cashu has a relatively new feature, that allows for partial offline payments. In general, all ecash payments can be done offline, since all it is is giving the ecash stored on one device to another device. [...]
Wow. This is both a hell of a piece to think about, and one that's linked to a couple more (I literally zapped after reading the Stocker piece -- I'd never heard of him either -- and almost took a break before coming back and reading the rest; glad I didn't). [...]
Owning a node has the advantage that If you own some kind of system that earns from satoshis going and coming it surely helps you to mitigate some sats onchain (because you can open a channel directly with the service/exchange) ... But you actually don't need a full node (with all bitcoin blockchain) and 100% online to achieve that.. [...]