ERC-20: Write Your First Token with Solidity and Foundry
Implement a minimal ERC-20 token to understand the standard, write tests with Foundry, then switch to OpenZeppelin and deploy on a local network.
Solana Account Model: Understanding SVM State Storage via Java
Learn what Solana accounts contain, who can modify accounts, how to calculate rent, and how to read account data using Java 21.
Transactions in Ethereum: nonce, gas, and signatures
Understand the three core components of an Ethereum transaction: nonce, gas (EIP-1559), and ECDSA signatures, then create, sign, and send transactions yourself using web3j.
EVM vs SVM: Why Solana Runs in Parallel
Compare the execution models of EVM and SVM, explaining how Solana uses explicit account declarations to run multiple transactions in parallel across multiple cores.
Reentrancy: The Vulnerability That Cost The DAO $60 Million
An analysis of the reentrancy vulnerability that caused the 2016 The DAO hack, recreated in Solidity and showing proper mitigation techniques.
How does EVM work? Decoding Ethereum Virtual Machine
Learn EVM architecture, stack, memory, storage, gas and how transactions are executed — with Solidity and Java Web3j examples.
Solidity Basics: Contracts, State, and Functions
Learn contracts, state variables, functions, modifiers, and events in Solidity through a simple Wallet contract example, with tests using Hardhat.
What is Gas and Why Fees Change in EVM
Explains gas, gas limit, base fee, priority fee in EVM and how transaction fees fluctuate with EIP-1559, with Java examples for calculation.