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 0x6015deb12ff416404075ba5c04f94c9ca6ecfeb55eef6625de5353d7708c7fc0. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/95a576c5-5b3e-4fbc-979b-b7ec3168d4d1.json and https://artists.proofprofile.net/proofs/artist/95a576c5-5b3e-4fbc-979b-b7ec3168d4d1.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 0x1b4fb238420628ddbf7d38839fdd266bdc9155e22f288bea37bc5212a9233ec6. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZNWW2231858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea289bd09c1aa4ee34145979e1225647997f25b79aa069d7d31b5639c2c3fed. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZMEN2370593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c8c45bb64ff1940cf5b25f458bfdae79e8c76de89762c335dc7ab8f6facb52. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZTBF2379398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5152c685ccebb6eef82496eb5bb7514526e136ffa090301a4106426bfd301cb6. 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/QZTB72382622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20efb81e358c53e2efcb4a1b1ac49de6611dcdcb086b5574dc23bc053c4c22ee. 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/QZFZ32413484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62bac7672b2c30b8fc0995fe375ef732ff022246b9ada9585ee39885254d49d6. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZTB22476530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06fe612a396717f82c8403d448b9e89adbb6fef43f2031443f726d74fe538079. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZTBB2458414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104ce19e71623b2039de94492337134652b477574fb0b6ac9ef741462149e99b. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZZ7L2408626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4620c476ff09081aa7a562f7d4e08770cad03beb6713e27c8f3fdb9db6cc14e7. 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/QZFYY2508544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7789110687409fc969cc5138d6f120fde968f136d6492ac2e9afda61dea0f3. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZHN42560572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b02125cf96ca0550e6f8b35e1f66243c369580d2e2f5885822d7d91dbef164d. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZPLR2513034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f448d6b7730a186b4bbca96a5e7138639ce5ed9dd02e8c054eec27b99837146. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZK6J2552736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc47e9de5a697fd774dd9523e4752ea934f530d29c7f2f78ede729bf4d589cea. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZNWY2562200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3721fbcb11687e91ce568fa92ae393a3c97e30f434fd896589d2d7347c39c17a. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZPLR2513035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0b7bcd404e9db6b29704bc52bb1303a38f963dc566f3f6893a2b23080441da. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZPLR2513036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06fe612a396717f82c8403d448b9e89adbb6fef43f2031443f726d74fe538079. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZTBB2458414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8f013291f813045a77019636029c1c516555eba53237f3163afbbb463acb074. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QZPLR2513037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7789110687409fc969cc5138d6f120fde968f136d6492ac2e9afda61dea0f3. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZHN42560572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5b43aa9d2c7e03e3be541f13e2d2f1a640ca825b149483554a6f8386f5db6c. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZPLR2513038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc9707d80733228e00d1b28b315aa62962806bb9d6d086ea0d5e8ff35435236. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZPLR2513039.