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 what is ecash for?  when we have satoshis etc. I don't understand why we have it.

anyone explain this simply? 
 asynchronous payments

lightning is synchronous

you can't send to someone's LN address unless there is a server answering there

ecash lets you send a payment like lightning except that it's less anonymous (to the mint) without the recipient being online

mutiny, and some other projects are using this as a bridge to cope with intermittent connectivity for non-custodial lightning payments 
 Yeah, THIS.  Its not about privacy improvements, IMO.  Its about 1) sending money directly to someone, instead of asking for an invoice, 2) not having to deal with lightning channel liquidity management, and 3)assuming people are using the same mint ,  no more "can't find path" LN payment failures to deal with.

Plus, ecash can be minted that is linked to someone's npub, and that is really powerful too. 
 yeah, it's just less anonymous than lightning or bitcoin, and i feel it's important to point that out, the mint knows who makes tokens and who spends them by their IP address 
 thanks nostr:nprofile1qqsyeqqz27jc32pgf8gynqtu90d2mxztykj94k0kmttxu37nk3lrktcpz9mhxue69uhkummnw3ezumrpdejz7qg3waehxw309ahx7um5wgh8w6twv5hsz9thwden5te0wfjkccte9ejxzmt4wvhxjme0swcf2c