Introduction

It was incredibly stressful to get it right; it took months of building, weeks of user testing, and days of pacing food trucks. The Burner Wallet at ETHDenver was straight up 🔥 AF.

Image from Rich@Maker

There were 11 food trucks that sold a total of 4405 meals over the course of the weekend. Here is an example of a meal being purchased. Notice the transaction cost of $0.000046 USD? That means for all of the transactions for all of the meals the cost of running the wallet on xDai was $0.20!!! That’s pretty good for a total of $38,432.56 being paid in DAI to the trucks:

(not all truck off-ramps pictured here)

That isn’t even the best part! The key here is that it was so easy to use that the user adoption rate was through the roof…

User Flow

Let’s start from the perspective of a developer or participant in ETHDenver. They arrived at the Denver Sports Castle early Friday morning with excitement to #buidl the next big thing in Ethereum. At the front desk they received a swag bag with goodies and a SolidCoin:

This SolidCoin had an Ethereum private key in the form of a QR code on the back. An attendee could pull out their phone’s camera and point it at the QR to seed a wallet:

One quick scan and they had a wallet with money in it. No app download, no seed phrases, instant onboarding into crypto.

Image from Rich@Maker

From there the participant could approach a food truck, order their meal, and scan a QR code to purchase it:

Five seconds later, the purchase is displayed on the food truck’s iPad and they hand you your food:

Participants, sponsors, and vendors could also move funds between themselves to purchase items other than food:

We were super busy so we weren’t able to execute on collectibles as well as I wanted, but they are in the wallet and you should look for them at the next Burner event:

Food Truck Flow

Okay, now from the perspective of a food truck. We asked all eleven food trucks to sign up for a Wyre account before arriving Friday morning. When they showed up we used their iPad to scan a special vendor private key. Then we printed a QR code for them to display at their truck: