couple of ideas:
1. Let users upload their PGP/GPG public key if they want:
- a message signed with their private key could later be used as a kind of proof of ownership.
- paxum could encrypt all emails sent to users who have uploaded their public key and opted to receive encrypted emails.
2. Publish a paxum public PGP/GPG key.
- sign all emails from paxum using the paxum private key (all emails to users who've opted to receive signed emails). That way those users could immediately identify phishing emails.
3. Add the possibility to block incoming payments from blacklisted accounts or accounts with a high risk rating.
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