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 0xa843b039fafd525783f521e19853c37d34d26df497b47655cfd1236a3fa2c05c. 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/baf47593-06aa-4311-9b1c-099a62a503b0.json and https://artists.proofprofile.net/proofs/artist/baf47593-06aa-4311-9b1c-099a62a503b0.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 0x9f9e2d5fe9c435dfd62d273876bb4d4ed31e7d1dbc1a6c3224ed25a347484c74. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZFYY2137872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e885d8f3314d847ff4e83f7b31ad488ffd80efd6500f3cb2bbca7be539d472b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US23A1584247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd251a42a0e0851fb9c6c91e9e0090df33298a08b71d367e041cef06fcbdb738. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:45:28Z), 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/US23A1570756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29dfa57ba7cf9d7fd67210b114d9816b1586ff4267d3bd0742b20a489d30f972. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZMEP2339511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2c6f73b7ca2dc9b4d99d0ed997fad654cf48120f9d68c34e160567d1d080ad. 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/QZTAY2396375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7f79b476f766cb7d888e25e6da96c441b41d437e3e461bc5ae49d8f735d73a. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZHNC1964873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x865aee47bfcf51610a4e377d60598f8d5d56e9b1d5a876210ccbe5755d65b912. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFZ61911019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd33bb1daad072154124b5947b494c74673784af4db1a8f9665201ffcd8a64a1. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZNWY2336836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e689b85d02d3dce5fe85b4a0850466f880da1da186640490088e9049f95637b. 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/QZHN72074294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb40f07dec1c04b9b323a9c27d51812103d58cd6802c47af3b52f41b0cf52ef9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SE5752097149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a904d2616010fdf1fcb8293e762a015f2b7d00bb2b3a1ef20cb98c4a814594e. 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/US23A1557741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf21a40ac14d5c113cfd9f3e18811bc4a2fd0a786f8f105e15c66307eca3ff638. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHNC2103651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71915faec93dc3adc3704d975127b429b9b56e32887b98e18b655306f28ec6c8. 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/QZTB22233706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da278a95b9eae9b0d764996e2cad064c57ff1e533e8c76d7d3cfbf825b71c47. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZTB72233931.