I predict most quality relays will require a minimum proof of work to accept incoming events in order to combat spam. Currently it is very cheap to create users (key pairs) and very cheap to send events.

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Good idea to implement something like that, the hashcash system (Adam Back) could be implemented in relays ?

It's a great anti spam signal. Preemptive defensive measures already. I love it!

I think this is a pretty solid prediction. Great work getting i PoW relay setup!