gs-eth

Getting started with Ethereum

agenda:

• Some interesting reading to start with
• Installation (docker based)
• Your first contract (based on ethereum tutorials)
• Refactor it with truffle
• Implement the two last tutorials of ethereum

Documentation

The white page Ethereum Homestead Documentation Go Etherum Wiki Solidity Documentation

Installation

The CLI

Ethereum implementation in Go

Standalone installation

brew update
brew upgrade
brew tap ethereum/ethereum
brew install ethereum

This is an extract from the documentation

As an alternative look to Browser Solidity

Docker based Installation

Everything here

Get images with geth client in Golang:

docker pull ethereum/client-go:alpine

Start node in dev mode

Start node in dev mode using geth client with RPC: //TOOD add rpc explanation

docker run -d --name eth-dev-node -p 8545:8545 -p 30303:30303 ethereum/client-go:alpine --dev --rpc

Attach to running node

docker exec -it eth-dev-node ./geth attach ipc:/tmp/ethereum_dev_mode/geth.ipc

Create account

In the geth console execute:

• eth.accounts should display [] meaning no accounts
• personal.newAccount('A_PASSWORD') where you choose the value for A_PASSWORD. This should output the address of this account.
• eth.accounts or personal.listAccounts
• eth.getBalance(SOME_ADDRESS) where SOME_ADDRESS is one of an account. Should display 0 for the moment since you have to mine to get some ehter.

Start mining

Set mining beneficiary account:

• miner.setEtherbase(SOME_ADDRESS) where SOME_ADDRESS is the one of your account.
• eth.coinbase will display the address of the account which will be credited while mining.

Start mining:

• miner.start() to start mining. Since in dev-mode you run a private network you will mine easily and so getting faster ether. Note that miner.start() have an optional parameter to indicate number of threads used for mining.

Wait for a minute then miner.stop(). You can now check the balance.

Create your first contract

First contract

Greeter contract

Using Solidity web ui

Solidity web

A dev environment

npm install -g truffle

The private net

Follow the steps from here

--datadir "./.ethereum-private" --genesis CustomGenesis.json --nodiscover --maxpeers 0

Questions

• qwei?
• no gas is paid to execute a contract

Useful links

https://github.com/ethereum/go-ethereum/wiki/Command-Line-Options https://github.com/ethereum/go-ethereum/wiki/geth https://github.com/ethereum/go-ethereum/wiki/JavaScript-Console

https://ethereum.gitbooks.io/frontier-guide/content/getting_a_client.html https://souptacular.gitbooks.io/ethereum-tutorials-and-tips-by-hudson/content/private-chain.html

https://github.com/ConsenSys/truffle

https://ipfs.io/ https://golem.network/

http://blogchaincafe.com/les-consensus-proof-of-work-vs-proof-of-stake