This document provides information about Kenneth Hu and his background as a software developer with over 11 years of experience. It also includes details about various Ethereum topics like different types of decentralized applications (dapps), Ethereum clients, smart contract development tools like Solidity, Truffle and Embark, and how to use MetaMask and get testnet coins. The document serves to introduce attendees to Kenneth's blockchain and Ethereum meetup and provide an overview of the material that will be covered.

1. 2017/11/28
Kenneth Hu (full stack developer)
Kenneth.hu@Hotmail.com

2.  I am a software developer for 11+ years
 I am developer , not trader.
 I am enthusiast, not expert.
 Blockchain, AR, ChatBot
 Email: Kenneth.hu@Hotmail.com
 Founder of Blockchain&Dapps meetup
 Founder of Singapore IOTA meetup

4. Ivan Kukanov

9.  Pure DApp:
IPFS/Swarm/AWS/GCE
Client
(Web, mobile)
Miner
Ethereum Network

10. Server API
 Sibling DApp:
Miner
Ethereum Network
Client
(Web, mobile)
IPFS/Swarm/AWS/GCE Internet

11.  Protected DApp:
Server API
Miner
Ethereum Network
Client
(Web, mobile)
IPFS/Swarm/AWS/GCE
Internet

12.  Write Solidity Code
 Deploy Solidity code to Ethereum
 Write front end code (Web, IOS, Android)

14.  High level languages
 Solidity
 Serpent
 Lisp Like Lanaguage
 Development management tools
 Truffle Mist
 Embark Geth
 Dapple Parity
 MetaMask Web3.js
 Testnode with RPC interface ( remote procedure call (RPC) protocol)
 Javascript testprc
 Python testnode

15. KOVAN
Ethereum Wallet
RINKEBY
Mainnet
ROPSTEN

16. Network Network ID Note
Main 1
Morden 2 deprecated
ropsten 3
Rinkeby 4
Kovan 42

17. Client Language Developers
go-ethereum Go Ethereum Foundation
Parity Rust Ethcore
cpp-ethereum C++ Ethereum Foundation
pyethapp Python Ethereum Foundation
ethereumjs-lib Javascript Ethereum Foundation
Ethereum(J) Java <ether.camp>
ruby-ethereum Ruby Jan Xie
ethereumH Haskell BlockApps
http://ethdocs.org/en/latest/ethereum-clients/choosing-a-client.html#why-are-there-multiple-ethereum-clients

18. |Namespace Usage
Admin Geth node management
Debug Geth node debugging
Personal Account management
Txpool Transaction pool inspection
Net
web3

19.  >geth [options] command [command options] [args…]
 Testnet
 Geth –testnet Rinkeby
 TestRPC
 Geth attach http://localhost:8545
 Command practice
 Personal.listAccounts
 eth.getBalance(personal.listAccounts[0])
 Eth.syncing

https://github.com/ethereum/go-ethereum/wiki/Command-Line-Options

21.  How to use METAMASK
 Create Account
 Import Accounts
 Private key
 JSON File
 Network
 Get Testcoin from testnet

22.  Transfer ether
 Types of wallet accounts
 Single owner & MultiSig contract account

23.  Has an address
 Private key protected by password
 Has an address but NO private key
 Hold/Run code
 Associated with accounts(s)
 Lists incoming transactions
Account
Contract Account

24.  One Account creates & owns
 One Account creates
 Multiple owners
 M-of-N type wallets
 N = Number of owners
 M = Required to confirm transaction
Single Owner
Contract Account

25. MultiSig
Contract
Daily limit : 2
Sig required : 2
Kenneth
Alice
Creates Import Contract
Send 2 Ethers Send 2 Ethers
Send 3 Ethers to Ivan Prompts
Approves
Transfer 3 Ethers

26.  Smart contract = Token = crypto currency
 ERC20 : It is a specification standard for tokens
 Buy tokens with Ethers
 Check the balance of tokens
 Transfer tokens to others
{Address of contract}

29. REMIX
Blockchain
 IDE – Remix
 Library – Web3.js
 Dapp browsers– MetaMask
 Smart Contract Language - Solidity
 Simulator - testRPC
 ChainCode– go-ethereum/Geth

30.  Command : testrpc

31.  Ethereum : Value token

32.  User invoking the transaction pays for the execution.
 Measures : kWH used Measures : Gallions of water used
 Gas is the unit in which EVM resource usage is measured.

33. Library Language
Web3.js JavaScript
web3J Java
Nethereum C# .NET
Ethereum-ruby Ruby
http://ethdocs.org/en/latest/connecting-to-
clients/index.html?highlight=Connecting%20to%20Ethereum%20Clients

34.  Remix is a suite of tools to interact with the Ethereum blockchain in order to debug
transactions, stored in this Git repository.
 How to use remix with MetaMAsk
 How to compile smart contract
 How to call functions of smart contract

36.  Join the discussion with us!!
 WebSite : http://sgblockchain.sg/
 FaceBook : https://www.facebook.com/groups/140517386608407
 linkedin : https://www.linkedin.com/groups/10359719
 Slack : https://goo.gl/iXLFi8
 Meetup : https://www.meetup.com/BlockChain-Dapps-Technology/
 Share anything with us!!
 https://github.com/EtherSingapore/talks
 Dapps Demo site :
 WebSite : http://www.kennethhu.net/example/ethereum/index.html
 Video : https://youtu.be/9dWxJcLajGY
 Github : https://github.com/kennethhutw/Ethereum-Dapps

37. Please write your feedback
for this workshop on my
meetup. Thanks
Kenneth