How to make a "tipping application"

Here’s my goal:

Allow users within an instance to send eachother “tip”.

Allow users to enter, say, a bitcoin address in their settings – or maybe just put it in their self-description which could be parsed.

Under every toot there is a “reply boost favorite more” row of controls. For users who have set up such an address, the “more” popup would have one extra “tip” option. When a user clicks on this popup, and perhaps they’d be redirected to a different site, or some more UI would allow them to finish creating the tip.

Here are some toot thread on the subject: