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BLOCKCHAIN TECHNICAL
Featured Review
4.5 (1997 Ratings)
A blockchain is a digitized, decentralized, public ledger of all cryptocurrency transactions. Constantly growing as ‘completed’ blocks (the most recent transactions) are recorded and added to it in chronological order, it allows market participants to keep track of digital currency transactions without central recordkeeping. Each node (a computer connected to the network) gets a copy of the blockchain, which is downloaded automatically.
Overview
The Syllabus
Curriculum Designed by Experts
Lesson 1: Welcome To Blockchain
- What is a Blockchain?
- Making Your First Transaction
- How Do Blockchains Work?
- Consensus
Lesson 2: Welcome to Remix! Simple Storage
Basic Solidity
Versioning
Compiling
Contract Declaration
Types & Declaring Variables
uint256, int256, bool, string, address, bytes32
Default Initializations
Comments
Functions
Deploying a Contract
Calling a public state-changing Function
Visibility
Scope
View & Pure Functions
Structs
Intro to Storage
Arrays – Dynamic & Fixed sized
Compiler Errors and Warnings
Memory
Mappings
SPDX License
Deploying to a “Live” network
A testnet or mainnet
Find a faucet here
Connecting Metamask
Interacting with Deployed Contracts
The EVM
Lesson 3: Storage Factory
Inheritance, Factory Pattern, and Interacting with External Contracts
- Factory Pattern
- Imports
- Deploy a Contract From a Contract
- Interact With a Deployed Contract
Lesson 4: Fund Me
Payable, msg.sender, msg.value, Units of Measure
Payable
Wei/Gwei/Eth Converter
msg.sender & msg.value
Chainlink Oracles
Decentralized Oracle Network Chainlink
Blockchains can’t make API calls
Centralized Nodes are Points of Failure
data.chain.link
Getting External Data with Chainlink Oracles
Chainlink
Faucets and Contract Addresses
Kovan
Getting Price Information
Importing from NPM and Advanced Solidity
Decimals/Floating Point Numbers in Solidity
latestRoundData
Importing from NPM in Remix
Interfaces
Introduction to ABIs
Getting Price Feed Addresses
getPrice
Tuples
Unused Tuple Variables
Matching Units (WEI/GWEI/ETH)
getConversionRate
Matching Units (Continued)
SafeMath & Integer Overflow
using keyword
Libraries
SafeMath PSA
Setting a Threshold
Require
Revert
Withdraw Function
Transfer
Balance
this
Contract Owners
Constructor
==
Modifiers
Resetting
for loop
Array Length
Forcing a Transaction
Recap
Lesson 5: Web3.py Simple Storage
Installing VSCode, Python, and Web3
VSCode
VSCode Crash Course
Extensions
Short Cuts:
VSCode Shortcuts
VSCode MacOS Shortcuts
Python
Install Troubleshooting
Terminal
Making a directory/Folder
Opening the folder up with VSCode
Creating a new file
Syntax Highlights
Remember to save!
Setting linting compile version
VSCode Solidity Settings
Formatting & Format on Save
Solidity Prettier
Python Black
pip
Python Script with Web3.py – Deploying a Contract
Reading our solidity file
Running a Python Script in the Terminal
MaxOS Shortcuts
Windows Shortcuts
Linux Shortcuts
Compiling in Python
py-solc-x
compile_standard
Colorized Brackets
JSON ABI
Saving Compiled Code
Formatting JSON
Deploying in Python
Get Bytecode
Get ABI
Choose Blockchain to Deploy To
Local Ganache Chain
Ganache UI
Ganache Command Line
Web3.py
HTTP / RPC Provider
Private Keys MUST start with “0x”
Contract Object
Building a Transaction
Account Nonce
Calling “Contructor”
Transaction Parameters
Signing the Transaction
NEVER put your private key directly in your code
Setting Environment Variables (Windows, Linux, MacOS)
More on Windows Environment Variables
Exported Environment Variables Only Last the Duration of the Shell/Terminal
Private Key PSA
.env file
.gitignore
Loading .env File in Python
python-dotenv
Viewing our Transaction / Deployment in Ganache
Waiting for Block Confirmations
Interacting with Our Contract in Python & Web3.py
2 Things you always need
Contract Address
Contract ABI
Getting address from transaction receipt
Calling a view function with web3.py
Call vs Transact
Updating State with Web3.py
ganache-cli
Installing Ganache
Install Nodejs
Install Yarn
Working with ganache-cli
Open a new terminal in the same window
Deploying to a testnet
Infura
Alchemy
Using Infura RPC URL / HTTP Provider
Chain Ids
Lesson 6: Brownie Simple Storage
Brownie Introduction
Installing Brownie
Installing Brownie
Install pipx
pipx install eth-brownie
Testing Successful Install
Brownie Simple Storage Project
A new Brownie project with brownie init
Project Basic Explanation
