BlockchainHands-on Web3 security training

Master blockchain and smart contract security.

Hands-on courses on Web3, smart contracts, and on-chain security — from fundamentals to auditing.

00: Fundamentals
01: Smart contracts
02: DeFi & protocols
03: Security audits

Vault.solsolc 0.8.26

1contract Vault {
2  mapping(address => uint256) balances;
3
4  function withdraw() external {
5    uint256 amt = balances[msg.sender];
6    (bool ok,) = msg.sender.call{value: amt}("");
7    require(ok);
8    balances[msg.sender] = 0;
9  }
10}

CriticalReentrancy in withdraw()L6

Update state before the external call.

Curriculum

Every block builds on the last.

A linear path from how a chain works to how it breaks — each module verified before the next one is mined.

blk#00
Fundamentals
Hashes, keys, consensus and what a transaction really is.
blk#01
Smart contracts
Solidity, the EVM and testing with Foundry.
blk#02
DeFi & protocols
AMMs, lending, oracles and their failure modes.
blk#03
Security audits
Threat models, exploits and writing a real report.

Why us

From first block to final audit.

Smart contracts

Write, break, and secure Solidity.

Real audits

Learn the methodology auditors actually use.

Web3 ready

Skills for DeFi, NFTs, and protocol security.

Ready to think like an auditor?

Tell us about your goals or your team — we will point you to the right track.

Get started

Master blockchain and smart contract security.

Every block builds on the last.

Fundamentals

Smart contracts

DeFi & protocols

Security audits

From first block to final audit.

Smart contracts

Real audits

Web3 ready

Ready to think like an auditor?