Bitcoin Forum

I hope someone can help me. I have a bitcoin stored in a Bitcoin QT wallet from 2013 on my computer but have forgotten my passphrase. I entered my 17 word wallet recovery mnemonic on https://blockchain.info/wallet/forgot-password and it gave me a password which I may have used, however when I enter this in the Bitcoin QT wallet it does not unlock the wallet.

Is there a way of recovering the passphrase using this mnemonic?

These are 2 differant things, the bitcoin-qt is not related to blockchain.info in anyway.  your Bitcoin-qt on your computer will just be encrypted with a password that you will have set.  do you have bitcoin on the blockchain.info site?  if so the the recovery mnemonic will only work on there online wallet.

If you set a very strong password on a Bitcoin core wallet consisting of both lower and upper case letters, numbers, and special characters there's no way of recovering the password unless you can remember some parts of it.

On the other hand, if you set a weak password of just lower case letters, and can remember some details like its approximate length, or some characters it contains, then someone runs a password recovery service that might be able to help.

These are links to its bitcointalk thread and website. He charges a fee for password recovery, but seems trustworthy. He's been running the service for years now.

https://bitcointalk.org/index.php?topic=239665.0

http://walletrecoveryservices.com/

In 2013 Bitcoin-Qt did NOT use a 17 word wallet recovery mnemonic.

Are you sure you were using Bitcoin-Qt back then and not some other wallet (such as Blockchain.info or Electrum)?

If you were using Bitcoin-Qt, then where did you get your 17 word wallet recovery mnemonic from?  You didn't get it from Bitcoin-Qt.