Could this be combined with a main chain payjoin? Consolidate several UTXOs from payer and merchant into one output UTXO. Payer gets all their change as eCash?
Dove into NUT-11 P2PK over this Sunday, it's pretty cool. You can lock a token to a public key so only its owner can claim it. Got me thinking about designing this into #eNuts. Still wrapping my head around the more advance bits like multisigs and timelocks. More to come!
Note: this is just a prototype, this feature doesn't yet exist in eNuts. Still needs a lot of consideration, but you can check out the NUT-11 documentation and try out eNuts on Testflight!
Docs:
https://github.com/cashubtc/nuts/blob/main/11.md
eNuts:
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