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 0x7620053c8dba78083ba374ed94658b5d31544cc660e9641c2f7b6e897a15161b. 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/bfa474e1-bf89-45a1-b934-7e014242ab59.json and https://artists.proofprofile.net/proofs/artist/bfa474e1-bf89-45a1-b934-7e014242ab59.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 0xfabca829f2c778804d16097cef06d9a058e65277ccc011ace69dc9450b789bd6. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ITI022000427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c00bcdbfc0aff8113437494bfe3faf57fd08099fe9930e2e57d3615b952ce0a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/ITI022000429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9880f31688bee6b1dd10e23ac5606cc13bd8fa18276342d84752ee447b2f036a. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/ITI022000431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6733a201d5b3769ba4c28bac47a13786d1800cc0e8bf604d3d9d878f1f170107. Chain 2 (Bitcoin): anchored in block 957531 (2026-07-11T06:55:18Z), 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/ITI022000432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1edc0c63dd1c3fcc809d94097a0320fbbc973b4e966762b45f03e8f44ee50419. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/ITI022000434.
Henrietta Leavitt and the cepheids variables
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477c61370eaf388d25d615c9334342147751ddba17fac38b8348f5041bce132d. 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/ITI022400335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e2d30c8b6c3f1c54cfe998cc1ba2791a5c1f0532f81a9bf20b4a628515cf73. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/ITI022400342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e92611c88a1f6f413c03ee2252e40557e80d9af4561d88216cc4fe1e8a65c6. 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/ITI022400336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e92611c88a1f6f413c03ee2252e40557e80d9af4561d88216cc4fe1e8a65c6. 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/ITI022400336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c231cc715595ce0b6e4e0de04c32bd46946a103a460320bc9a4bee351bb8b6f. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/ITI022400337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc152bad17957fc60c8314fdeb271634edc91f2c76245a5235318fd127619cf8d. 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/ITI022400338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aee71ad9f761c71407ca270eda1b9a1fd5bc616f9c242800485d486b31cc867. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/ITI022400340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e2d30c8b6c3f1c54cfe998cc1ba2791a5c1f0532f81a9bf20b4a628515cf73. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/ITI022400342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb859bde772344d0c0124f05387012eb46305e3d4e79ef146df27e238de760a2d. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/ITI022400344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7c3cad95939f66162cfc722602cc2df892eff3c3a808be1b1bb57a704e680f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ITI022000430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe12594bfe58458202a235fe03be5838cf13cf4c37a03b42b1f9ff6c307b56ecf. 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/ITI022000433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7041bad79ae1200de5dd6570927e52b63be3243d322b4d4fc7fe6544097c1747. 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/ITI022000428.