the Binance hack? A crypto wallet doesn't actually hold your coins. It holds the private keys that let you move them. A hot wallet is connected to the internet, so it's fast and handy for sending and receiving, but that connection also makes it a target for hackers. A cold wallet keeps the keys offline, often on a small hardware device, so it's much harder to hack from afar, but it's slower to use and the device can be lost, broken or stolen.
Big exchanges use both. They keep a share of funds in hot wallets to pay out everyday withdrawals and hold more in cold storage. Last Thursday, Oct 29, about $6.3 billion in crypto was taken from Binance's hot wallets, and the exchange paused withdrawals. It reopened them in phases on Sunday, Nov 1, and said it processed about $4.65 billion in withdrawals and $1.01 billion in deposits that day, a net outflow of about $3.64 billion, or roughly 2.1% of its $171 billion in assets. Binance said it had replaced about 95% of the affected assets using company funds.
The bigger lesson for beginners is custody. When your coins sit on an exchange, the exchange holds the keys, so its security and its rules decide when you can move them. Holding your own keys gives you control, but also full responsibility, because a lost key usually can't be recovered. Neither choice is risk-free, so it's worth knowing which one you're using and why. Got questions about wallets, keys or how exchanges store coins? Ask below, there are no silly questions here.
Sources: CNBC and BBC (Nov 2, 2026); CoinDesk (Nov 1, 2026); SEC Investor.gov "Crypto Asset Custody Basics for Retail Investors"; FINRA "Storing Crypto Assets".
John Murray
Good lesson on custody: whoever holds the keys decides when you can move your coins. A simple habit is to keep only what you need for active trading on an exchange, and turn on app-based 2FA and a withdrawal allowlist wherever it's offered.
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