During a hackathon 7 years ago, a team and I set out to make a decentralized blockchain messaging platform over Bluetooth Low Energy. It was intended for situations when the internet was out. We didn't finish the technicals in 24hr, but it was a fun challenge. I looked it up and there are a lot of solutions now, here is the top one on search: https://github.com/permissionlesstech/bitchat
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