UMA Auth was built using Nostr Wallet Connect (NWC), a protocol developed by the team at  nostr:npub1getal6ykt05fsz5nqu4uld09nfj3y3qxmv8crys4aeut53unfvlqr80nfm NWC now supports UMA features like cross-currency transactions and client app registration.

https://bitcoinmagazine.com/business/lightspark-announces-new-bitcoin-l2-and-upgraded-uma-capabilities

nostr:note1hqzkw0p94wekahs0fktt64vd9rc0z9vfet0lnahrmxkrruwajjls6uaj5f