According to the downloads for the Bitcoin client, versions older than ~0.3.0 were "insecure". Since they are not available for download (and the lack of security is the given reason) no one can learn from them or verify the reason.

The question I have is, 1, does anyone have a copy of the original wallets and or their source code for download and, 2, does anyone know what made them insecure?

1 Answer 1


The source code for old versions is available in the Bitcoin-Qt Git repository. Click on the "branch: master" button and then select "Tags", and you can go all the way back to v0.1.5.

  • Thank you, didn't realize it was under tags. Still wondering what made them "insecure".
    – Mine
    May 12, 2014 at 3:49
  • 1
    @Mine For one thing, you can create transactions that create billions of Bitcoins, and that client will accept them without complaint.
    – Nick ODell
    Mar 2, 2017 at 0:47

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