What is a private key?

A private key is a secret code that gives you control over your Bitcoin. Never share it!

Marcus is starting his Bitcoin investment plan. He's deciding where to store his Bitcoin: a hot wallet on his phone (needs daily access) or cold wallet offline (holds long-term savings). For a long-term savings strategy, why would cold storage be superior despite being less convenient?

Cold wallets store keys offline, making them immune to hacking and malware. The inconvenience is worth the security for large amounts held long-term.

Alex backed up their private key on paper and stored it at home. Their house catches fire. What is the security consequence?

Bitcoin exists on the blockchain, not on your device or paper. Even if your backup is destroyed, as long as someone else knows your private key or it can be recovered, the Bitcoin is safe. The network is unaffected.

Wallets and Keys

6 min readarticleIncludes quiz · 3 questions

Your Bitcoin wallet does not actually contain Bitcoin — just like your email app does not contain emails. Your wallet holds your private keys, which are mathematical proof that certain Bitcoin on the blockchain belongs to you. Lose your keys, lose your Bitcoin. Keep your keys safe, and no one on earth can take your Bitcoin from you.

To use Bitcoin, you need a wallet - a digital tool that stores your private keys and allows you to send and receive Bitcoin.

Types of wallets:

•Hot Wallets: Connected to the internet (convenient but less secure)
•Cold Wallets: Offline storage (more secure but less convenient)
•Hardware Wallets: Physical devices that store keys offline
•Paper Wallets: Keys printed on paper

Key Takeaway

The phrase "not your keys, not your coins" is not a slogan — it is a technical fact. When your Bitcoin is on an exchange, the exchange holds the keys. When you hold your own keys in a personal wallet, you have true ownership for the first time in the history of digital assets.

Test Your Knowledge

3 questions · Passing score: 75%

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