1. BlockChain Technology

2. Kenneth Hu
A full stack web developer

3. a very special kind of Distributed Database
What is blockchain?
 a very special kind of Distributed Database
共同体区块链/ 共同體區塊鏈：（Consortium blockchains）.
协作区块链(federated blockchain) 例子：Hyperledger以及德勤等会计所尝试的审计系统。
. Blockchains are a technology for shared databases. So you need to start by knowing why you are using a database

4. Avoidable Blockchain Mistakes
Misunderstanding or ignoring the purpose of blockchain technology
Assuming that current technology is ready for production use
Viewing blockchain technology purely as a database or storage mechanism
Assuming interoperability among ledgers and platforms that don’t exist yet
Assuming that today’s leading platforms will still be dominant (or even extant) tomorrow
Assuming that smart contract technology is a solved problem
Failure to incorporate a learning process

6. Decentralized Applications

7. Summary Front-end may be developed in any language
Connects directly to the blockchain network
Invokes contracts functions
User pay a small fee; Mine rewarded
Data Stored in the contracts on the Ethereum network
Data managed in contracts; state changes
Contract generates events
Transactions recorded on chain

8. Next step How do I install Blockchain?
What query language is used for Blockcahain?
How do I CURD Blockchain?
How do I architect a Blockchain application?
Do you want or need this disintermediation?
 if your project does not fulfill every single one of these conditions, you should not be using a blockchain. In the absence of any of the first five, you should consider one of: (a) regular file storage, (b) a centralized database, (c) master–slave database replication, or (d) multiple databases to which users can subscribe.

9. Q: Which should I use?

10. Distributed ledger and Decentralized system
Decentralized system for exchange of value.
Uses a shared distributed ledger.
Transaction immutability achieved by way of blocks & chaining
Leverage consensus mechanism for validating the transaction.

11. Blockchain Bitcoin Hyperledger Ethereum Everledger Quorum Chain
Smart Contract
Everledger
Quorum
Chain
BigChainDB
MutileChain
Chain -

15. Hyperledger Composer and Hyperledger Fabric

16. Typical Solution Architecture

17. Architecture

18. Prerequisites Hyperledger fabric Hyperledger composer Smart contract
Chaincode (run in Docker container)
Go language (ready)
Java (planned)
NodeJS (planned)
Environment
Docker
Vagrant
Distributed Ledger
RocksDB
Kafka
Hyperledger composer
REST API
JSON
Javascript
Npm
Copmoser Query Langauge
NodeJS
Node-RED
Yeoman 
Angular

20. Practice hyperledger composer Kafka-based Ordering Service
Installing hyperledger composer
Developing Business Networks
Developing Applications
Hyperledger fabric
Building your First Network
Writing Your First Application
Chaincode Tutorials
Chaincode for Developers
Chaincode for Operators
Kafka-based Ordering Service

21. ledger
Data added to the ledger CANNOT be Updated Or Deleted (Q: how to manger the chain)
Anyone can validate the transaction with ower’s public key (How to do)

22. Case study

26. Prerequisites
C++

27. Ethereum

28. Smart contract How write smart contract.
How to deploy a smart contract to test blockchain
How to interact with smart contract

29. Prerequisites
Computing language
Solidity
Geth

30. Smart contract – computer code write in multiple languages
Contract lives on the network
Enforces rules
Performs negotiated action.
1.Send Ethers
3. Widget shipped
4. Widget received
第三方托管（ESCROW）
Seller
Buyer
2.Holds Ethers In escrow
5. Release funds to seller

31. Gas
User invoking the transaction pays for the execution.

32. INFURA
Online INFURA

33. Zeppelin-solidity A Framework to build Secure Smart Contracts
- common contract security patterns
In the Solidity language

34. Ethereum Dev Build Ethereum private chain
Run node and connected each other
Familiar geth javascript console
Build accounts , transactions and check block
Run private chain miner
RPC protocol usage and connection
Ethereum Block explorer
Smart Contract on Ethereum
Mist
Solidity
Dapp programming

37. The Architecture of Decentralized Apps and Smart Contracts
When put smart contract into blockchain, how to CRUD

38. Smart contracts.
 If you think about a legal contract or a business agreement, it’s essentially a series of “if, then” statements.

39. Ethereum - Smart contract
The smart contract code is stored in ledger (blockchain?). Transactions can invoke smart contract function , which can be stateless or stateful, to perform business logic. If the code can access external information and system, via the system integration component.

41. Practice Install Ethereum- client Write smart contract by solidity
Compiler the smart contract by solidity compiler
Deploy smart contract in the blockchain by web3.js

42. solidity Documentation Git : https://github.com/ethereum/solidity
web3.js : management.html#keyfiles
Open source tools
geth (version 1.5.9): CLI for running ethereum node
brew: package manager for MacOS.

43. Truffle + Testrpc Truffle Testrpc
Testrpc

44. Ethereum-Development
build Ethereum private chain
Connected between the nodes.
Familiar with geth javascript console
Create accounts, transactions, check block
Operate private chain miner
How to use RPC protocol
Smart Contract on Ethereum
Mist
Solidity
Dapp (Distributed Application) programming

45. Decentralized application

46. INFURA INFURA is Scalable Blockchain Infrastructure
Office websit :
Running Mist with INFURA

48. Web App -> DAPP

49. BigChainDB – A Scalable Blockchain Database
Language
Python
NodeJS
Environment
BigChainDB Server
Everledger | A Digital Global Ledger
BigchainDB supports both public and private deployments.

52. decentralized storage (e.g. IPFS)
decentralized processing (“smart contracts”)
 Decentralized storage (ledgers, file systems, databases)
Decentralized computing platforms (“blockchain platforms”)

53. MultiChain Language C# Python Java Javascript PHP Ruby

54. MultiChain Explorer – web-based browsing of blockchain activity.
MultiChain Web Demo – simple web interface for many APIs.
C# MultiChainLib – C# wrapper for the MultiChain API by PBJ Cloud.
MultiChainJavaAPI – Java wrapper for the MultiChain API by Worldline.
MultiChain-Node – Javascript wrapper for the MultiChain API by Greg Piccolo.
libphp-multichain – PHP wrapper for the MultiChain API by Kunstmaan Labs.
Savoir – Python wrapper for the MultiChain API by DXMarkets.
multichain-client – Ruby wrapper for the MultiChain API by The Open Data Institute.
docker-multichain – Docker images for a simple 3-node MultiChain setup by Kunstmaan Labs.
YobiChain – a private blockchain ecosystem preloaded with MultiChain and related tools.