cryptothon

Cryptocurrency hack-a-thon-o-rama weekend project.

Goal

Make an Ethereum Dapp written in Solidity.

Quickstart

# 1. install truffle cli
npm install -g truffle
# 2. start truffle develop ethereum client
truffle develop
# 3. in a new console: compile Dapp
truffle compile
# 4. deploy migration
truffle migrate --reset --network development

Ethereum Clients

In addition to truffle develop there are other options for Ethereum Clients both development and real:

Ganache

# stand alone local test client
docker run --rm -it -p 8545:8545 trufflesuite/ganache-cli

Ethereum Testnet:

Docker

# Note you could also use --rinkeby instead of --testnet (ropsten?)

# This will persist your configuration in ~/.ethereum (might need to set permissions properly)
# https://github.com/ethereum/go-ethereum#full-node-on-the-ethereum-test-network
# Setup a new account
docker run --rm -it \
           -v "$HOME":/root \
           ethereum/client-go:stable \
           --rinkeby account new
# Connect a console
docker run --rm -it \
           -v "$HOME":/root \
           -p 8080:8080 \
           -p 8545:8545 \
           -p 8546:8546 \
           -p 30303:30303 \
           -p 30304:30304 \
           ethereum/client-go:stable \
           --rinkeby \
           --fast \
           --cache=512 \
           --rpc \
           --rpcaddr localhost \
           --rpcport 8545 \
           --rpccorsdomain "*" \
           --ws \
           --wsport 8546 \
           --wsorigins "*" \
           --rpcapi eth,net,web3,personal \
           console
# <cntrl-d> to exit
# some commands:
> net.listening
> net.peerCount
> admin.peers
> admin.nodeInfo
> eth.accounts # list accounts
> eth # all eth commands
> web3 # all web3 commands
> personal # all personal commands
> personal.unlockAccount(eth.accounts[0]) # unlock 1st account
> web3.personal.unlockAccount(web3.personal.listAccounts[0]) # unlock web3 account
> eth.getBalance(eth.coinbase) # get balance in Ethercoin

Geth & Rinkeby

# Create a new account
geth --rinkeby account new

# Start a Rinkeby client
geth --rinkeby --fast --cache=1024 --rpc --rpcapi eth,net,web3,personal

# Attach a console to the client
geth --datadir=$HOME/.ethereum/rinkeby attach ipc:$HOME/.ethereum/rinkeby/geth.ipc console

Ethereum Real Network:

# just remove --testnet or --rinkeby from previous command

Currency Units

1: wei (smallest atomic unit of currency)
10^3: (Kwei (kilowei))
10^6: (Mwei (megawei))
10^9: (Gwei (gigawei))
10^12: szabo
10^15: finney
10^18: ether

10^18 wei = 1 ether

MoneyMoneyMoneyMoney

truffle migrate -f 2 --network rinkeby
Copy abi from ./build/contracts/Money.json
Get rid of the newlines and new paragraphs using this tool
On your geth console:
- var abi = <your abi string>
- var money_contract = web3.eth.contract(abi)
- var money_inst = money_contract.at('<contract addr>')

Web

cd web
yarn install npm install --save
npm start

ubergarm/cryptothon