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 0x9a7ed097509f6af29f82c35eecf58102cb1fb40d70220d5122cbe8542be52478. 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/68b4b919-bf39-4092-a3fe-546d41decbd8.json and https://artists.proofprofile.net/proofs/artist/68b4b919-bf39-4092-a3fe-546d41decbd8.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 0x8caf6f15cf34e0907f49fb9379042ace87bd8cd89607381199e490874a114f93. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZK6Q2008237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a7f69d06efb8d64e0d6b6baa99b3bce9e6f9700a0d8cc02bf00d6f9f6e26b7. 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/QZK6Q2008238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f692b729b77692c46fa8d057c02545a72ab63b9cba0f678ef3567fb8884fb7d. 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/QZK6Q2008240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb07f1ce411d1e65aaf5a83cb754df9b84bab9851ed7090b0844d52a757a8863. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZFZ32156323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbcae7cc9285d2c797dd0059ab1dd11a754095c038920cb917957f49810cda43. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZK6F2148358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794a36332db21b3becc38236550a9cf097ca2dca74d7ee153e619c30afed5f1b. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZK6F2148360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf9483150f4ceb60311e48d05d342a9578e89ced3aef48501933dd54bbdbd7a. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZK6F2148362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3ddd5519dfd0db5c3411b1a28da9ff5ec85e1e67afd927bbcda857cbf3a247. 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/QZK6F2148363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcecb2465cb62b2a8adf0ed2c67d2a73a0bd585cd3d85dfd622bd379b0be8e759. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTB22236690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4099dfcfe900a45cfe329a80ad7e6518ab6aae316259a0acb5696009324e467a. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZK6G2443439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c5a0af62513ce0cb7f688b1e6ebe47856dbdca9629463c9b5d441f8123d725. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZK6G2442623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e0f646a6f35b5d87bec65685b46f0e225191397bd0c7f5909e41d3d4ab9d7a. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZNWV2454232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd245e6f43435ba22b7f186d5b80c3bf0bdabc977764f59d4bbc050e193035582. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/QZZ7V2401358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbf5c3752de2dfbb411f215a573a40302bab547fd4210f3a440591182d7c68b. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZZ7V2401359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc530743f913e26a6ead63379a7fc480be2f6116603fdad9c0536904849ca4918. 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/QZZ7V2401360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e22693afdfaaca7633e4e03cbb6c23590a46ccaa7dff2397576f2954717c99. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZWFV2594326.