storing Bitcoins completely offline, using what is known as cold storage. I recommend storing it in a bank safe if it holds any substantial value. The following won't defend against every conceivable attack on your digital doubloons, but it's a good place to start. This is because each bank has a brand value they would like to preserve, so they have incentives to secure the money in order to maintain customers trust. CryptoShuffler has stolen thousands of dollars by lurking on computers, and spying. A large percentage of Bitcoin enthusiasts are libertarians, though people of all political philosophies are welcome. When it sees a string of numbers that looks right, CryptoShuffler simply starts swapping the wallet ID the victim copied for its own malicious wallet address in payment fields. The more secure the ecosystem, the less attractive a target it is to bad actors.
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Storage is what you do with regards to keeping your private key safe, and computer security is your entire security effort to make sure your computer is not compromised in a way that could cost you all your Bitcoins. Similarly, many people use ProtonMail for storing a copy of their Bitcoin address private key for the same reason a ProtonMail message can only be accessed by the email account owner. Bitcoins are issued and managed without any central authority whatsoever: there is no government, company, or bank in charge of Bitcoin. Emin Gun Sirer, a distributed systems and cryptography researcher at Cornell University, goes so far as to suggest that you should "keep a backup of the seed key in a fireproof safe." This stuff is for real. The threats aren't just abstract or theoretical; new scams crop up, and old ones resurge, all the time. How to prevent Bitcoin theft? The malware works by lurking silently on a victims computer and passively monitoring their clipboard, waiting for the victim to copy a Bitcoin wallet address. The best way to defend against an attack like that (if your malware scanner doesn't detect the intrusion) is simply watching all transactions carefully, and taking steps to safeguard your assets so you know your data hasn't been exposed. Your setup also doesn't have to be fancy; you can store backups of your coins on any external storage device, like a portable hard drive.