Polkawallet is also a mobile wallet. Currently, it can be downloaded on iOS or Android. After downloading, the user records the private key of the memorial hall. Unlike the Parity Signer wallet, the Polkawallet is a networked hot wallet, but the Polkawallet will also confirm the transaction signature offline when the private key is cold-stored, the private key will not be exposed to the network connection, and the Polkawallet supports the recovery function. You can set up several real friend accounts in the account. If your private key is accidentally lost, your friends can jointly prove that this is your account reply permission.