Adding SimpleStorage.sol to the contracts folder
Compiling with brownie compile
Brownie deploy script
def main is brownie’s entry point
brownie defaults to a development ganache chain that it creates
Placing functions outside of the main function
brownie accounts
3 Ways to Add Accounts
accounts[0]: Brownie’s “default” ganache accounts
Only works for local ganache
accounts.load(“…”): Brownie’s encrypted command line (MOST SECURE)
Run brownie accounts new <name> and enter your private key and a password
accounts.add(config[“wallets”][“from_key”]): Storing Private Keys as an environment variable, and pulling from our brownie-config.yaml
You’ll need to add dotenv: .env to your brownie-config.yaml and have a .env file
Importing a Contract
Contract.Deploy
View Function Call in Brownie
State-Changing Function Call in Brownie / Contract Interaction
transaction.wait(1)
Testing Basics
test_simple_storage.py
Arrange, Act, Assert
assert
brownie test
test_updating_storage
Pytest / Brownie Test Tips
Deploy to a Testnet
brownie networks list
Development vs Ethereum
Development is temporary
Ethereum networks persist
RPC URL / HTTP Provider in Brownie
The network flag
list index out of range
get_account()
networks.show_active()
build/deployments
Accessing previous deployments
Interacting with contracts deployed in our brownie project
Lesson 7: Brownie Fund Me
Introduction
Setup
Dependencies, Deploying, and Networks
Dependencies
chainlink-brownie-contracts
remappings
Deploy Script (V1)
helpful_scripts.py
__init__.py
Deploy to Rinkeby
Contract Verification (publish_source)
The Manual Way
“Flattening”
The Programatic Way
Getting an Etherscan API Key
ETHERSCAN_TOKEN
Interacting with Etherscan
Deploying to Local Chains
Introduction to Mocking
Constructor Parameters
networks in our brownie-config.yaml
Copying Mock Contracts from chainlink-mix
Deploying and using our mock
Refactoring
Deploying to a persistent ganache
brownie attach
Adding a persistent brownie network
resetting a network build
Funding and Withdrawing Python Scripts
Fund Script
Withdraw Script
Testing across networks
test_can_fund_and_withdraw
default networks
pytest pip install pytest
pytest.skip
brownie exceptions
mainnet-fork
Custom mainnet fork
Adding a development brownie network
brownie networks add development mainnet-fork-dev cmd=ganache-cli host=http://127.0.0.1 fork=’https://infura.io/v3/$WEB3_INFURA_PROJECT_ID’ accounts=10 mnemonic=brownie port=8545
Alchemy
brownie test –network mainnet-fork
brownie ganache vs local ganache vs mainnet-fork vs testnet…
Git
Installing Git
Creating a repository
First time with git
Adding our project to github
Lesson 8: Smart Contract Lottery
Introduction
- Add a README.md
- Defining the project
- Is it decentralized?
Lottery.sol
- basic setup
- Main Functions
- address payable[]
- getEntranceFee & Setup
- Chainlink Price Feed
- brownie-config
- SPDX
- Matching Units of Measure
- Can’t just divide
- Test early and often
- Quick Math Sanity Check
- deleting networks
- Alchemy again
- Enum
- startLottery
- Openzeppelin… Is this the first openzeppelin reference?
- Openzeppelin Contracts Github
- Randomness
- Pseudorandomness
- block keyword
- block.difficulty
- block.timestamp
- keccack256
- True Randomness with Chainlink VRF
- Chainlink VRF Remix Version
- Inheriting Constructors
- Oracle Gas & Transaction Gas
- Why didn’t we pay gas on the price feeds?
- Chainlink Node Fees
- Request And Receive Introduction
- Kovan Faucets
- Funding Chainlink Contracts
- Request And Receive Explanation
- A Clarification
- endLottery
- returns (type variableName)
- fulfillRandomness
- override
- Modulo Operation (Mod Operation %)
- Paying the lottery winner
- Resetting the lottery
Testing Lottery.sol
- deploy_lottery.py
- get_account() refactored
- get_contract
- contract_to_mock
- Contract.from_abi
- Adding the parameters to deploying to lottery
- vrfCoordinatorMock and adding mocks
- LinkToken and Mocks
- Successful Ganache Deployment!
- Python Lottery Scripts/Functions
- start_lottery
- Brownie tip: Remember to tx.wait(1) your last transaction
- enter_lottery
- end_lottery
- Funding with LINK
- brownie interfaces
- Waiting for callback
- Integration Tests & Unit Tests
- Test all lines of code
- test_get_entrance_fee
- pytest.skip (again)
- test_cant_enter_unless_started
- test_can_start_and_enter_lottery
- test_can_pick_winner_correctly
- Events and Logs
- callBackWithRandomness
Lesson 9: ERC20s, EIPs, and Token Standards
- ERC20/EIP20 Standard
- What is an ERC20?
