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 nope, that works over https with the Cashu mint 
 So you say if the relay is closed down, I connect to a new relay I still be able to send my cashu tokens as LN to a LN wallet? I thought the relay funds and minted cashu tokens was tied to the relay and transfered between relays through LN. 
 Cashu works independent of nostr. Even if nostr goes down, you can get your sats out by talking to the mint. 
 Oh, yea, I get that.. 
I misunderstood the discussion.

I was wondering if the MINT disappear, then my tokens is useless? Or am I wrong here as well?

If the Mint I have tokens on goes down, stops being alive. My tokens is gone and I can't send them somewhere via LN? 
 Yes, it's custodial. 
 Do you know if someone is working on implementing the communication between the client and the ecash mint using #nostr relays instead of https?

Something like nostr:nprofile1qqszm52qe2qdkc4u7dma0klx3532jka2g8geck6fwxncyp90wktq2xspp4mhxue69uhkummn9ekx7mqprpmhxue69uhhwetvvdhk6efwdehhxarj9emkjmn9qy28wumn8ghj7un9d3shjtnyv9kh2uewd9hsy47788 does to communicate a client and a wallet.

🫂 
 yes we are working on a solution that is more general and will be useful for other applications as well  
 Nice!!
So a ecash mint could be 'pure nostr', being just a npub, with no need to publish a HTTPS endpoint.

+ Ecash client and mint talking through nostr.
+ Nostr Social client and ecash client talking through nostr ( nostr:nprofile1qqszm52qe2qdkc4u7dma0klx3532jka2g8geck6fwxncyp90wktq2xspp4mhxue69uhkummn9ekx7mqprpmhxue69uhhwetvvdhk6efwdehhxarj9emkjmn9qy28wumn8ghj7un9d3shjtnyv9kh2uewd9hsy47788 model).
+ Nostr client becoming an ecash client with 'nostr ecash' ( nostr:nprofile1qqs04xzt6ldm9qhs0ctw0t58kf4z57umjzmjg6jywu0seadwtqqc75spzpmhxue69uhnzdps9enrw73wd9hszynhwden5te0wp6hyurvv4cxzeewv4eszynhwden5te0wfjkccte9enrw73wd9hsxv8qkt work) 🤯
+ Sending (public) zaps through nostr.
+ Sending (private) P2P payments through nostr.
+ ...

Looking forward for the future!!
Nostrify the world! 💪

Thanks for your work!
🫂