user136512: I've bought Bitcoin back in 2014 and as my wallet I've used the bitcoin-qt client. Now I've remembered about it and I've recovered the wallet.dat file, but it's apparently encrypted by me (using bitcoin-qt) and I only remember what word was used for it, but not the whole password.
What I tried is downloading the bitcoin-qt client and tried unlocking the wallet via the console with walletpassphrase "passwordhere" 60 but the password is never correct. I did this offline though.
So my questions would be:

Can I somehow recover my password? Is there maybe a weakness in the encryption or something like that? I found a RPC password in a file, is that helpful in any way to unlock it?
Is it safe to delete the blockchain? If yes, which folders/files? That old PC of mine is lacking space apparently and it certainly can't fit the whole blockchain of today.
Could it be that being offline caused the wrong password prompt?
How could I possibly recover my public address of the wallet? I can see the transaction times, but the not the address apparently.


user104780: 
You can try to brute force the password, trying all the different possibilities for your password, it is also possible to make a script for this task, but only you who know what the password is could give some hints about it. The RPC password may give some hints about the password for the wallet.dat, but it is not really related to the wallet.dat file.

You shouldn't delete the blockchain, because if you want to sync the blockchain in that computer, you should keep the files there, but you could also copy the wallet.dat and move it to another computer with more storage.

No, usually the password encryption doesn't have anything to do with the network, so it is not necessary to be online.

Once you sync your wallet, you will see your balance, you could also use the command listunspent during that process in your QT wallet to see the public addresses which contain some funds.



136512: <p>I've bought Bitcoin back in 2014 and as my wallet I've used the <code>bitcoin-qt</code> client. Now I've remembered about it and I've recovered the <code>wallet.dat</code> file, but it's apparently encrypted by me (using bitcoin-qt) and I only remember what word was used for it, but not the whole password.</p>
<p>What I tried is downloading the <code>bitcoin-qt</code> client and tried unlocking the wallet via the console with <code>walletpassphrase &quot;passwordhere&quot; 60</code> but the password is never correct. I did this offline though.</p>
<p>So my questions would be:</p>
<ul>
<li>Can I somehow recover my password? Is there maybe a weakness in the encryption or something like that? I found a RPC password in a file, is that helpful in any way to unlock it?</li>
<li>Is it safe to delete the blockchain? If yes, which folders/files? That old PC of mine is lacking space apparently and it certainly can't fit the whole blockchain of today.</li>
<li>Could it be that being offline caused the wrong password prompt?</li>
<li>How could I possibly recover my public address of the wallet? I can see the transaction times, but the not the address apparently.</li>
</ul>
 104780: <ul>
<li><p>You can try to brute force the password, trying all the different possibilities for your password, it is also possible to make a script for this task, but only you who know what the password is could give some hints about it. The RPC password may give some hints about the password for the wallet.dat, but it is not really related to the wallet.dat file.</p>
</li>
<li><p>You shouldn't delete the blockchain, because if you want to sync the blockchain in that computer, you should keep the files there, but you could also copy the wallet.dat and move it to another computer with more storage.</p>
</li>
<li><p>No, usually the password encryption doesn't have anything to do with the network, so it is not necessary to be online.</p>
</li>
<li><p>Once you sync your wallet, you will see your balance, you could also use the command <code>listunspent</code> during that process in your QT wallet to see the public addresses which contain some funds.</p>
</li>
</ul>