- Creating an ERC20
- OpenZeppelin ERC20
- Solidity 0.8
- I Challenge you to code this yourself!
- deploy_token.py
- Copy paste helpful_scripts.py
- Viewing our token in metamask
- Adding to an exchange
Lesson 10: Defi & Aave
Defi Intro
- Defipulse
- Defillama
- Aave Testnet Site
- Paraswap
- Decentralized Exchange
Aave UI
- Kovan ETH
- What is Aave?
- Borrowing and Lending
- Connecting to Aave
- Depositing Tokens / Lending
- Checking your transaction is correct
- WETH Gateway
- Interest Bearing Token (aToken)
- Collateral
- DAI
- Stablecoin
- Wrapped Bitcoin (wBTC)
- Why borrow tokens?
- Blockchain Fintech Tutorial
- DISCLAIMER ABOUT BORROWING
- Borrowing Tokens
- Liquidations
- Your health factor must be above 1
- Solvent
- Stable vs Variable Interest Rate
- Repaying our borrows/loans
- Reward token / governance token
- Governance
Programmatic Interactions with Aave
- Quant Defi Engineer
- Aave Documentation
- Setup
- Converting ETH -> WETH
- get_weth.py
- IWETH
- Kovan WETH Token Address: 0xd0a1e359811322d97991e03f863a0c30c2cf029c
- Mainnet WETH Token Address: 0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
- Converting WETH -> ETH with withdraw
- aave_borrow.py
- LendingPool
- LendingPoolAddressProvider
- LendingPool and LendingPoolAddressProvider Addresses
- Fixing import dependencies
- Aave Github
- ERC20 Approve Function
- IERC20 from Patrick’s repo
- deposit
- getUserAccountData
- Liquidation Threshold
- Risk Parameters
- Borrowing DAI
- Getting DAI Conversion Rate
- Chainlink Price Feeds
- AggregatorV3Interface
- borrow
- Mainnet DAI Address: 0x6b175474e89094c44da98b954eedeac495271d0f
- Aave Testnet Token Addresses
- Repaying
- Kovan Run
- Viewing the transactions
Lesson 11: NFTs
Non-Technical Explainer
- End-to-end article
- What is an NFT?
- ERC721
- Token URI
- Token Metadata Example
- IPFS
Simple NFT
- brownie mix
- Initial Setup
- SimpleCollectible.sol
- OpenZeppelin ERC721
- Pug Image
- NFT Constructor
- NFT is a type of factory pattern
- createCollectible
- _safeMint
- TokenURI & Metadata
- Opensea listing example
- Is this decentralized?
- Ethereum Size and dStorage
- Ethereum Size
- dStorage Solutions
- IPFS
- You need to have your NFT attributes both on-chain and inside your tokenURI metadata
- deploy_and_create.py
- TokenURI used for the demo: https://ipfs.io/ipfs/Qmd9MCGtdVz2miNumBHDbvj8bigSgTwnr4SbyH6DNnpWdt?filename=0-PUG.json
- IPFS Companion
- Rinkeby Deployment
- Opensea Example
Advanced deploy_and_create
- Move OPENSEA_URL to helpful_scripts
- Deploying AdvancedCollectible
- Opensea testnet is only compatible with Rinkeby
- Rinkeby Chainlink VRF Contract Addresses
- Speeding through adding functions from previous projects
- Deploy to Rinkeby
- create_collectible.py
- A quick unit test
- A quick integration test
Creating Metadata & IPFS
- create_metadata.py
- get_breed
- Metadata Folder
- metadata_template
- NFT Metadata Attributes
- Checking if Metadata file already exists
- Uploading to IPFS
- upload_to_ipfs
- Download IPFS Command Line
- Download IPFS Desktop
- HTTP IPFS Docs
- ipfs daemon
- Pinata
- Pinata Docs
- Refactoring to not re-upload to IPFS
- Setting the TokenURI
- End-To-End Manual Testnet Test
- Viewing on Opensea
Lesson 12: Upgrades
Introduction to upgrading smart contracts
- Smart Contracts can be upgraded!
- Does this mean they are not immutable?
- Trail of Bits on Upgradeable Smart Contracts
- The “Not Really Upgrading” / Parameterization Method
- The Social Yeet / Migration Method
- Contract Migration
- Proxies
- DelegateCall
- Terminology:
- Implementation Contract
- Proxy Contract
- User
- Admin
- Gotchas:
- Storage Clashes
- Function Selector
- Function Selector Clashes
- Proxy Patterns:
- Transparent Proxy Pattern
- Universal Upgrade Proxy Standard
- Diamond/Multi-Facet Proxy
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