I couldn't figure out how to get your pubkey from the blockchain in your transactions.
My original thought was to use that, but it's bad crypto to use the signing key for encipherment (along with every other bad reason). Hope this helps!
Here's a quick python script to convert that pub key to something you might recognize:
https://imgur.com/a/kTr3qkS. So we publish our pub key to the block chain on every tx.
When you expose the pub key, it's a privacy issue. But more importantly, if there's a weakness discovered where the priv key can be found with the pub key, your funds are protected.
A few msgs coming. When you spend money, you have to publish the pub key in the scriptSig of the tx. That's why we have change addresses for EVERY tx: because you expose the pub key.
