implement NIP-70: protected events

[fiatjaf]

a simple change can maybe fix the world.

proposal here: nostr-protocol/nips#1030

(this code is broken and I don't know how to fix it, but hopefully it conveys the idea the code was fixed by @v0l now works wonderfully)

[v0l]

Could add 70 here:

strfry/src/apps/relay/RelayWebsocket.cpp

Line 51 in c0dec7c

tao::json::value supportedNips = tao::json::value::array({ 1, 2, 4, 9, 11, 12, 16, 20, 22, 28, 33, 40 });

[hoytech]

Thanks!