Hello guy, let's say someone sent me his private key.
is there any way to secure the bitcoin, don't let him to use the bitcoin on the shared private key?
without making a new transaction to the new wallet?
-- no hacking its just security question
Thanks
You can give a BIP 38 encrypted private key, and with the way it works, the password acts as part of the seed phrase so the person can't access the bitcoin without it.
BIP 38 encrypted private keys usually start with 6P...
This is of course assuming that you chose a very strong password with a long length. You can throw in a few UTF-8 characters to guarantee that it won't be broken.