Ethereum Developer Certification

This is an excerpt from my final exam of the Ethereum Developer Course by B9lab that led to my Ethereum Developer certification.

Final project: Toll Road System

..without revealing too much (by B9lab):

Our project describes a road system that will be represented by 2 overarching smart contracts:

• Regulator
• TollBoothOperator

These other elements of the system are represented by externally owned accounts:

• owner of Regulator
• owner of TollBoothOperator
• individual vehicles
• individual toll booths

There were many more requirements e.g. how route prices are calculated, how external accounts (vehicles, toll booths, operator) are handled and how specific scenarios need to play out. All interfaces were defined by B9lab beforehand.

I had to fill the contracts with code and bring the dApp to life which also needed to be tested thoroughly with a full test routine (see example in /test). A simple GUI should also be created which you can see below.

My developed application 'TollRoadApp'

Tech stack

• truffle
• ganache
• web3.js
• react
• chakra-ui
• ..served out of a vagrant box
• see also package.json

Regulator

• can register new vehicles and
• can allow new operators

Operator

• has an simple overview of its contract and TVL information
• can add new booths as a toll road operator and
• can set/modify route prices

Vehicle/driver

• can create a secret locally
• can enter the toll road with an entry fee
• can inspect its history

Booth

• can report a vehicles exit
• can inspect pending and normal exits

Credits

• TollRoad icon designed by Smashicons from Flaticon
• Wouldn't have made it without the brilliant docs from https://github.com/chakra-ui/chakra-ui (@chakra-ui/react)