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 0x845d5819bea8e70029486f4b9912503a1a06a224cf900695b502547ae82e6e2f. 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/3b075cbd-c614-4218-9f82-73731fcd5388.json and https://artists.proofprofile.net/proofs/artist/3b075cbd-c614-4218-9f82-73731fcd5388.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 0x9c3bae74241812a1df57a7c7fff71541da2dc080906e3dee9ce997907a176050. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/FR2X42341972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711e284a7929dde94754afe7d1acb8a429bb47febf278152e4de04b644d38177. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG732225184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727c526562524f16cb3bd53cecbe8ec5e832726be0095df09b38d95ffa42d6d6. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/HKG731789538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79abd1a7395bd60064079003c81d0437f9c52866f1b12fe8110b3af32688f19f. 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/HKG731788326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd4e67d878e5a63f931c1ecd027e15abd88618109e8e5ff25f6d689688b22e9. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/HKG731726711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e0af8c1b9db504a454c3d47311208dea819c2bab1eda730e3df52843ba40354. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/HKG731868673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe101412a3c68df9b74806759ff635f2e5b782b9bdc73ae98717bf349d38b89c8. 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/HKG732104564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aaac76eb1a4588017f87399987a8a0c9da94eac828f3b7eb9fa272f186c093b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKG732104565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d13fbb628f9bfd2d6b328e40333c8f7f9966f38e6451317834cb3df1da2bb42. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/HKG732022689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a5255a4db4ba18063f23d043ec3c0ce9216b1f3db71871de753cb37af91dea. 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/HKG732014366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe449a1dcaf1cef032b265f1df1de0c6eb8d7f75f8c76f6f0cfb9bce21f1039e3. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/FR2X42046617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4470e75332b95f3c17aed956e1c507eae7e169c9ec32ae66a8aab6124eff2ae2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKG732006762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea468c4623e32b306bd96233759b9746c7a26eb9f8a123c82e6773eed60a661a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKG732005672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed82516aa8d1ec0b48a77e1007dcae7f0ea75a8f15c5f1ad5857abdf468023a5. 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/HKG732001425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca87b4063c00cdbad7af66b05f133bd7edc99a615b120da315ec73df5e742d8. 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/HKG731901340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87b1c0bd080388f116403d6ddc2960428867f0552b40c1309dd6af494826e7ae. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/TCAFC2087526.