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How I Built a Zero-Database Address Poisoning Detector for Crypto Wallets
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How I Built a Zero-Database Address Poisoning Detector for Crypto Wallets

DEV Community: javascript·XenoVenom·about 18 hours ago
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Detecting the silent scam that tricks users into sending funds to the wrong address — without storing any data.

The Silent Killer of Crypto

Address Poisoning is one of the most psychologically deceptive scams in Web3. It doesn't exploit smart contracts. It doesn't use malicious code. It exploits human habit.

Here's how it works:

You send 100 USDC to your friend at 0x1234...5678

A scammer bot monitors the mempool and sees this transaction

The scammer sends a 0-value transaction FROM an address that looks almost identical: 0x1234...5679

Both transactions now appear in your MetaMask activity history

Next time you want to send funds to your friend, you copy the address from your history

You accidentally copy the scammer's address (because it looks 99% identical)

You send your funds to the scammer

The scary part? No security tool catches this. The transaction is technically valid. The address is real. The wallet sends it.…

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