Blockchain privacy protection method, system and device

The invention discloses a blockchain privacy protection method, system and device. The method comprises the steps of receiving an established privacy model containing a transaction format and a privacy requirement of a target transaction; respectively generating a local encryption SDK (Software Development Kit) containing an encryption API (Application Program Interface), a verification contract containing a transaction verification API and an algorithm library containing algorithms required by on-chain transaction processing according to the transaction format and the privacy requirement, andlinking the verification contract and the algorithm library; calling an encryption API to encrypt the transaction plaintext of the target transaction to obtain a ciphertext transaction; and after theciphertext transaction is linked, calling a transaction verification API to verify the ciphertext transaction, and after the verification is legal, performing service processing on the ciphertext transaction based on the algo