The Maelstrom-funded work by Ben Allen aims to improve Payjoin, a transaction method that increases Bitcoin privacy by breaking the common blockchain analysis heuristic that assumes all transaction inputs are owned by a single entity.

Quotes that support claims

Payjoin, first introduced in 2019 by Nicolas Dorier in BIP 78, allows both the sender and receiver to contribute inputs to a single Bitcoin transaction.

The assumption they have is that if a Bitcoin transaction has multiple inputs, all the inputs must all belong to the same entity.