Generate challenge message for Solana wallet-based authentication with nonce and timestamp
Client Key used to uniquely identify the client
"dk_gyh2eqzfkc4mhp5eiahnndkz"
User wallet address
"6CxnSjtasq5Tzwb4b93AhLofXtiDvMpQ2vTkWdSZqTH7"
Challenge message generated
Message to be signed by the user
"Sign this message to authenticate. Nonce: 1638471298347"