Once the transfer to the wrong address occurs, it cannot be revoked and recovered. All transactions are signed by the user himself with the help of UUwallet authorization, and occur on the blockchain. Once a transaction occurs, unless the two parties negotiate off-chain processing, the blockchain itself cannot make any changes. This is the "non-tamperable modification" of the blockchain. ". Therefore, UUwallet is completely unable to complete operations such as "retrieval of lost private key", "retrieval of encrypted password", "freezing account" and "rollback transaction".