okay but how does it actually work?
Let’s break it down:
1. Step 1: Hacker contract (let’s call it A) deposits a lil’ ETH into victim contract B.
2. Step 2: A asks B for a withdrawal.
3. Step 3: B starts the withdrawal but before it can update A’s balance…
4. Step 4: A jumps back in (re-enters) and says, “Hey, give me more ETH.”
5. Step 5: Rinse and repeat until B is broke.
This works because B doesn’t update balances before sending funds, which is like letting someone take money out of an ATM before checking their actual account balance. Classic mistake.
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It’s not a hack. It’s a dance. One step in, two steps out—with your money.
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