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 0xf370b6d7f57a3e3fb56faea461eb05f9b68dd679fcb6754097b9d5aa1a0e85e3. 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/3524558c-039b-4053-9664-cd9b8e15ab14.json and https://artists.proofprofile.net/proofs/artist/3524558c-039b-4053-9664-cd9b8e15ab14.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 0xe925e2f79f1943828b62ffc595a20fd7fe455e6d8bbdb6a3c4f5680f5eebaee1. 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/QM6P42424551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9581d4c473a4c9dcf8f1b765e2d38abe804e236d911288469f7a1c9b682f4158. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ7FL1950028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1900a2461b3b09842459de5be42eda8a44058cd3935dc87433097b159d5e0b. 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/QZ7FL1950030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b602b77b87b127775743ba63d38ecae9e476a4fe8e0cd2660aee0a0af6cec2. 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/QZ7FL1950026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9a99895b0c31a56e7275ad2d7731268265d2eb08087cbe81f77866589dd794. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ7FL1950027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd755de93e29e98b35975646ac222f758490b7027739c2662634a2d9ca90a3f4b. 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/QZ7FL1950025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2687929a1fa65a66a338644163d83b3e8c0623cac4a8a05931b0b0118235d788. 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/QZXF32300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcec6eb6c47a0b816bf7cf0ddc8d543dd66a775dc7ed8476566b6bcc1fd88ac00. 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/QZXF32300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7848d972c7248c79f4c3d919993fa5e662abd1f128bb2033dd9b795faf3dfe6. 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/QZXF32300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a4697030710838846f8930d8d7398b8986ba26b07fad1fd2d452d2413dcc98. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZWLJ2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4846dd1c4130a501cf58bfc2f76ac3470bf710672e60243bbb3156c2bf0878d. 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/QZWLJ2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfefc067d89a5ab5e7556c08e32207ef95086755f56c037924a9621b5f3496bc0. 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/US2762202193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfcb7aec8b40d10f714ddbb7561c54050450ff2d5979a4a697762cc736158a19. 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/US2762094043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5314aa218cf1275dd7d1441b4582598ddab3e9a06969e6649fcda53f4646a8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US2762094036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972ee2350086faa8279a21924e6940db21d7b6fc14415faefc97cef5b34eca2a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US2762093955.