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I'd like to present a standalone command line vanity address generator called vanitygen. There are plenty of quality tools to do this right now already. So why use vanitygen? The main reason is that it is fast, more than an order of magnitude faster than the official bitcoin client with the vanity address patch applied. This is despite the fact that it runs on the CPU and does not use OpenCL or CUDA. Vanitygen is also a bit more user-friendly in that it provides feedback on its rate of progress and how many keys it has checked. Vanitygen is written in C, and is provided in source code form and pre-built Win32 binaries. At present, vanitygen can be built on Linux, and requires the openssl and pcre libraries. Vanitygen can generate regular bitcoin addresses, namecoin addresses, and testnet addresses. Vanitygen can search for exact prefixes or regular expression matches. When searching for exact prefixes, vanitygen will ensure that the prefix is possible, will provide a difficulty estimate, and will run about 30% faster. Exact prefixes are case-sensitive by default, but may be searched case-insensitively using the "-i" option. Regular expression patterns follow the Perl-compatible regular expression language. Vanitygen can accept a list of patterns to search for, either on the command line, or from a file or stdin using the "-f" option. File sources should have one pattern per line. When searching for N exact prefixes, performance of O(logN) can be expected, and extremely long lists of prefixes will have little effect on search rate. Searching for N regular expressions will have varied performance depending on the complexity of the expressions, but O(N) performance can be expected. By default, vanitygen will spawn one worker thread for each CPU in your system. If you wish to limit the number of worker threads created by vanitygen, use the "-t" option. The example below completed quicker than average, and took about 45 sec to finish, using both cores of my aging Core 2 Duo E6600: $ ./vanitygen Zenyh Difficulty: 4553521 Pattern: Zenyh Address: ZenyhZSGkdar6TGkk9gECwoUkmBPkn4ALa Privkey: 5JHMFHQMF3cbkhBdEXtXsgFwtFuN6N4kUbp6QfX4fZn2GmtDHWv Currently, it is difficult to import the private key into bitcoin. Sipa's showwallet branch has a new command called "importprivkey" that accepts the base-58 encoded private key. Vanitygen has been tested to work with that version of bitcoin. Donate or Tip to nao20010128nao: ZkEDhozS4WZvAPeSudyyy7tbAXnUqqvkRw