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 0xa8e23dabaf1cddf23f6380bbb41e16ac3326263425210c1ff66983674b6f2ba8. Chain 2 (Bitcoin): anchored in block 953885 (2026-06-16T04:12:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0cd48b8b-f9b5-40d9-b187-205d84a3ca51.json and https://artists.proofprofile.net/proofs/artist/0cd48b8b-f9b5-40d9-b187-205d84a3ca51.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 0xf91270c21f0629ec9ad926257892499648d1ed81de3a236bc44119608ec1b1b7. 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/QZHN92449882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d15dc29a8a05023d77b90ca590c7786a20de11efc0c7bd452c68c17dfc24e29. 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/QZHN92449883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a01971364a13c59f904cd9e9bdf3f06089b48ee8cd8319149bf344661280a43. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZHN92449884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9895ba6095e2fd57d5b8935f39f04112a9d38bceeaa1336987c699464907cefe. 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/QZHN92449885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0b95bc7fe01af81afd4a184d5c60d939160e473b51fdbd03621162f8e14ad9. 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/QZHN92449886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47cb85e17b881480d7538270b253382e531f9ea7d96c49eba6f310867bf8cc4. 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/QZHN92449887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd61ca8f95fe4746dd0d20b62aed665ea6adcdbfd31155beffc1fa03f78b810. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZHN92449888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00db4c2f760fcb6cdd69c3cc0901374e99ffb6a6016ded450136a17cb2cee43e. 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/QZHN92449890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81005b2c8115b7ebe9e074c43d01ab67bf4929a7569cec8e186f6874fc3e34f. 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/GBLPF6781258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc95852b50e94e524a9e79cc76161afbe3043d1e5dd2ffbdebeb125928b5f94ed. 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/GBLPF6781259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6821fa01efb410d65556fdf999e4ceadc736c8b3dcc46a535023e68de771c66b. 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/GBLPF6783334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d6b343886141e799b32f3d72789af66c866ed66a97a2952de58161f065361a. 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/GBLPF6783336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c94e10c4c36685a08b334cd60973755cdd1db4b61badf6262a6cb9ada334e75. 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/GBLPF6783337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3158099b21d384134de74cb22360e73d90d78c1ce155c85d81f5cbe8965cb6d. 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/GBLPF6783339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34f968ec274bb344c319001fbcb12a9b090c9d48e61a4ae408e67dd2e0ed306. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBLPF6783340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e5bf170b49860d3611e5dc10a60e85689084de6deef98513f6558f662d3cb9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBLPF6783198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe31d45fa34d7617ac58ad788f6245dc278879fe4b1e4a0ed2b97a07287e09715. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBLPF6783343.