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 0x09296c6266bba9aca2e36a324ec9ab8ee59fb34adceecbd4bd27d160fda43c50. Chain 2 (Bitcoin): anchored in block 954062 (2026-06-17T07:39:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/478ed3ce-6414-47a5-a8a7-a9e9dc6c955a.json and https://artists.proofprofile.net/proofs/artist/478ed3ce-6414-47a5-a8a7-a9e9dc6c955a.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 0x9d4209828fe4917f78fc41efa3cebaec8abbf98d3dc70e809ca1ac6a878ab824. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZES82545188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc74b8d94018e523f6bd533a3f37df23af26becf985ba8af894861bce408c1f. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZHN72507290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4479006b5536bf72374845d92fa3ac2a5e092274f5984ae6b65340f2e85d5af4. 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/QZHNA2592797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0d34fd622039306ec07e3a31be4a876c62ebd9a070b09b158e3acab55a0522. 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/QZK6Q2518646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4551b4b40d2c224ed3578da9abd5da023de5aba7722adbd76522fb47fcaf4cff. 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/QZK6P2501527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db19894d4b16c5d55c122c2468d27b7d2aa8a99d17a97ad74a1d71e279d7dc9. 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/QZK6P2501526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9dcab715e2de98a1172eea76ddf3664717e78d1f03b9e07eb96a19ffd9d0ec. 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/QT3F52508084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5021dcbf3a3c2a252effda40b01e310c79d590a46dcc853b1b70e66707f6d9b1. 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/QT3F52580981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51e6219ba94d2502c1268c9f63b8026b61f3f59f57f1ee300171ed164c4bce6. 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/QT3F52594146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f02090b26003f17de9e2a6520ac74b3335c14e6ae9ab040dc9bb6c2411b789. Chain 2 (Bitcoin): anchored in block 957794 (2026-07-13T03:10:12Z), 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/QT3FA2511295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa272ae46151e277ccfff641c1149c40a9f5b4378ae3c1ef41ab31dbe0aa3fac1. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QT3FA2596608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7895ae36e9f01bff6a3b8b86fdef5dd68ec5f507380d828a2bf0ea4f40d81aff. 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/QT3FB2549922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4fb4a826dc83745ab018996ac2e67affb5b6586425ba361faed51809078feb9. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QT3FB2555069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94bf7846b1286378417bc282e1da5cadbf7fdd05a9c0a88b69de674ec8dbbc1b. 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/QT3FC2561760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cee45bf5e5b84d4ba5d0fe6f5ebfb6482ba985542f0819f0c7af985d7b22c53. 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/QT3FC2560215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ea0e0e68cbd5575b4ac1335cfcfa3c62ad30c8ab6d55ab26037f76f2484968. 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/QT6E72525107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc173113229d0670ffdc42182e13c7333f59655c06fd5f998784abdd4810bd1a5. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QT6E72527312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4701af3fddd82a108c637999e4c0eb52d56f9287e9234a3ea5fd6158b125b671. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QT6E72582981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ff031fbe8b7deef6d9a8ab900321555139c916dd2c2acb829b35d2e757ecea. 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/QT6E72580308.