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 Yes, nostr relays get those ecash stamp. 

We think there is no long-lasting free lunch. So we learn from postal system. Ecash is best e-stamp. relay will be post office, which has income to cover cost. 
 Cool, perhaps you could consider layering the post stamps if you want to pay the ISP as well :) 
 Yes, it’s possible. Bitcoin ecash as estamp is general solution. 
 Very good thinking! I wonder, would it be possible to also onion-route the messages using multiple relays? 
 I think it is possible. Give all relays who routed the message bitcoin ecash. Just like using 10 letter envelops, every envelop has one stamp. 
 Yes, the protocol just needs to understand "forward to relay" instead of "forward to user".