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 0x8475a61dc29b915d958e468e9301e55f049d810070588c77145662b077b1b340. Chain 2 (Bitcoin): anchored in block 953736 (2026-06-15T03:21:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/982bd885-19db-417d-9027-b99b9543b277.json and https://artists.proofprofile.net/proofs/artist/982bd885-19db-417d-9027-b99b9543b277.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 0xbd94098e5462f3385151d2ffda7e591521d0d789eae2402d3f7306f560a7334a. 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/QM6P42223821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x828d3117df577e0f5d0213fe657ec066063cff8a054d58c9b416f2d18d695794. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QMBZ92256617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fdff40f620b722e8f0986151d63d75f2a7198914f26f4798734009217e73dbb. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QMBZ92274774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe79f86049e67f495e5f2f269bb68c91933999074907ac6a65e2d597945932521. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QMDA62270442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0217add58aa0cdceb6b153d8bb4aa803695db4a4bdc2547e194e6540de9f9ae4. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QMDA72208804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499d20c5e80e440ad3314cf6ad9cb247c3e4c95af0cd0ee640d7d8df80b5878f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QMDA72290415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa8bbe99089e81fcec75a65adb15e4e9042e056a4292dec3066961e9f920ce4. 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/QMFME2257267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5f6fd9d0ad36edb8fc4ea5ed4fc9ac00565a5c09dd3dcd80709d97b8f20b33. 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/QM4TX2319891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671214564a6266f7dc4fdf31fb6b04f94c7c2dc102dfde527e66ecd39c2898f5. 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/QM4TX2348570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde4a20990b0ddb3bfadffce5cc654bb8412f8beeaf09012a12308dd6601458d8. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QM6P42332533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89112c0fb4e25d9135db78d5f56fed60b36fee7a765f27f5d8e62bc70c16c8cc. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QM6P42347493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ba4f120e5adeb3fc83fd547a365d1a5e0730fa6e1a0914a3bd0cd4304dd4cd. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QM6P42365320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbfef99eef0f8b78ea6322b692846807862ffebc7a91bd322a55cd63787f3421. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QM6P42365342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca11098e4387f5c0adaa97bc08e5ab79b1c9c1cb81f24074db117876bb7d16fc. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QM7282327663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c8c3d56487d081f98f7604a30ca616a03b6b4378ada2735afafdf89ae69009. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QMFMG2301913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88dba309bec960baf280f0095e04f7d3baf935db5940c4d4d49416884dc619f. 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/QM6MZ2488678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856a75502f1db9bba57d428c57a5cf0affc593960061e2656ab1f1454a9c14a9. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QM6N22472979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fc9c8a1149d76db6c8e56635a7ea8d6aaff3a6b6e5cd4522a2e17fa0dd10577. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/AUGBT2519727.