On-chain zaps and silent payments don't solve the problem that Nostr is a marketplace completely starved of liquidity and monetary velocity because the money it uses is so hard that nobody wants to sp...
And it'll always be that way because nostr merchants are unlikely to spend 100% or even most back into the nostr economy, so it'll always be draining out. Maybe a solution is to integrate with some easy option to convert fiat to bitcoin.
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