Peer to peer chat without using a server? We can do this using Ethereum's whisper library. This is a chat protocol that lets nodes chat with each other directly, no need for a central server. It doesn't even use a centralized routing source to let nodes discover each other like BitTorrent does with trackers, instead it uses a distributed hash table as a tool for decentralized peer discovery. Yes its not completely real-time, but the trade-off allows for true private chat. I'm going to explain how it works and code the demo at the end.

Code for this video:
https://github.com/llSourcell/Decentralized_Chat

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More learning resources:
https://ethereum.stackexchange.com/questions/127/what-is-whisper-and-what-is-it-used-for
https://hackernoon.com/our-progress-on-ethpay-encrypted-chatting-via-whisper-6a9550ef036a
https://github.com/ethereum/go-ethereum/wiki/How-to-Whisper
https://github.com/ethereum/wiki/wiki/Whisper

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