Blockchain Architecture

What is Blockchain?: A record of keeping systems - Trust - Decentralization - Trustless environment

How does Blockchain work?: Announcements - Blocks - Nodes - Chaining - Verification - Consensus - Scalability - Privacy - Crypto hashing - Digital fingerprinting - PoW versus PoS

Blockchain Types: Public versus private - Open versus closed - Smart contracts - Blockchain as history - Tokens/coins - Gas

How is Blockchain different from what we have today?: Decentralization - Peer-to-peer architecture - Software versus firmware - Database versus Blockchain - Distributed database or other technology? - Data sovereignty - Group consensus

Blockchain Use Cases: Use case examples - Currency - Banking - Voting - Medical records - Supply chain/value chain - Content distribution - Verification of software updates - Law enforcement - Title and ownership - records - Social media and online credibility - Fractional asset ownership - Cable television billing - High fault tolerance - Public or private Blockchain? - Who are the participants?

What does a Blockchain app look like?: DApp - Resembles typical full stack web application - Any internal state changes and all transactions are written to the Blockchain - Node.js - IDE - Public Blockchain visibility - Private Blockchain solutions - Oracles

How do I design a Blockchain app?: What does the solution need to let users do? - Will the proposed solution reduce or remove the problems and pain points felt by users? - What should this solution prevent users from doing? - Do you need a solution ready for heavy use on day 1? - Is your solution idea enhanced by the use of Blockchain? - Does the use of Blockchain create a better end-user experience and how? - Has your business developed custom software solutions before? - What level of support are you going to need? - How big is the developer community? - Does your vision of the future align with the project or platform’s vision of the future?

Does the platform aim to make new and significant contributions to the development space, or is it an efficiency/cost play? - Should the solution be a public or private Blockchain? - Should the solution be an open or closed Blockchain? - Create a plan for contract updates and changes - Hybrid solutions - Monetary exchanges?Lesson 8How do I develop a Blockchain app? - Agile approach pre-release - Define guiding principles up front

Software versus firmware - Announcements, not transactions! - Classes, not contracts - Link contracts to share functions - Use calling contracts to keep contract addresses the same - Hyperledger versus Ethereum - Consider the number of users and number of transactions per user - Should a blockless solution be applied? - Performance - Security - Anonymity - Monolithic versus modular - Sandwich complexity model

How do I test a Blockchain app?: Recommendations - Security - Networks (Ethereum)