Viral Saving Game

Try to save DAI 9.90 every week for one year. Earn more interest by inviting friends. If you drop out in the middle you lose your interest and it is distributed to everyone who make it to the end.

Referral system

The game makes saving viral.

Each friend you refer gives you 10% of their interest
Each friend of a friend gives you 1% of their interest

How does it work

Any deposited DAI is converted to interest earning aDAI on Aave Protocol
All interested is hold by the viral bank smart contract
Interested is distributed to the players who make it at the end of the game
You get extra interest bonus for friend referrals who you brought to the game
Any players who drop out in the middle of game lose their interest and it is distributed to the players who make it to the end

Smart contract usage

Starting the game as a player

You need to have a referral from somebody to get in the game on the first round.

User needs to do the following to start the game

Have 9.90 DAI balance in their wallet
Have referring player address
approve() the ViralBank contract for DAI token transfers
Do a transaction to startGame()

Playing the game

One week is one round.

Every week the user has to

Have 9.90 DAI in their wallet
Do a transaction to buyInToRound()

Status and stats

getGameState() tells you what is the current state of the game
getPlayerState(address) tells if an address is playing, dropped out or successfully finished the game
getTotalAccuredInterest() tells the total DAI prize pot at the moment

Wallet integration

There is vDAI faux ERC-20 token.

Add ViralBank address as a token in your wallet
Token balance shows your accrued interest balance

Frontend

Frontend is a different repo.

Internals

Based on Drizzle box.

Developing

Install Truffle.

npm install -g truffle

Install Ganache for having a local dev Ethereum network.

npm install -g ganache ganache-cli

Compile contracts

truffle compile

This will pull Solidity compiled 0.5 from DockerHub and compile the smart contracts using Dockerized compiler.

Start dev env in one terminal

truffle develop

Then install and start the React app.

cd app
npm start

Deployment

First setup .env file:

KOVAN_MNEMONIC="xxx yyy"
KOVAN_PROVIDER_URL=https://kovan.infura.io/v3/your_key

MAINNET_MNEMONIC="xxx yyy"
MAINNET_PROVIDER_URL=https://mainnet.infura.io/v3/your_key
MAINNET_GAS_PRICE=3000000000

# you can get this from etherscan website
ETHERSCAN_API_KEY=your_key

To deploy and verify the code

$ npx truffle --network kovan exec scripts/deploy.js
Using network 'kovan'.

network:  kovan
ViralBank.new: started
ViralBank.new: done, gas used 0x2713e2, gas price 20 Gwei
bank address 0x9Eb6a33451643A564049f6D65b077E3308717b54
$ npx truffle run --network kovan etherscan ViralBank@0x9Eb6a33451643A564049f6D65b077E3308717b54
Verifying ViralBank@0x9Eb6a33451643A564049f6D65b077E3308717b54
Pass - Verified: https://kovan.etherscan.io/address/0x9Eb6a33451643A564049f6D65b077E3308717b54#contracts
Successfully verified 1 contract(s).

Mint test tokens

master $ npx truffle --network kovan exec scripts/mint-tokens.js
Using network 'kovan'.

network:  kovan
token.mint 100: started
token.mint 100: done, gas used 50436, gas price 20 Gwei

Addresses

Kovan

DAI: https://kovan.etherscan.io/address/0xFf795577d9AC8bD7D90Ee22b6C1703490b6512FD
aDAI: https://kovan.etherscan.io/address/0x58AD4cB396411B691A9AAb6F74545b2C5217FE6a
ViralBank: https://kovan.etherscan.io/address/0x9Eb6a33451643A564049f6D65b077E3308717b54#code
Patient 0: 0xd66E40b0c30595bEc72153B502aC1E0c4785991B

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