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To calibrate your output, print out this page in LANDSCAPE (wide) format. Based on the results, adjust the "zoom" and "horizontal shift" until your printed ruler approximates a real ruler, and leaves equal margins on the left and right sides of the page. Consider letting us know what settings worked best.
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The calibration step helps line up the front and back sides of your printout. Print out this page in LANDSCAPE (wide) format. Based on the results, adjust the "zoom" and "horizontal shift" until your printed ruler (1) approximates a real ruler, and (2) is horizontally centered, leaving approximately equal margins on the left and right sides of the page.
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+ What settings worked best for you? Feedback form »
Print Calibration Test
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If you are making a paper wallet for a vanity address, or duplicating an existing paper wallet:
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+ In this case, simply enter your private key in Wallet Import Format (or scan it using the "validate" feature on this web page.) WIF keys always begin with the number 5 and look something like this: '5JnwJNC7q3...'
The public address, e.g. '1vanityABC456...' is automatically calculated using the private key, so you only need to provide the private key.
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If you want to roll dice or shuffle a deck of cards to generate a key:
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+ Maybe you don't trust that this software (or computers in general) can generate sufficiently random numbers. In this case, you can supply your own random data points from virtually any source. For example, you can roll a six sided die at least 62 times and enter each roll in sequence, e.g. '15249385...' Or, you can mix up a deck of 52 playing cards (after thoroughly shuffling it at least 10 times) and enter at least the top 31 cards in this format: 5S-10H-AC-... (where 5S = 5 of Spades, 10H = 10 of Hearts, AC = Ace of Clubs, etc.)
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No special formatting is required. Just type in a great deal of (truly) random text from any source, and whatever you supply will be SHA256 hashed and converted into a private key and public address.
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If you want to make a paper wallet which can also be accessed using a passphrase (AKA a "brain wallet"):
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+ You can make a so-called "brain wallet" by supplying a very, very, VERY secure passphrase, like '1852 Cloud SMASH fuzzy steamzonk'.
Be careful doing this because a wallet generated using an insecure passphrase will have its balance stolen within hours of receiving funds.
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The resulting paper wallet will still have an ordinary crypto-looking private key and public address, but you will
also be able to retrieve your wallet contents by entering your passphrase into the 'verify' tab of this service or a similar service such as
brainwallet.org.
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Note: supplying a brain wallet passphrase is different from BIP38-encrypting your wallet with a passphrase.
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