Bitcoin Wallet Bug: Why Speeding Up a Payment Could Drain Your Wallet

The information provided in this article is for informational purposes only and does not constitute financial advice. Cryptocurrency investments carry a high degree of risk. Always conduct your own research.A Bitcoin wallet bug let rogue servers swap a real payment for a fake one and trick users into signing it. How the fee bump trap works and how to stay safe.Most $Bitcoin thefts need your seed phrase. This one did not. A flaw in Electrum, one of the oldest Bitcoin wallets, let a malicious server replace a pending payment with a fake one and then wait for you to do something completely routine: speed it up. The moment you approved the higher fee, you signed the attacker’s transaction instead of your own. At least one user lost funds before the fix landed on October 24. Here is what happened and why it matters even if you have never used Electrum.How does the Bitcoin fee bump trap work?Light wallets like Electrum do not download the whole blockchain. They ask external servers for your transaction history and for broadcasting payments. Confirmed transactions are checked against the chain, but pending ones were simply taken on trust from the main server the wallet happened to be conn...