Thx for the warning. I was suspicious too 

Doesn't know anybody an advice?

Thx for your answer, but like i wrote i cant start the client after I replaced the wallet.dat

Hi guys,

I mined some BTC in 2011.
Then I did nothing withem beside doing a backup of wallet.dat and uninstall the bitcoin client.

Now after years i reinstalled bitcoin core client, download the whole keychain and replace the wallet.dat (2017) with my backed up one (2011).
When I start the client i get an error: "Ein schwerer Fehler ist aufgetreten. Bitcoin kann nicht stabil weiter ausgeführt werden und wird beendet"

Then I run the bitcoin core client again with -reindex -research parameter...it took a while...and then I get displayes there are no BTC in the walltet but also no transactions.
After run it without -reindex -research I get the error again

I tried a reinstall of the client but nothing changed.

Do you know any help?


Is it save to upload the wallet to blockchain.info?
If i upload it to blockchain.info the he hoster of the webseite have access to my wallet, haven't he?