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How to create Merkle Trees for airdrops

Let's learn about merkle trees and how they can be used to create airdrops in a gas-efficient way.

How Ethereum nodes store data and executes smart contracts

Let's learn about how Ethereum nodes store data and how smart contracts run in EVM.

Borrow millions without collateral from Aave using Flash Loans

Let's learn how to borrow a loan worth millions in crypto without paying a single cent using Aave Flash Loans.

The bug which cost Ethereum $60 million dollars: Re-entrancy

Let's learn about the Re-Entrancy attack that cost $60 million

Access private data in smart contracts

Let's learn about how to read the private data in smart contracts

Run code from other contracts inside your own using delegatecall

Let's learn about delegatecall attacks, where one contract can change data in another contract.

Generating random numbers on-chain

Let's learn about how to use oracles to generate random numbers on-chain

Executing a denial of service on a smart contract

Let's learn about how to perform a DoS attack on the smart contract to make it inaccessible.

NEVER use tx.origin again

Let's learn about tx.origin and why not to use to determine the sender of a transaction.

Identifying genuine-looking contracts which are actually malicious

Let's learn how to detect legit-looking contracts which are malicious in nature.

Optimize gas in your Solidity code

Let's learn how to optimize smart contracts to build the cheapest transactions possible.

Using metatransaction to pay for your users' gas

Let's learn about meta transactions and how to pay for someone else's transactions gas fees.

Build your own MEV searcher using Flashbots

Let's learn about how to create and use Flashbots