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 0x18712e2ca4e8c35342a07af3bad3960cba638e4bdf00fa1e91b51e5594452ccd. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/13f8ee8d-aa40-46ec-897a-5aedae0ae474.json and https://artists.proofprofile.net/proofs/artist/13f8ee8d-aa40-46ec-897a-5aedae0ae474.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 0xdbbcd4998cafb024ed58c906aa30faad28ec00d272c9da3983d518d3bbd6b743. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/USY282319660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f289620e839c963865b6619dd0978ba68c29bfd68027173226c1fb8774f1c6. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/USCGH2423359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2dc6ca1b639dd8a879996657c33a3820e5c5c177d2dcfc3dc8ebf4c29ef2c81. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/USCGH2423360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ee5f5a76709717a7514b866fdef9d87f708eb7daf679fb38e3bdb17a371330. 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/USCGH2469750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x061eb406ef6a0e412d35555a84f1565e4253036d640d2528fcadba9bf49e2431. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/USHM22488109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1413062782cd4866e4cc7617af5f99a347e168e743b6bbf7770de80e2cb646cf. 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/QZTB32450208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf017c1bd8d630640b005985d7dca126ace5bd8c138deca35a6df2e15e01a2e5f. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZWFV2434258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427ccdd5b4188db723964bdb7a871bf1858507db1d69722968dc5b13be67b7d7. 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/QZZ7K2455723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97677bdd56fd2cf596aacd41af1b690c3e827eb8563eebf7e590cd911e430564. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/USCGH2575397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a1ce57400d1a33c5e8c9cb1adc150197cc9465ab9a45bc770cdb6fbd766cc0. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZMER2525180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61dd962432fa25f89cbb0dd4d042288bf0a25ce48cfd8e974ca3185ca791d9f7. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZNWX2514937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b6b11e2776afcfcf24a2175c7f66f63c41937861ed27929fe83ea1fb6a79b9. 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/QZTBC2581737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27dfcac744cfd25046a08c07346aa9014d71717f1efb6f52e3604b03efce5d4. 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/QZWFF2506526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e576ca7eb34e96367e948f6d648a83d872a3abd8848b4a07ef3c6ab8df279e. 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/QZWFJ2528837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c218561f89be5d756d1feaf43d687bc4e016fc5ea3345e8cf148a02a4c5a93. 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/USHM92501510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa422b1681a8bebe2c0fbbc505fd96b299ae11cd6a4f941232e73d1091418ea. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZZ7L2582584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dcc150c8421632deda77eab0c62af2d38fd8460480a8fd2f0d9aac83ac7b8ac. 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/QT3EZ2576298.