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 0x0f804d44587bd67ad46f3a4e7f7bc5f36566bd5225e38c8228d85af5c95ed051. 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/f42d6ace-bd89-4647-bf13-3f33f2ce7650.json and https://artists.proofprofile.net/proofs/artist/f42d6ace-bd89-4647-bf13-3f33f2ce7650.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 0xd6e53ab8f90661581cd97d7e49942cf95430119d30e3f3a339f8b995404c34d8. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZEQU2251382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ef4680be912ecb51a34a699b153d2af85018062a7b724c950ef21f51450ce6. 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/QZEQU2251384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633b8cb1a0737cf0646369fe118501ce470e252a094903b5dd2e7bd896c2aa22. 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/QZEQU2251393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565011e42a6c6288f5ab22e36168c995f2cd41322e63afbcdc16b5c63fcc0b29. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZEQU2251397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x913c6909fa695c6815a6bc556dc675a10b4f8c99779c80a82c0eb0abadd372fc. 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/QZEQU2251398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e0d232866e17dbeaeb5cddf6ad3656c8a1711ff563e37a8904537b881f400c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZEQU2256916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588cf1d1007d72ba952e844999ebbde83f79da11a3e9f8993d0482ebe6a44540. 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/QZEQU2256921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0c0b380eff476549d29167653f68d244a2de8a3c8160a817130b7caf084dfc. 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/ESA112309387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4bca1c7921a6cb1bfd4e44153425fc33eb11bda0fd63cd8ef51fe894b9fa18e. 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/ESA112432134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x760d5fd62c3f31b8d19ca18328a1b4bd27ece5b0a55f7826e873d3c4e8499d20. 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/ESA112434881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e390d4c900b19ffebb70980ae32370a2741281191fb4e4a302983e983555ac. 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/ESA112442826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc8e0261a3ab9b8a070706cdb24333eb2c9bfeaaa246f870901a793d541b85d. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/ESA112450014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd0188d271c0ce7b9af04900257e58b9c02b082d6f9687da703c49424f75e43. 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/ESA112457072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbb18ae80adb97e8dfa80b89d6e69622fb5c4e6212a1f08a7b3c4c53eabd3285. 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/ESA112457074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46787ab4f811a7b2279557bdd1e9fb0e502cc6c6e135789d9abce80fef006869. 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/ESA112573289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe602bbc5414eafac0c530c400ee36125e0a7a319278e8775da765a5589f18210. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/ESA112573292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdea1d42fa9dff70946992aca96feb9b3703b1a23695543cf997b40fa3ca2fa7a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ESA112579453.