This video explains how to add liquidity to Uniswap using Solidity.

Add liquidity 0:30
Remove liquidity 5:42
Ganache demo 8:19

https://github.com/t4sk/defi-by-example

#DeFi #Uniswap #SmartContract #Ethereum

# References
Uniswap https://app.uniswap.org/
Etherscan https://etherscan.io

Follow on Twitter: @ProgrammerSmart https://twitter.com/ProgrammerSmart
Join me on Discord: https://discord.gg/Ny8sPaj
Website: https://smartcontractprogrammer.com

How are the prices for token exchanged determined on Uniswap? Here I will explain how pricing is calculated using a mathematical equation x * y = k

x * y = k equation 0:43
spreadsheet simulation 2:46
dy = ? 5:17
Uniswap V2 pair and router contract 7:01

#DeFi #Uniswap #SmartContract #Ethereum

# References
Uniswap https://app.uniswap.org/
Etherscan https://etherscan.io

Uniswap V2 Pair DAI - ETH contract
https://etherscan.io/address/0xA478c2975Ab1Ea89e8196811F51A7B7Ade33eB11#readContract

Uniswap V2 Router contract
https://etherscan.io/address/0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D#readContract

x * y = k spreadsheet
https://docs.google.com/spreadsheets/d/15JB5nwHwimpRZvTs8pmTeVzF0wJc4WpDz7CAgI_6_X0/edit?usp=sharing

Follow on Twitter: @ProgrammerSmart https://twitter.com/ProgrammerSmart
Join me on Discord: https://discord.gg/Ny8sPaj
Website: https://smartcontractprogrammer.com

Let's learn about DeFi. This video explains how to trade an ERC20 token for another using a decentralized exchange called Uniswap.

Overview 0:20
Solidity code 1:18
Test 4:46
Run test using Ganache 7:25

#DeFi #Uniswap #SmartContract #Ethereum

Code: https://github.com/t4sk/defi-by-example

# References
Uniswap https://app.uniswap.org/
Etherscan https://etherscan.io

Follow on Twitter: @ProgrammerSmart https://twitter.com/ProgrammerSmart
Join me on Discord: https://discord.gg/Ny8sPaj
Website: https://smartcontractprogrammer.com

In this video I explain how to test smart contracts on the mainnet without sending any transaction.

#Ganache #Truffle #MainnetFork #Test #SmartContract #Ethereum

Run Ganache with mainnet fork 2:07
Query DAI balance 3:16
Transfer DAI 5:08

Code: https://github.com/t4sk/defi-by-example

# References
Ganache and Truffle https://www.trufflesuite.com/
Infura https://infura.io
Etherscan https://etherscan.io

Follow on Twitter: @ProgrammerSmart https://twitter.com/ProgrammerSmart
Join me on Discord: https://discord.gg/Ny8sPaj
Website: https://smartcontractprogrammer.com

Slither is an easy to use security tool that finds potential security holes in your smart contracts. This video explains the basic usage of Slither.

#Slither #Security #SmartContract #Ethereum

Basic usage 1:05
Ignore previous warnings 3:14

Slither commands
https://github.com/t4sk/hello-smart-contract-security-tools#slither

Example truffle project
https://github.com/t4sk/solidity-multi-sig-wallet

# References
Slither
https://github.com/crytic/slither

Follow on Twitter: @ProgrammerSmart https://twitter.com/ProgrammerSmart
Join me on Discord: https://discord.gg/Ny8sPaj
Website: https://smartcontractprogrammer.com

How do you become an Ethereum smart contract engineer in 2021? What skills do I need? Where do find jobs? What online resources do I use? I answer these questions.

#Career #Job #SmartContractEngineer #SmartContract #Ethereum

Job description, pros and cons 0:27
Job hunt 4:20
Required skills 6:50
Online presence 11:30
How to stay up to date 11:57

### Road map ###
https://coggle.it/diagram/YCzP1lR6dWF3jfas/t/ethereum-smart-contract-engineer-2021

### Job hunt ####
https://angel.co/jobs
https://cryptocurrencyjobs.co/
https://cryptojobslist.com/

### Problem Solving ###
https://algoexpert.io
https://leetcode.com

### Skills ###
https://www.trufflesuite.com/
https://hardhat.org/
https://ethereum-waffle.readthedocs.io/en/latest/
https://eth-brownie.readthedocs.io/en/stable/

https://github.com/crytic/slither
https://github.com/crytic/echidna
https://manticore.readthedocs.io/en/latest/

### Twitter ###
https://twitter.com/samczsun
https://twitter.com/defiprime
https://twitter.com/optimismPBC
https://twitter.com/CurveFinance
https://twitter.com/gakonst
https://twitter.com/peckshield
https://twitter.com/dguido
https://twitter.com/the_matter_labs
https://twitter.com/bantg
https://twitter.com/AndreCronjeTech
https://twitter.com/VitalikButerin

