Cryptocurrency Hacking — How Billions Get Stolen

Cryptocurrency Hacking — Billions at Stake

Over $10 billion in cryptocurrency has been stolen through hacking. Here's how it happens.

Exchange Hacks

• 🔴 Mt. Gox (2014): 850,000 BTC stolen (~$450M at the time)
• 🔴 Ronin Network (2022): $625M stolen via compromised validator keys
• 🔴 WazirX India (2024): $230M+ stolen
• 🔴 FTX (2022): $600M drained during bankruptcy

Smart Contract Exploits

// Reentrancy Attack (The DAO Hack - $60M stolen)
// Vulnerable contract:
function withdraw(uint amount) {
    require(balances[msg.sender] >= amount);
    msg.sender.call{value: amount}("");  // Attacker reenters here!
    balances[msg.sender] -= amount;      // Too late!
}

Attack Vectors

• Phishing: Fake exchange websites and wallet apps
• SIM Swapping: Take over phone → bypass 2FA → drain wallet
• Flash Loans: Borrow millions, manipulate prices, repay in same transaction
• Bridge Exploits: Attack cross-chain bridges (weakest link)
• Clipboard Hijacking: Malware replaces copied wallet address with attacker's

How to Protect Your Crypto

• 🔒 Use hardware wallets (Ledger, Trezor)
• 🔒 Never share seed phrases — EVER
• 🔒 Use authenticator app for 2FA (not SMS)
• 🔒 Verify wallet addresses character by character
• 🔒 Use reputable exchanges only

🔥 Learn blockchain security at Code Hacker →