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 0x61bf3fb102d3687ff3f21a972270b87c36b52741bc912b6aa4ed9009af68577d. 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/e0dde2ba-e54e-4b81-bd00-82c409fc83f8.json and https://artists.proofprofile.net/proofs/artist/e0dde2ba-e54e-4b81-bd00-82c409fc83f8.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 0x32cff5c6bbececbf620184f8df240b2c0eea9bbb042176c1b759496c3232144e. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZHNC1988810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e0a194cb693c1ed10a0ba79157fc99ab2d25b71b3d5db2b8c7b38deac92944. 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/QZHNC1977951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc7bd6b4910c3990e7c1c29cf5cd6b3578be4e8d290ae15bf5a35526cd71e914. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZHNC1977952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a311e9cd4df7d503e2e544b0c07f19b803577868f289ba5c091cca05577dbb2. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZHNC1977953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebca37257c9c3bc22d9d57d20c11dd8b8476091053849de8110dfc062991e15. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZHNC1977954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec193bc470da4085336dd5cfdf05cebdc606f7ea4ee4f859547d99e3a86c64a. 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/QZHNC1977955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73897a9f8057458ca007171dd8f4eb61e656d695b5629a2034b1bbb33e28029f. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZHNC1977956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc45fcc430dcd0e6c95c384f3d0c86ddc7218c7c8998cb8616277d59d682056f9. 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/QZHNC1977958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x111a181c7e00cf54be08d1c7e1f70aecb3027b3391165fe34fee176434f7a87c. 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/QZHNC1977960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ec9330aafc164e8b7075c00b461e65e089a1a8570ad384fa6da9a51176ee51. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZHNC1977961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e165861c4092d52bac4e0cef510a21bcafcc179b5118d8fe0c17739cdd18796. 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/QZHNC1977962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ea7ea13e883a60c96a6f1e9a7b2589bcc3d3e0e9f0010487f47b47684e0026. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/QZHNC1977963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b64b1e4965d353186f940a97ed757644195eb385f5b7138c1b210ecfa6890b. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZK6Q1918140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a50945e7f62a2508832716ff0353f58b839a8ec0a0cbfda0915c51f0f2890d7. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZK6Q1918142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d1c9615d0862f7b19340c9bf80d65205912931cc3133fb069e7271ee1cfaaa. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZDA62160974.