LamboAuth is a script that checks whether you're the owner of an EtherLambo or not. Here's how it works:

• First you're asked to sign a message with your current MetaMask address to prove you're the owner of that address.
• Next all of the EtherLambos are fetched from the contract.
• Finally your current MetaMask address is compared to all of the EtherLambos.

You can find a live demo of LamboAuth at https://lamboauth.eldc.co/.