IMPORTANT: some wallets such as exchange accounts do not have the ability to sign a message. Make sure that you are able to sign a message with your wallet before locking your payout setup, otherwise we will not be able to verify you using this method.
Cryptocurrency wallets each have a public and private key pair that enables the wallet’s owner to securely verify their own transactions. The private key is used to digitally sign messages or other data packets such as Bitcoin transactions, verifying that the data has not been tampered with and that it’s authentic (coming from the owner of the wallet). Therefore, providing a digital signature created by your wallet’s private key is a good way to verify that you own a mining account associated with that wallet.
For more details on how wallet signatures work, see public key cryptography.