I buy only p2p Bitcoin and by that I mean only Bitcoin for cash. Because of this there is no digital trace.

For arranging a meeting I use nostr:npub1mftv2j67vayavkks8rqev3u8jjhefe86tf80msstfxvpunk9vmps6prkl3 which encrypts all messages and other stuff directly on your device. After the trade, you delete the chat and that’s it.