378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2970206b84058fa9949c3d1a9301f96373eb1a605a60a13b6e6ec02334286ca3. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/DEZC62415379.