Majority of mine are on USB and in paper form, separated so 2 x...

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    Majority of mine are on USB and in paper form, separated so 2 x with encrypted wallet file stored in safety deposit box x 2.
    This I would say is extreme for most users, but for larger amounts and peace of mind, worth it.

    I guess the issue with offline wallets is it's entirely left up to you how to store it.
    Piece of paper, USB, in own vault, all of which can be found.
    Even a safety deposit box could be stolen, burn down, the USB stick could become fault, its all a risk.

    If you are more doing it for trading, then it probably makes more sense to use one of the online methods, but is risky.

    this below will give you some ideas:


    Decide How to Create your Paper Wallet

    There are a number of tools that make it easy to create a paper wallet. The most popular of which is bitaddress.org, which we’ll use this in this example. BitAddress is open source.
    First, open bitaddress.org in your browser. Save the page as an HTML file to your desktop and move it to a USB drive. From the USB we can move bitaddress to your offline computer or bootable operating system.
    bitaddress can be used online, but since we want to create secure cold storage we need to download the source file and run it on an offline computer. Using a bootable operating system also provides the same benefits as an offline computer. If you wanted to make paper wallets to give to your friends, printing directly from bitaddress.org on an online computer would be fine for small amounts. But not for secure storage.
    3. Opening BitAddress

    Bitaddress can automatically create paper wallets using your computer’s random number generator. Just navigate to the “paper wallets” tab and you’ll be able to create paper wallets in bulk. The default paper wallet looks like this:

    If you want to trust your computer’s random number generator, go ahead and print the wallets generated on this page But since we want to create the most secure form of storage possible, we’re going to show you how generate the RNG yourself.
    4. Generating RNG

    To generate your own entropy you’ll need five 6-sided dice, preferably high quality casino dice for true random numbers.
    Roll the five dice and arrange in any order to create one 5-digit number. Use this dice number list to obtain a word for the roll. If, for example, you rolled 11121, your word would be aaron. Repeat this 24 times, since you’ll need 24 words for a secure seed.
    Write down each word on one piece of paper like this. This will create the seed that will be used as the random entropy for your paper wallets.
    Create multiple copies of the word list and store in multiple locations. Laminate each copy and store in a fireproof safe if possible.
    5. Brain Wallet

    Now we need to input our high entropy seed into bitaddress. Navigate to the “Brain Wallet” tab on bitaddress. In the “Enter passphrase” and “Confirm Passphrase” fields, enter the 24-word seed you just created.

    Once you enter your 24-word seed two times you should get a Bitcoin address and private key like this:

    Your seed should be much longer than what’s shown above.
    To create multiple wallets paper wallets with the same seed, add a number to the end of the seed for each new wallet. For example, if your seed was closet blanket water … shoes, you could create multiple wallets using:
    • closet blanket water …. shoes1
    • closet blanket water …. shoes2
    This makes it easy to create many secure wallets using the same seed and entropy. You’ll only have to backup the one 24-word seed and not each individual wallet, as long as you can remember that each additional wallet is just seed1, seed2 and so on.
    It is recommended that you create multiple paper wallets so you don’t have to reuse Bitcoin addresses. This can take a lot of time but is worth it if you value privacy.
    6. Printing

    Don’t store any digital copies or screenshots of your paper wallets on a USB or computer. Since your funds must be safe from hackers, keep only physical copies of your paper wallet and not digital copies. Now print each paper wallet you created in step 5. If you believe your printer may store data, use a dedicated printer or make sure the printer is offline at the time.
    BIP 38

    To protect your paper wallet against physical theft, it’s possible to encrypt the paper wallet private key using BIP38.
    Using the method outlined in the tutorial above (steps 1-6), if someone were to physically discover your paper wallet they could swipe the funds. BIP38 adds additional protection by also requiring a password to access funds. At this time, there isn’t a tool that lets you use BIP 38 AND generate your own RNG. If you want to use BIP 38 you’ll have to trust your computer’s RNG and use Bitcoin Paper Wallet.
    DISCLAIMER: With both BitcoinPaperWallet.com and bitaddress.org, it’s your responsibility to verify you’re running the correct software.
    Keeping your Paper Wallet Safe

    Additional steps must be taken to keep your paper wallet(s) safe even after it has been created.
    Keep your paper wallet in a private and secure place. Hide if possible. Stick it in a safe, or even in a bank vault if you feel uncomfortable leaving it around your house.
    Keep multiple copies. No less than two copies of your paper wallet(s) should be created. More copies are better, but only when the additional copies are stored in different physical locations.
    Water damage or fires could damage or destroy your paper wallet(s) and result in permanent loss of funds. Use a fireproof safe and laminate your paper wallet to add even more protection.
    Hardware Wallets

    Hardware wallets have become popular because they make it easy for anyone to create offline storage. No technical knowledge is required, and the setup process is more simple than that of paper wallets.
    A Bitcoin hardware wallet is just a small offline computer or smart card that generates private keys offline. When funds are spent, a hardware wallet signs the transactions in its secure environment and sends the signed transaction to your computer and on to the Bitcoin network.
    Hardware wallets are backed up using HD seeds and also written on paper. Hardware wallet backups should also be protected from physical theft and damage and multiple copies kept.
    Some wallets like TREZOR allow users to add an additional custom word to the HD seed that will prevent someone who finds your seed from stealing your funds. The downside is that the passphrase must be memorized. In the case that it’s forgotten the passphrase cannot be recovered. It’s a passphrase and not a password.
    The three most popular hardware wallets on the market are the Ledger Nano, KeepKey, and TREZOR.
    Ledger Nano: Ledger Nano is Ledger’s flagship hardware wallet. It’s a smartcard wallet in USB form factor, meaning it can be plugged in directly to any computer’s USB port. The downside to the Nano is that it lacks a screen and must be initialized on a secure computer or operating system. Ledger offers its own Ledger Starter which will let you boot from a secure OS and initialize your device if you don’t have a dedicated offline computer.
    TREZOR: TREZOR was the first hardware wallet to offer a screen. Users can confirm transactions on the TREZOR itself, meaning TREZOR can be used with confidence even on malware infected computers.
    KeepKey: KeepKey is a fork of TREZOR’s code, with the slight differences being its digital screen vs TREZOR’s analog display. KeepKey’s larger screen also makes the recovery process slightly more secure.
    Software Wallets using Offline Computers

    Offline software wallets are very similar to hardware wallets. A dedicated offline computer is used to run a Bitcoin wallet like Armory or Electrum.
    A wallet is created on the offline computer. Using the public HD seed from the offline computer a watch only version of the wallet can be imported to an everyday computer. This allows payments to be received online, but all funds and private keys are still secured and stored on the offline computer.
    The process of setting up and signing transactions with this method can be complex for less technical users, which is another reason hardware wallets have become the way most new users store bitcoins.
    Armory

    Armory is considered the most secure offline software wallet. No external server is used for data because Armory maintains a full copy of the Bitcoin blockchain. No information is leaked which also makes Armory one of the most private Bitcoin wallets.
    There are two helpful guides that will show you how to create cold storage with Armory: one from Armory’s official website, and one at falkvinge.net.
    This 27-minute video guide will take you through the entire process:
    Electrum

    Electrum differs from Armory in that it pulls data from external servers in order to verify transaction data. While Electrum may be just as secure as Armory, it is less private. Electrum provides an offline storage tutorial on its website.
    Written by Melvin Draupnir on January 22, 2016.
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