MetaMask Gate-In

Allows MetaMask users to sign a text from a multiplayer server to prove their identity without needing native code in the Unity3D project or exposing private key. The concept is to avoid native code in Unity that are often a majors issue to deal with on a rainbow of situation possible, while allowing to use the power of asymmetric cryptography and Ethereum.

• Server sends a message to sign to the Unity client.
• Unity client opens a browser on a static JavaScript page on GitHub.
• The page contacts MetaMask, requesting to sign the message.
• The message, public address, and the signed message are concatenated in the clipboard.
• By coming back to the Unity application, the proof of his identity from the GUID is sent to the server.
• The server uses a local validation tool to validate that the message is signed by the user.
• It sends back a message to the player that it was validated or refused.

And like that, we have a server that can identify an anonymous player in a tournament based on his public key without risking the user accidentally exposing his private key.