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 0x8410c232fc33092daf9438a577a633191f5c07caa289ab8b0235fd87b42a28b3. 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/b248fa14-28fc-48a3-9cc2-ffed6a73a8cf.json and https://artists.proofprofile.net/proofs/artist/b248fa14-28fc-48a3-9cc2-ffed6a73a8cf.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 0xb62bf7d7300fd6f039af588d428956f894756396f2fe480cbd72c169b22a219f. 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/UK6821728749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad813406757888331174c7c81ad6046239ebf4bc939e9a9d0fd68779ffa3c67. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/UK6821728506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b9bd6848778b7d77e6b6b06aaa2befebf61d4bf4d1a8b0b8d2116de62993d9. 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/UK6821728488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f3594497d53d7b082d2a8a1e2e5a3c40d3345af3714240480a38e748434382. 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/UK6821728904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x087af44c5ebc1fcdbd783550cc2229421b10435880fbf9cfa68d9db47ada4b8d. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/UK6821728880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190a63594c322b0bbbdb2d91f0a9702965d7ecaf60ce4a9297b753cf934ed963. 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/UK6821728884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x228ef5ff8e4d9e69db3d1b8ca917ccd64dea4a143304dd35384a7780bc15405a. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/UK6821728876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2cec7c8ea06b38241fce338e2db44c8386ea76df63e0cc4230b3e709b14136. 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/UK6821728939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb472e5ed99afbaf828d1c9a150683b17ad966a95e6abf1277610479d2b386727. 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/UK6821728926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923fa35f5ada49f3e824419a373a2ed9edb91cdc9feb166bb60057eb5bd280e3. 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/UK6821728896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5aaa97dbec664b748233671ce1c72ddca1b9a7d9b1a79118dda060bc95b0dc. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/UK6821728873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2e5c15de130d4ab2944728817141fe0c2d4db4a896ca3eea2e2f1435660be5. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/UK6821728861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0b420101c60753263dfe0911f21a004ab69d8500b165b984fd6412d5b266c1. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/UK6821728869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34f03951c20a017911eaff12c0c6e689ef54cf02eb2112e225ba02a1bcbed29. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/UK6821728984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca2bbf5d3c5102039bbad44f9ad47d2f42186397e2ac6bd12946fcb7671c1ea8. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/UK6821737643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27f230b6d60c2ce662c531106687ed3b60ec409a4f1513ede015f3bbf7f51912. 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/UK6821737632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6282458dcc2fd1d603c2f641cc54a39b4f911295b18cc7bb131388d9264670b. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/UK6821728913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2f1059e64e6fbe00847aa560af55c3a90a4c1b9620d773b73e86a2ee552038. 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/UK6821728929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ebac7f646ca4fb55cfa43b9cb8555bfa94cbc3bbece211c56ea39961e9f8843. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/UK6821728895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6282458dcc2fd1d603c2f641cc54a39b4f911295b18cc7bb131388d9264670b. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/UK6821728913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ebac7f646ca4fb55cfa43b9cb8555bfa94cbc3bbece211c56ea39961e9f8843. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/UK6821728895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb66bf4778591fa0db4acd32c50283d5f330e981b76c8491d33cf0fc2ae0d24f1. 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/UK6821728872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e78a38d743eb74f3c073703819ef80016f5a073e2d12fb2204ff94d1fbc73ad. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/UK6821728509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfec78dad106da0a9c47cf13d6e574d454260f9481c9f0724096b2cc291948a1. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/UK6821729000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01afd06995dfe45a0b186ca1022d3d198954cc20c4ffcd25105f9b073f74f3b9. 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/UKZVC2000457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f8163cd8dc3944b4cd2aa9d257b4708e337f7e0a4df5da3f68dbe0318217c7. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/UKZVC2000408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7240fc69cd51366365284945593c95f29783aaf309896462dac1dc401ae5f1. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/UKZVC2000468.