This is a proof-of-concept NFT marketplace on the XRPL ledger.
Ruby on Rails backend, with a Postgres database.
React on the frontend.
This site is currently hosted at https://nftdemo.herokuapp.com. To interact
with the app, you must be using the XUMM smartphone app and be connected to
the XRPL NFT sandbox: xls20-sandbox.rippletest.net.