jpja/btc-and-xcp-passphrase-tools

Retrieve/regenerate your counterwallet bitcoin addresses & privatekeys using your counterwallet 12 word passphrase. Also allows you to sign messages with your private keys

##BTC and XCP Passphrase Tools##

• Each tool is a separate html file which can run offline. You do not need to unzip the directory to run a tool.
• I encourage others to review the code and potentially improve/fork it.

Tools are experimental. Pending security audit. Use at own risk!

###Paperwallet###

Outputs a printer friendly paper wallet.

It prints the list of Bitcoin/Counterparty addresses and (optionally) private keys derived from a passphrase. The passphrase is compatible with Counterwallet, XCP Wallet for Chrome, and GetGems Messenger.

• The code is forked from Blockscan's key generation tool. All changes are cosmetic.

###Vanity-address###

Finds a passphrase with vanity addresses. Specify vanity patterns for up to three addresses. The pattern starts with 1 followed by one or more characters. When specifying a pattern, consider this:

• The algorithm tries random passphrases until it finds the desired pattern. This can take a long time. Your browser may freeze.
• By default it stops searching after 1000 iterations but you can ovverrule this by typing inf at the begining of the random text input string.
• Around 10 passphrases are tested per second. The probability of an address starting with 1A is 1/22. Therefore it takes a couple of seconds to find an address which starts with 1A. If you want both the first two addresses to start with 1A, the probability is squared; 1/484. Be prepared to wait around a minute. If all three addresses shall start with 1A, the proability is cubed and you'll likely have to wait around twenty minutes.
• Addresses starting with 12,...,19,1A,...,1P are the easiest to find.
• For subsequent characters the probability is approx. 1/58. Therefore by adding one character to one address you'll expect to wait 58 times longer!
• Example: To make one address start with 1CP, expect to wait 2-3 minutes; p = 1/(22*58).
• Example: To make one address start with 1XP, expect to wait a couple of hours. This is slow because 1X is rare; p=1/(1353*58).
• Example: To make both the first two addresses start with 1A, expect to wait less than a minute; p=1/22^2.
• Example: To make all the first three address start with 1A, expect to wait around twenty minutes; p=1/22^3.

###Brain-passphrase###

Generates a 12-word passphrase from a text input. The passphrase can be used in Counterwallet, XCP Chrome Wallet and GetGems Messenger.

• It can be used as a sort of brain wallet. I advice against using it as such, but feel free to play around.

###Formatted###

Generates a 12-word passphrase with words only of a specified length.

• It can be useful for example for a mobile app where a shorter passphrase is needed to fit the screen.
• The downisde is security. Only a subset of the dictionary is used, hence significantly fewer possible combinations.

###Dictionary###

Displays all the 1626 words used to generate a 12-word passphrase.