Motivation. By building out P2P encrypted communication between the sender and the receiver of a payment without changing the existing base layer user workflow, the learning curve of Lightning Network, PayJoin, merge avoidance and some other schemes would be radically reduced, because the user experience would be unified, the robots would handle the heavy lifting.
Background A taproot script exposes the public key, which is essential for this scheme.
Expected Existing Workflow. Receiver gives Sender a taproot Bitcoin address, which has a corresponding public key. Sender sends bitcoins to the address.
Problem. How can we build up P2P encrypted communication between receiver and sender without disrupting the existing workflow?