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 0x6419b0a28e30464bcc56216b3d7fa7c4c378a5ad838e8ccfa72ba2f525925393. 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/9da144b3-5a99-49e8-bc33-cddad62cd147.json and https://artists.proofprofile.net/proofs/artist/9da144b3-5a99-49e8-bc33-cddad62cd147.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 0xd623f5cfdab72da2d44c639328eb709741a4748b93366b0737f3c3625c7cd236. Chain 2 (Bitcoin): anchored in block 957603 (2026-07-11T20:26:17Z), 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/QZHN32060053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024b59ba82c9b7952d2bf866d745c555ecf189fd3b309c49eadf231a92b973b8. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZHN32060057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a918ec86f7ac048228ff9e6cd3c94bd427b8a77a2f211fdd7e1cd1bee15b42. 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/QZHN32060058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3124ac6f9c42c873f5b944cff0e2c1a2892b576f84c5dd54a581fe17fe7b0f. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZHN32060061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc44724eb29f946873e3d7847820857daa6853725ee63479a5b1366017b47b38. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/QZNWS2177077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae004b380db5156de3f9632412a7659d736cd5a02f6aec754869b747d9d602c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWS2177078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5812e799401046b8d549f648e87bd17c30f9e795f063d3e30da88c92a8c803f. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZNWS2177079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0fabe1ca3e3843b1e3be7597f3848eae34bab8c0e8344220172624c380cb330. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/QZNWS2177081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e21b55112e19223c5538feb8a220c1eb3e7ebcd7a330706ba89832b4fd05e4b. 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/QZNWS2177083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99986fb250ed9c7d5a58d8182e9d12a719be5230c2abb07ea754bcf60db627e1. 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/QZHN52408515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8510b1981d271ff5398ecbd6edecef9a00537bd9ad128f065c6f590bac05671. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZMEQ2424822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65dd01a686c1e5ea52b03ca8276b830d0f6378279e0f8a314f2a024d2116eb7a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZMEQ2424823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5d23ea54c6a6ef7ec54e7311ebc735717d798202b744cfcadd0e9e05e7ef2d. 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/QZMEQ2424825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948fb2792307ebf7631b1c7c175eef3ae758e32dfc648adf195c11e8360fe2b3. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZK6H2304134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27f9b9ef29a5fa58f5e1a82b19b606cf5ade2e57bacafae5ea1cf2bee1f10974. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZK6G2471838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3a98156026b08df608b3e081c55abde1c18855e2e907d0fbaa6e1113ce6e399. 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/QT3FB2580220.