Message signature is implemented by encrypting the message with a private key, it allows users to verify the owner of an address. You can set a message signature on ViaWallet through the following tutorial, and others can verify whether the address belongs to you through your signed message.
Step 1: Currently, multiple cryptos are supported to use this feature, here we take CET as an example. Choose CET from the asset list to enter the crypto page
Step 2: Check more features of the crypto by tapping "More"
Step 3: Choose "Message Signature"
Step 4: Enter a message you want to sign and tap the "Submit" button
Step 5: Enter the password for security verification, then the message signature will be generated. Copy the corresponding message to others to verify that the address belongs to you