Ethereum Jam

Let's have fun with Ethereum

Ethereum

The world's computer!

Your weapons

• Blockchain
• Ether (GAS)
• Solidity (smart contract)
• Whisper
• IPFS
• Any browser framework
• your creativity

Smart contract

- Your game rules

- Your game state

- Account management out of the box

- Easy to implement "accounting system" (for money, points ...)

contract MyGame is Game{
    function attack(uint army_size, address opponent)
    {
        if(hasEnoughArmy(sender)){
            attackOpponentWithArmy(sender, opponent,army_size);
        }
    }

    function attackOpponentWithArmy(address me, address opponent, uint army_size){
        //do something here
    }
}

Dev libs and tools

- Whisper PubSub protocol

- Web3 javascript lib

- test RPC

- ethereumjs-tx

- truffle

- IPFS (and the client lib)

- Game Engine / Framework

Ether camp

- Your Ethereum provider

- IDE

- transaction explorer / debugger

- contract explorer / debugger

Ether.camp DEMO

Useful links

• https://github.com/ethereum/wiki/wiki
• test.ether.camp
• www.ether.camp
• https://ether-camp-friends.slack.com
• https://github.com/ConsenSys/truffle
• https://github.com/ethereumjs/testrpc
• https://ipfs.io/

Hackathon

• In the browser
• Multiplayer
• Ethereum to take care of your state

Basic principles

• NameReg and blockchain immutability
• How to call a contract from JavaScript
• Difference between a call and a transaction
• read / write separation
• smart contract logging
• transaction synchronization
• questions?

Roundtable

Brainstorming!

Let's hack!