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 0xebe1275c81f844f91b938b90d29188443ab668fae66477d2891a0f6e4631270b. 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/da1815e8-0b31-4598-a5b1-71cbdefddb92.json and https://artists.proofprofile.net/proofs/artist/da1815e8-0b31-4598-a5b1-71cbdefddb92.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 0x9fa15b9e44dcd76ae3bb7f56c114d766d4404469e234877bb9303deb7016d3c8. 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/BX4IU2336072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad631069d6854472f2e6211e246bc7001a2e888225856b6e041e8a73eca9fcd0. 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/QZZ8B2468408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1ad79265c7bde9f97f0b7bcefafcf8855dd400a30f9e401071ff5a76abe2ffe. 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/BKCMX2300152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf15c29c18e45d0fd760f2a15d846d9147da2dc8ff81394e1c3dd763762383e81. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/QZWV32420631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af6333ad675c5c86592718869ad45925ba8897f1c62c348e28c4a1d5ac311b9. 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/QZTRX2424402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea87bacb3480d402b95a4cda536918b10994d31bc2c429ff7e95328308df7fe. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZZ8A2432718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1091852c9bf0bbe1c2e72e56f89a1a8828861a9e73b2e1bd241c88bb115968c3. 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/QZ5FN2424983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7998fb547f4c6667e31d546be4b709fcbc4652741c5d2aaf3310e3ac8c0a93bc. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/USLZJ2592569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ce0199df32a555b08417b1c535d3dce481176ea515b6cdb3b0c763d9b47648c. 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/QZ5FN2548717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35907d0340276ffd03416908548dee86770bfe9cfba8b89dafeb048c695e3805. 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/QZWV32459125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1c7a59f98133289ca4ed9ba1ef3811e9d2d0a55c4e837be6300703267c8fca. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US7VG2564032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ecd82aca20780700a761ad994224912a4b6a39146d832e5d9e1f3fc97c71f1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZZEB2468751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b98a8d88a47d36c839815bf86dda9dcb89737de8f5f5f5bcc63a94120c857bb. 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/QZZ8B2468393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe861ef70d5b47f6d8321d29656255b799145e846aa93b0114734877efa0a28f5. 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/QZTV32482595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1276b13a09c9838001fbc8f1b27dfad8dc3104a81ce2c8651273c823faa4319b. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/QZZ8A2436831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9618d164feaefdfcc890563bff9600d3914c5217b0c64db297c282fc2f49563. 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/QZTRX2525123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c58b2308a349ac00b6599e2c2a1d2e811bd25f9114951b5f5cf1cf1e94640bd. 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/BKCMX2500052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b701384c5968807baaf533cef1e408ae5fd15515eaaf5c0e0dd85bd0b2ce62c. 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/BRSME2401038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a930c24a8448e8071aabbdda5a727c153a602a8cd5e29ebcaab141897c0dbd1. 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/BKP9L2500053.