### YouTube ###
Dapp University
https://www.youtube.com/channel/UCY0xL8V6NzzFcwzHCgB8orQ
EatTheBlocks
https://www.youtube.com/channel/UCZM8XQjNOyG2ElPpEUtNasA
Defi Weekly
https://www.youtube.com/channel/UCksmBX-Jj_FGYX3EJahKW3Q
Finematics
https://www.youtube.com/channel/UCh1ob28ceGdqohUnR7vBACA
Ceazor's Snack Sandwich
https://www.youtube.com/channel/UC_o4_cOevPVYC5pXs9OOexg

## Podcast ##
Unchained Podcast
https://www.youtube.com/channel/UCWiiMnsnw5Isc2PP1to9nNw
aantonop
https://www.youtube.com/channel/UCJWCJCWOxBYSi5DhCieLOLQ
Bankless
https://www.youtube.com/channel/UCAl9Ld79qaZxp9JzEOwd3aA
The Daily Gwei
https://www.youtube.com/channel/UCvCp6vKY5jDr87htKH6hgDA

## Blockchain Technical ##
Blockchain at Berkeley
https://www.youtube.com/c/BlockchainatBerkeley/videos

## Software Engineer Career Advice ##
Andy Sterkowitz
https://www.youtube.com/channel/UCZ9qFEC82qM6Pk-54Q4TVWA
Chris Hawkes
https://www.youtube.com/channel/UCfV36TX5AejfAGIbtwTc7Zw
Stefan Mischook
https://www.youtube.com/channel/UCyUBW72KU30dfAYWLVNZO8Q
Traversy Media
https://www.youtube.com/c/TraversyMedia/videos

## Tech ##
freeCodeCamp.org
https://www.youtube.com/channel/UC8butISFwT-Wl7EV0hUK0BQ
Hussein Nasser
https://www.youtube.com/c/HusseinNasser-software-engineering/videos
Coding Tech
https://www.youtube.com/c/CodingTech/videos

### Website ###
https://ethereum.stackexchange.com/
https://vitalik.ca/
https://ethresear.ch/
https://blog.trailofbits.com/

Follow on Twitter: @ProgrammerSmart https://twitter.com/ProgrammerSmart
Join me on Discord: https://discord.gg/Ny8sPaj
Website: https://smartcontractprogrammer.com

We will put together the basic concepts of Vyper and implement a payment channel. Payment channel enables stream of payments to go back and forth between 2 parties. It is one technique to scale layer 1 blockchain by exchanging signature offchain and only submitting a single transaction to finalize the payments.

#Vyper #PaymentChannel #SmartContract #Ethereum

Payment channel 2:41
Code 4:44
getHash 7:03
getEthSignedHash 10:55
verify 12:19
close 14:20
cancel 17:13
Remix 20:08

Code: https://github.com/t4sk/vyper-by-example

# References
Remix IDE: http://remix.ethereum.org
Vyper: https://vyper.readthedocs.io

Follow on Twitter: @ProgrammerSmart https://twitter.com/ProgrammerSmart
Join me on Discord: https://discord.gg/Ny8sPaj
Website: https://smartcontractprogrammer.com

Learn how to sign and verify signatures using Vyper and MetaMask.

#Vyper #Signature #SmartContract #Ethereum

Overview 0:07
Code: 0:28
Remix demo 4:07

Code: https://github.com/t4sk/vyper-by-example

# References
Remix IDE: http://remix.ethereum.org
Vyper: https://vyper.readthedocs.io

Follow on Twitter: @ProgrammerSmart https://twitter.com/ProgrammerSmart
Join me on Discord: https://discord.gg/Ny8sPaj
Website: https://smartcontractprogrammer.com

Vyper has an easy way to protect contracts from re-entrancy. This video explains how to use the @nonreentrant decorator.

#Vyper #ReEntrancy #SmartContract #Ethereum

Hand crafted re-entrancy lock 0:23
Non re-entrant decorator 2:21
Grouping re-entrancy locks 4:19

Code: https://github.com/t4sk/vyper-by-example

# References
Remix IDE: http://remix.ethereum.org
Vyper: https://vyper.readthedocs.io

Follow on Twitter: @ProgrammerSmart https://twitter.com/ProgrammerSmart
Join me on Discord: https://discord.gg/Ny8sPaj
Website: https://smartcontractprogrammer.com

This video explains how the minimal proxy contract is implemented in Solidity. This contract is equivalent to the function create_forwarder_to in Vyper

Delegatecall 1:25
Bytecode 4:08
Actual code of minimal proxy 4:39
Creation and runtime code 4:58
Coding in Solidity 5:52

#Solidity #Vyper #MnimalProxy #create_forwarder_to

Code: https://solidity-by-example.org/app/minimal-proxy

References
https://blog.openzeppelin.com/deep-dive-into-the-minimal-proxy-contract/
https://github.com/optionality/clone-factory/blob/master/contracts/CloneFactory.sol

Remix IDE: http://remix.ethereum.org
Solidity: https://solidity.readthedocs.io
Vyper: https://vyper.readthedocs.io

Follow on Twitter: @ProgrammerSmart https://twitter.com/ProgrammerSmart
Join me on Discord: https://discord.gg/Ny8sPaj
Website: https://smartcontractprogrammer.com