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Cyfrin-Updraft-Course

Cyfrin-Updraft-Course

Practical Foundry Smart Contracts

Summary

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

  • The course deals with blockchain development and security auditting.

  • Notes:

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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
  1. Biuld and Compile smart contracts in the project
forge build

or

I prefer forge compile

forge compile
  1. 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
  1. Run anvil command to list all fake available accounts ready for testing purposes:
anvil

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