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 0xc7c4ba5f75dd62d70ff33208d7d016ab429ff58188a6263e9fc73ca457418085. 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/eba24bad-2ecc-4cab-932d-78f423dfafda.json and https://artists.proofprofile.net/proofs/artist/eba24bad-2ecc-4cab-932d-78f423dfafda.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 0x01fbc9eb065d93c56a0bbad9af61e1bd53a29bfb114ecb4e7f8a09cd275725f8. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZK6P2202497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4213c24f30556001d4b6ac957ab717a26c1058989c3c8016085209cf1bf86afa. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6K2160847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31721bdde2e0b2cb75819aa38d71877c55ec4b4d38a8c45c2439314c81431687. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZMEQ2125942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ce5326541ae10a025bd09214eec0cac9acc03133929ba2ccb054bc22c5de28. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZMEQ2125943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd19d74c94a455056e148c091055f34b485158d361fde8d8cafa7316ca0573113. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZMEQ2125944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ee2e5518f7810ae40e4f1a46f330ae4e5a03923c46725e9b44b480207233dd. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZMEQ2125945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f73c3774d885a2f8f3475ad038f9b85012aff143c9a984285e87407cac38967. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZMEQ2125946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49491da92b0ea322083533fb3c508f9cc499de97097adfad3e4628ac5f1f93e3. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZMEQ2125947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dbd822f019db0632886c9cb14619d288c98e40f3347cd8e13cb4a1c374fdeca. Chain 2 (Bitcoin): anchored in block 956404 (2026-07-02T22:12:38Z), 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/QZMEQ2125948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x589981d6772c07749519f1e543bb03efa4729a4a912c573819a4eeeaab8f6852. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZMEQ2125949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00d3578807aa96c3d6bd716fec3609de097183b6b65b0abd78af68a0f54c221. 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/QZFYX2318784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b86eace03ba825719c892d6f9c4c85b72181a07c081d79d0ba6aae95f42b3f. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZFYX2318785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd9d3587fc4d86d70f8236708675e822f99eb6f6da5277055faf24398e4509d. 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/QZFYX2318786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5fa4f041cee2814bd9df291bb081d10c8eddd7c238387ee61e29bb2c060820. 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/QZFYX2318787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a4294e457f39559506961cb185415f88f500ee5768e32caa31049a600e239f. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZFYX2318788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae7a4aa270cf65394daf5456367900b9f91274b20da81fe4d893ec29b9f96dca. 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/QZWFM2451846.