thenikso / b-bet

Ivan on tech academy - Ethereum Smart Contract Programming 201 - assignment

B-Bet smart contract study project

This is my take on Ethereum Smart Contract Programming 201 assignment of creating a smart contract and dapp to bet on a coin flip.

This project also contains a (naive) oracle implemented in node to provide random numbers to the blockchain.

Local setup

Install dependencies using yarn install in the project's root. npm install should work the same.

Contract setup

1. Have Ganache up an running
2. Run yarn migrate --reset to deploy the contract on the local Ganache network

Wallet setup

1. Install Metamask or enable Brave wallet
2. In the wallet network selection use "Custom RPC" to add a new network, name it "Ganache" and copy the RPC network address from Ganache interface (usually http://127.0.0.1:7545)
3. In the wallet accounts, select "import account" and use one of the Ganache generated private address

Oracle setup

1. From Ganache get the private key of the account with index 3 (:warning: only use local, test only key that you can expose)
2. From Ganache get the Oracle deployed contract address
3. Run the oracle with

   node oracle.js -a <private_key_index_3> -c <oracle_contract_address>
   

4. The oracle should now be listening to the blockchain, use ctrl-C twice to quit

Dapp setup

1. Run yarn dev to start the dapp local server
2. Navigate to http://localhost:8080/ and you should see the dapp

Dapp usage

1. Click the "Connect to Wallet" button at the top right, you should be presented with Metamask connection interface; accept the connection
2. Add a sum to bet in the input field
3. Click on "Place bet"