THE cagliostr requires few resource. Currently cagliostr have about 100 users in Japan.
Another relay written in C++: https://github.com/mattn/cagliostr
The last time someone showed up with a C++ relay it went like this: 
nostr:npub1zl3g38a6qypp6py2z07shggg45cu8qex992xpss7d8zrl28mu52s4cjajh
THE cagliostr requires few resource. Currently cagliostr have about 100 users in Japan.
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