If you are receiving threatening emails asking for payment in cryptocurrency, here are some steps you can take:

1. Do not pay. Do not pay or respond to the email.
2. Report the email. Report the email to the Police or your local authorities.
3. Secure your computer. Make sure your computer is secure and the latest software updates are installed.
4. Change your passwords. Change all of your passwords and add two-step authentication.
5. Block the sender. Block the sender from your email account and any other online accounts.

If you are unsure who sent you the email, or feel unsafe, please reach out to a trusted relative, friend, or local authorities for help.