What about making a community peer to peer marketplace for goods and services that trades directly on blockchain without the need for an escrow service?

The problem
The currently available peer to peer marketplaces are just a centralized list of items for sale that accept crypto for payment. These need to use an escrow service that make the seller wait for a long period of time before receiving the payment for the item they sold.

The solution
Using a full blockchain proof of reserves to verify the marketplaces reserves as well as obligations in real time. This will reduce marketplace friction by allowing sellers to receive instant payment for their sold items and also allow both buyers and sellers to be confident that the marketplace is fully solvent at all times.