Wallet signature is a step in encrypted currency transaction, which is used to verify the legitimacy of the transaction. When you send a cryptocurrency transaction, your wallet will use your private key to sign the transaction and generate a number. This number can be used to prove that the transaction was sent by you and has not been tampered with.

Specifically, the wallet signature is obtained by encrypting the summary information of the transaction. This information includes the input, output, amount and other relevant data of the transaction. By encrypting the digest information with the private key, the wallet generates a digital signature. This digital signature can be broadcast to the cryptocurrency network together with the transaction, and other nodes can verify the validity of the digital signature with your public key to ensure the legality of the transaction.

It should be noted that wallet signature can only be used for transaction verification, not for recovering private keys or other sensitive information. The private key is the key to generate a digital signature, which must be kept secret and cannot be revealed. The public key and signature are public and can be verified by tools such as blockchain browser.