Free Blockchain Security Masterclass

TL;DR: Blockchain security fundamentals: understand the threat model first, then learn the tools. Most training teaches tools without context. Here’s what actually matters.

Everyone wants to learn “blockchain security” but don’t know where to start. Let me give you the foundation.

Step 1: Understand the Threat Model

Before learning security, know what you’re protecting:

• What asset? (smart contracts, DeFi protocols, exchanges)
• Who attacks it? (opportunistic hackers, APTs, insiders)
• What’s at risk? (dollars, privacy, availability)
• What’s the attacker’s goal? (steal funds, extort, disrupt)

Different threats need different defenses. An exchange needs different security than a gaming NFT contract.

Step 2: Learn Web2 Foundations

Blockchain security isn’t separate from traditional security. You need:

• Cryptography basics (hashing, signatures, encryption)
• Common vulnerabilities (SQL injection, buffer overflows concepts)
• Secure coding principles (input validation, error handling)
• Threat modeling methodologies

If you don’t understand Web2 security, Web3 security will be meaningless.

Step 3: Learn the EVM

Understand how Ethereum actually works:

• Transactions and transaction ordering (MEV, sandwich attacks)
• Storage layout (critical for proxy vulnerabilities)
• Opcodes and gas (DoS vectors)
• Call semantics (delegatecall, staticcall)

Read the Ethereum Yellow Paper or watch talks from people who wrote it. This isn’t optional.

Step 4: Learn Solidity (Really Learn It)

Not “hello world in Solidity.” Learn:

• Storage vs. memory vs. calldata (data location bugs)
• Function visibility and access control
• Reentrancy patterns and fixes
• Safe vs. unsafe arithmetic
• Upgradeable contract patterns and their bugs

Write code. Lots of it. Break it. Fix it.

Step 5: Learn DeFi Economics

Most hacks aren’t code bugs — they’re economic exploits:

• How lending protocols work (collateralization, liquidation)
• AMM mechanics (liquidity, slippage, MEV)
• Oracle design and manipulation vectors
• Flash loans and composability attacks

Understand incentives. Who benefits from what? That’s where exploits hide.

Step 6: Learn the Tools

NOW you’re ready for tools. Master:

• Foundry — Testing and mainnet forking
• Slither — Static analysis
• Echidna — Fuzzing
• Tenderly — Transaction tracing

Tools without understanding are useless. Understanding without tools is slow. You need both.

Step 7: Study Real Exploits

Read post-mortems of actual hacks:

• Cream Finance ($18M)
• Poly Network ($611M)
• Hundred Finance ($80M)
• Wormhole ($10M bounty)

Understand the attack vector. Reproduce it in Foundry. Then ask: “How would I have found this during an audit?”

Step 8: Red Team Your Own Code

Write a smart contract. Find ways to break it. Can you:

• Reentre into it?
• Overflow its arithmetic?
• Manipulate its oracle?
• Drain its funds?

If you can’t break your own code, attackers with $100M+ incentive will.

The Three Skills You Actually Need

After 27 years in security, here’s what separates good security people from great ones:

1. Systems thinking: Understand how components interact, where risks hide
2. Attacker mindset: Think like someone trying to steal money, not defend it
3. Paranoia: Assume nothing. Validate everything. Trust nobody.

Courses won’t teach you these. Experience will. Find a mentor, study under auditors, contribute to security audits. That’s how you actually learn.

The Hard Truth

There’s no shortcut. Good blockchain security engineers take 1-2 years of dedicated learning, plus years of experience. If someone promises to teach you “blockchain security in 4 weeks,” they’re selling a course, not security.

But if you commit to the work — understand the fundamentals, practice constantly, study real attacks — you can become genuinely skilled. And the industry needs you.

Con dedicación y ayuda de expertos, puedes hacerlo. Sorry, I meant: with dedication and help from experts, you can do it.

Stay safe out there.

Learn blockchain security fundamentals at blockchainwhitehackers.com