Cao Jianguo (; born August 1963) is a Chinese business executive, and the chairman of Aero Engine Corporation of China (AECC). Biography Cao was born in Zongyang County, Anhui, in August 1963. In Sep
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94f18efd614891fcff429e71b31712d52caf6ba23de6829ad2b27968a6d6f2f. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/389590d5-00eb-4b24-9a99-771c4e278e73.json and https://artists.proofprofile.net/proofs/artist/389590d5-00eb-4b24-9a99-771c4e278e73.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Ancient Chinese Music: Wild Geese Descending On a Sandy Beach
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d3afc7001f7f91a56061d80f44d9f715dc43a471f7a3f94c0b9a131e62ed01. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/CNF130343804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bbe34eda15808607cea1d2bb18d3e4c021308b8aecbcc081606cce09400a535. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T22:35:59Z), 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/CNF130343810.