I can't run Bitcoin-Qt 0.80 on Mac OS X 10.8 any more.

It starts up then says "System Error: Database Corrupted". I then click OK, and the program "quits unexpectedly"

How do I start again without losing my wallet. Is it just the wallet.dat file that I need to keep, or others as well if I reinstall? I have encrypted the wallet if that makes any difference to the files I need to keep.

There are lots of BC in the wallet. I can't afford to lose them!!

Is there another program I can use just to open the wallet?

  • What files do I need to delete to get the program working again? I tried deleting everything in "chainstate" directory, it ran for a while then crashed again. There are also "blocks" and a "database" directory. I just don't want to delete anything which is going to make my bitcoins disappear. But I need access to the wallet again obviously.
    – pete smith
    Mar 16, 2013 at 5:07
  • 1
    Do you have a recent backup of your wallet.dat? Any backup within the past 100 transactions would have all your private keys. Mar 16, 2013 at 5:26
  • Were you running 0.7 and upgraded to 0.8? github.com/bitcoin/bitcoin/issues/2305
    – o0'.
    Mar 16, 2013 at 12:56

3 Answers 3


Joric's fork of pywallet can read a wallet.dat, decrypt it with your pass phrase and then you can export the keys. But if it is corrupted and Bitcoin-Qt can't read it then pywallet may fare no better.

Doesn't hurt to give it a try.

  • 1
    Thanks for the suggestion. What I did in the end was import the wallet into blockchain.info/wallet. That worked very well, even with the encrypted wallet.
    – pete smith
    Mar 16, 2013 at 5:43
  • 1
    @petesmith please post it as an answer, for future reference
    – o0'.
    Mar 16, 2013 at 13:00

I had the same issue. What i did is:

  • goto /library/application support/bitcoin/blocks
  • renamed the index folder to index1
  • started bitcoin-qt again

The application started reindexing again but my wallet keys are still there.


You can safely delete any Bitcoin-qt files as long as you let the wallet.dat file stay.

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