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 0xfbfc47e9e9dae74c4ed28b38353bbfda23708c862e26243cb66b16d4740c03f0. 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/87065f31-94d7-481b-9069-965f8dfeec6f.json and https://artists.proofprofile.net/proofs/artist/87065f31-94d7-481b-9069-965f8dfeec6f.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 0xfc3d03514571ae2da4474e38a9fd54f6de830f4ee6f37ba964ed2bee5c916dc9. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZHN62433156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ad70d85941286dac41e84436a1f0d1e14a81c9bb458ee2df9ac942306877be. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZK6H2252781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc5cd2e540930c0a48621ace818690eff9e35cf4530b2a0a532f99fa67c3aba. 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/GX3Q92123332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679bd2b8bc5ceb9ad2664690e42955ab627ecb8002ae3db015b0f81a93d012af. 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/ZAUM72100096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3da143521d29ec80508ae50cb7a906a2d4a6c99bb4c3b498822b215fc948d316. 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/ZAUM72001717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bccf922f4e8f454aa844495d87a6e7b28fe3985ebbdc09204c73167fab4563f. 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/ZAUM72000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x187d4df5df416ac870c61bf3b95d3c74921ceda2c29f8af4aded310b6cd312ca. 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/ZAUM72001373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b0f495d62ee51027dcdcf40ceed40854488f32e3aab8a9f005e06474f6d3ef. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ZAUM72001561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe87ed497db3132538863133273c684d00a9fb269ee8a903730b2aa0ef68285f1. 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/ZAUM72001560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30f6bb11b9ec2e71cb04ae79ac971114626596224917cc835c434d77fbd6b44. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/ZAUM72001559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x187d4df5df416ac870c61bf3b95d3c74921ceda2c29f8af4aded310b6cd312ca. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/ZAUM72001373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53c7123546bb11533bae4d34b15777aecff3608a2496f60a628f4527511001e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ZAUM72001188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41ffd1bd98439e1c7e109cd99c5cbfa4e4660dc142a6f6b4add3744ea5e2c6f. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ZAUM72000309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bccf922f4e8f454aa844495d87a6e7b28fe3985ebbdc09204c73167fab4563f. 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/ZAUM72000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6547427a3a751f5f94f340c34b98142c35a0c37bec39e727b5bfbe24aee56d99. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/ZAUM71900547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5164f82693e72e953f2f02f55c201528403bc839d1ead7421dfc242775b2ae. 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/ZAUM71802259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeb66726d0a16cc4506cafeaa7d98c4392d12bbf4d94b62b94431793472848e4. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ZAUM71801204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e50f3a886118d15caf465f7da20393cb4e293c5883942c300b2472d69d6e7c. 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/US23A1554444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc45589edb0a2ff50005aae5d9d31865809fdda2eb2000f52adb50e98f659663b. 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/ZAUM71701753.