I was not sure how to formulate the question title. What I want to achieve is the same as VanityGen and many other tools do to create an address starting with a predefined part, but with private keys.

So basically I want to create a Bitcoin public/private key pair of which the private key begins with a string I define.

Are there tools that already do this? If not, is it possible? How should it be done theoretically?

  • Maybe think about brain wallet (just a few words to remember/save or combine). Whenever you will need to spend coins you will just go to bitaddress.org and generate private key. – user4973 May 11 '13 at 22:11

You can choose the private key to be whatever you want, and calculate the corresponding public key and bitcoin address.

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  • However, the more predictable the private key is, the weaker your security is. You don't want your private key to be "password" or expect your wallet to be empty. – David Schwartz Mar 20 '13 at 11:35
  • No I just want to know a specific part of it so that I can write the rest down and add additional security to remember a part myself. – Steven Roose Mar 20 '13 at 12:04
  • @AlgolCobol, How can I create such a priv/pub key pair? – Steven Roose Mar 20 '13 at 12:05
  • Still the question is only answered partially. "Are there tools that already do this? How should it be done theoretically?" – Steven Roose May 12 '13 at 14:35

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