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[vinca BK.]

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[baro77]

I'm thinking to mesh broadcasting of cryptos  since a while.... your idea seems a special case for that... Till now I have thought of 3 major problems:

1) regulations... EM spectrum it's not availabale, best frequencies are already used and anyway subjected to licensing all almost all over the world
2) long-reaching frequencies (lowest ones) need bigger antennas, so you have a tradeoff between distance of relaying nodes and the possibility to install them or make them mobile and concealable
3) scalability problems of mesh networks... they work good when they are crowded, and noone is contributing to/using them if they don't work effectively

the only BTC-over-RF global project I know is Blockstream-SAT: that's cool and useful for sure for digital-divide zones, but the internet-to-sat supply chain constitutes a point of centralization 

[odolvlobo]

Blockstream satellite network: https://blockstream.com/satellite/

[NotATether]

While not directly related to satellites, your WiFi card technically works by sending frequencies so that could be "hijacked" to beam the broadcast over to some weather balloon-looking device in the nearby stratosphere. This enables it to work with existing computers without having to worry about full-node storage for satellites, or how the satellites are being deployed extremely non-uniformly across the world.

[Quickseller]

A mesh network will make the network more susceptible to Sybil attacks. The current status quo is that nodes can connect to a geographically diverse set of nodes. A mesh network would mean that all nodes a user connects to must be local, and this means an attacker could generate many nodes concentrated in a particular area to have a high chance of pulling off a successful Sybil attack.

A mesh network would also make it difficult to the network to reach across continents, or even cities. A mesh network spanning a large area would result in bottlenecks when data needs to go through sparsely populated (which means fewer nodes) areas.   

[Theb]

Radio Waves/Frequencies are not the most secure way as it is very vulnerable to data siphoning and hacks as it is broadcasted to everyone not on a particular network. So this isn't really a safe alternative of broadcasting transactions besides that privacy will be an issue here as assuming that the transactions are being broadcasted people can track the transactions easily especially the authorities who have the capability of pinpointing your location via the use of radio waves.