Cold storage
Holding crypto keys on a device that never touches the internet - the opposite of keeping coins on an exchange.
Holding crypto keys on a device that never touches the internet - the opposite of keeping coins on an exchange.
A wallet is really a key: whoever signs with it owns the coins. Cold storage keeps that key offline - in a hardware device, on paper, stamped in metal - so no remote attacker can reach it, while an exchange balance is a ledger entry with the venue holding the keys for you. The trade is custody against convenience: you stop trusting the exchange's security and start trusting your own backups, and every recovery scenario (fire, theft, inheritance) becomes your problem to engineer.
Practical cold storage is more than buying a device. Seed-phrase backups in two physical locations, a passphrase layer if the threat model warrants it, and a tested recovery drill are the parts people skip - and the parts that matter when the device is lost. For balances you are not actively trading, moving them off a venue and confirming the withdrawal address on the device screen is the single highest-value security step available to a retail holder.
Worked example
You buy one bitcoin on an exchange and leave it there; the venue holds the keys and your recourse is its solvency and its support queue. Moving it to a hardware wallet replaces that counterparty risk with a 24-word backup you are solely responsible for - which is the point.
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