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 0xdaab7f5e10fd16f62a6da322941e79ec95bc2b352b18674580b5d5db7ed34d0b. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/399bb4b8-d402-412a-960f-18a5a72740f4.json and https://artists.proofprofile.net/proofs/artist/399bb4b8-d402-412a-960f-18a5a72740f4.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 0xf3763d64a03778a9850fd1520efa51370ca2b11cbcf7f32a525e6052e969fd47. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZZ7P2576643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde400667e002e035412c9677772dc1c8b49e23969cd87e4580fa2d5d85600246. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZZ7P2576649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd05181c59106cecc0ea83aa26caf89cdb1959af0227e500e531e94974a415b97. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZZ7P2576650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d33b2a635b1680ae94ffd2d4ce6d96b744859e028886305c6a0d569961c777. 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/QZZ7P2576651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b26ea7ae96aad9992584335efb02d075d584d09b3ffed1672103c85af5ef26. 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/QZZ7P2576652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x023ea872c77a0909f7a9cada398f53250954d386299aaf59c9045ac8d1f4b052. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZZ7P2576653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc713a275528d9f09645f1cc50c56b6308f18588264047333f4e2a97f3e698b67. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZZ7P2576654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe297552a11f8a2f75bab8bdbda715d3454ffc239c2818480f28357642697f39a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZZ7P2576655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ae6de273688fa78fda35a01ea8710d570828673e18e2d931ecfc216fca4ea3. 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/QZZ7P2576656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53239b98e0dfe6efbf4ee618c44cd89f5b542866911891ba54e36770ae9a422. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/QZZ7P2576657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3201772ffc177abbcb96cee3e2a4f3f42f62a1e6462f6b303a6001dc6658cb2. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZZ7U2557664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7e9968a1248afb393dcd6363db7fef78663f6b467cce62ae1206aa606be19e. 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/QZZ7U2557665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38345d20c9d5984385a036e9a16a0bbaad59a784cb25fad1a97357a0f975937. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ7U2557666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa076560ce6f913982a50d087513f9b1ac508e1c09b22610322ea9d6c706b374e. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7U2557667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046d13f6ba6aa7ff11626cd2256eb9c65fb01576354abffa959f1a3154ed93cf. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZZ7U2557668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e46d4a53ba0d7c5b279103d0db49558b83489745fd6cd192b3343508ed08f2e. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZZ7X2573276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6cfd148b5f1a8d1af9b0a2673794a615058d284a63b090fd304b6f0e2d775b0. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZZ7X2573277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a595042113c8331fc92ced25b048074fb8502dcb9812824f3dade4a7c3bcdc9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZZ7X2573278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f51f2fb7fd036c298db5007b76df0aa6ecee3ff4d8c8bf5cf538c592b52ba39. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZZ7X2573279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b416f43d5cca2175b65c6135ad249ef5779ecdde741a2068d2842bf9b28c8c9. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7X2573280.