Cyfrin-Updraft-Course

Cyfrin-Updraft-Course

Practical Foundry Smart Contracts

• Full Foundry FundMe Project

• Foundry Contracts Are Found In This Repo

Summary

• This are personal notes for the course am taking on Cyfrin Updraft Course.

• The course deals with blockchain development and security auditting.

• Notes:

To previews markdown, use [Ctr + Shift + V]

For Italics use: * word *

For Bold use: ** word **

Quick Notes On Creating & Compiling Smart Contracts In Foundry

• Creating a Foundry project on cmd, use the following commands:

Command for biulding or compiling:

forge compile

1. Initiate the project

forge init

2. Biuld and Compile smart contracts in the project

forge build

or

I prefer forge compile

forge compile

3. After making changed in the smart contracts, run forge test to test the updates or run a script using forge script

forge test

or

forge script

4. Run anvil command to list all fake available accounts ready for testing purposes:

anvil

5. Command to inpect the storage.

forge inspect Counter storage

6. Foundry command to test a function

forge test --match-test test_Increment

Build

cd ~/foundry-f23/foundry-simple-storage-f23

 forge create SimpleStorage --interactive

Deploying smart contract locally using anvil

forge script script/DeploySimpleStorage.s.sol --rpc-url http://127.0.0.1:8545 --broadcast --private-key 0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80

Sending Information On The Blockchain

cast send 0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266 "store(uint256)" 1337 --rpc-url $RPC_URL --private-key $PRIVATE_KEY

cast call 0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266 "retrieve()"

cast --to-base 0x0000000000000000000000000000000000000000000000000000000000000539 dec

Deploying a smart contract on testnet (Sepolia)

forge script script/DeploySimpleStorage.s.sol --rpc-url=$SEPOLIA_RPC_URL --private-key=$PRIVATE_KEY --broadcast

$ forge build

Test

$ forge test

Format

$ forge fmt

Gas Snapshots

$ forge snapshot

Anvil

$ anvil

Deploy

$ forge script script/Counter.s.sol:CounterScript --rpc-url <your_rpc_url> --private-key <your_private_key>

Cast

$ cast <subcommand>

Help

$ forge --help
$ anvil --help
$ cast --help

Notes

• On Replay Attacks i.e Double Spending:

• nonce is a unique identifier assigned to each transaction sent from a specific account. The nonce is used to ensure that each transaction is processed only once and to prevent replay attacks. nonce is incremented with every single transaction;

• Terms

• RPC -> Remote Procedure Call (RPC) URL
• Naas -> Node As A Service ...such as Alchemy.

• Happy Web3 Revolution