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Physical Bitcoin Storage Since most users are far more comfortable with physical security than information se‐ curity, a very effective method for protecting bitcoin is to convert them into physical form. Bitcoin keys are nothing more than long numbers. This means that they can be stored in a physical form, such as printed on paper or etched on a metal coin. Securing the keys then becomes as simple as physically securing the printed copy of the bitcoin keys. A set of bitcoin keys that is printed on paper is called a “paper wallet” and there are many free tools that can be used to create them. I personally keep the vast majority of my bitcoins (99% or more) stored on paper wallets, encrypted with BIP0038, with multiple copies locked in safes. Keeping bitcoin offline is called cold storage and it is one of the most effective security techniques. A cold storage system is one where the keys are generated on an offline system (one never connected to the Internet) and stored offline either on paper or on digital media, such as a USB memory stick. Hardware Wallets In the longer term, bitcoin security will increasingly be implemented with hardware tamper-proof wallets. Unlike a smartphone or desktop computer, a purpose-built bit‐ coin hardware wallet has only one purpose and function - holding bitcoins securely. Without general purpose software to compromise and with limited interfaces, hardware wallets can deliver an almost foolproof level of security to non-expert users. I expect to see hardware wallets becoming the predominant method of bitcoin storage. For an example of such a hardware wallet, see the Trezor (http://www.bitcointrezor.com/) Balancing Risk (loss vs. theft) While most users are, rightly, concerned about theft, there is an even bigger risk of loss. Data files get lost all the time, but if they contain bitcoin the loss is much more painful. In the effort to secure their bitcoin wallets, users must be very careful not to go too far and end up losing the bitcoin. In the summer of 2010, a well known bitcoin awareness and education project lost almost 7,000 bitcoins. In an effort to prevent theft, the owners had implemented a complex series of encrypted backups. In the end they accidentally lost the encryption keys, making the backups worthless and losing a fortune. Like hiding money by burying it in the desert, if you do it too well you might not be able to find where you buried it. Diversifying Risk Would you carry your entire net-worth in cash in your wallet? Most people would consider that reckless, yet bitcoin users often keep all their bitcoin in a single wallet. Instead, users should spread the risk among multiple and diverse bitcoin wallets. The prudent user will keep only a small fraction, perhaps less than 5%, of their bitcoins in User Security Best Practices | 239PDF Image | Mastering Bitcoin
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