I think you do not understand what is ecash... is just a token, a "giftcard" with sats. And can only redeemed over LN.
https://darthcoin.substack.com/p/bitcoin-adoption-using-ecash
nostr:npub1lxktpvp5cnq3wl5ctu2x88e30mc0ahh8v47qvzc5dmneqqjrzlkqpm5xlc does minibits or enuts receive on-chain?
Discussion
And it works super well. I guess first find a lightning swap service and generate a LN invoice to get tokens