Before continuing you can check if any of your money was stolen by entering your old address in https://explorer.btcprivate.org and see if you notice any weird outgoing transactions.
Check your browsing history
Have you entered your private key on any site different than btcprivate.org?
On what website have you entered your private key?
Website:
Browsing history
To check your browsing history, use CTRL + H (Windows) or Command + Shift + H (macOS)
See if you notice any domains that are slightly different then expected. Things like btcprivate.net instead of .com, or bctprivate instead of btcprivate
Have you sent funds to a wrong address?
Unfortunately there is no way to refund your funds.
Where did you find the address you sent funds to?
What website did you find the address?
Website:
What message was sent to you?
Include details like name of user, platform, etc.
Where did you find the address?
Do you want to report a domain or an address?
What malicious domain would you like to report?
Domain:
What malicious address would you like to report?
Address:
What would you like to report?
Please specify a reason for your report
Captcha
Sending
Thanks for your report
Your report has been sent. In the meanwhile, you can learn how to protect yourself and others in the future: