Can I sign a message with an Open-PGP key? I want to prove that I control an address for asset verification. To lawyers that might not even know what a blockchain is.

Signing using the private key of an address does nothing for me, as it doesn't prove I control the address (I could have told someone else to sign their address). Is there a way I can leverage PGP signatures in the signing message?
Signing using the private key of an address does nothing for me, as it doesn't prove I control the address (I could have told someone else to sign their address).


In general, OpenPGP keys and Bitcoin keys are incompatible.

You can sign a message using the private key to sign a message that says "This address, and this PGP key are held by so-and-so."  It's possible to forge this by asking someone else with a lot of Bitcoin to claim that their Bitcoins are yours.

This is a problem that doesn't really have a good solution. You can give them the private key and ask them to derive the public key, to prove that you own that address. However, if you do that, an unethical lawyer could steal your Bitcoins.