Keep in mind: a network just for Bitcoin poses a few issues. For one, everyone will know if you use this network, that you use it for Bitcoin. Furthermore, it can be more easily banned or prohibited. It would be better if this new network was more generic and e.g. we also had messengers operating through it.
Of course! The more you could do on the network, the better. If you look at GoTenna's slow loss of ground in this area of development (I'm talking about the development and existence in the open, retail markets and not military who already own a ton of unknown tech anyway), you would further understand that such a device would be likely treated as a threat to the existing banking system. I'm actually in fact surprised that TxTenna hasn't met a backlash from the governments (although I think the fact that GoTenna doesn't maintain their products anymore could be taken as an indirect backlash...)
Online banking or traditional banks in general are as reliant on electricity and internet as well, though. I am pretty confident even a brick-and-mortar bank doesn't work without internet connectivity. Did people lose all trust in their bank when they couldn't go there due to blackout? I haven't encountered this so far.
I actually do think people got much more scared of banks whenever they had problems with them. Think India when their banknotes suddenly got taken out of circulation, or think any disastrous event/crisis where the people couldn't take their own money out of their own accounts. In such events, had Bitcoiners had a device as mentioned in the OP, you can only imagine how much ground BTC would earn in front of banks. Over-the-air transactions in an offline environment. It's like solving one of the biggest flaws of the banking system.
Yes, it depends on the frequency and thus on antenna size though. For example very low frequency signals travel insanely far, but have a terrible data rate and require antennas literally the height of someone's home.
I've been looking for its name, but I still got no clue. There was one particular way of communication through radio that was sending the signals up to the sky and then back to Earth rather than horizontally, which extended its range significantly and eliminated the issue of waves being blocked by certain obstacles.
It's certainly possible to build and I'm very interested in the topic. One feasible way is to create a 2.4GHz mesh network using directional antennas. It should be possible by repurposing 2.4GHz routers with a custom firmware and attaching directional / parabolic antennas to them, of course positioned outside. The ranges as far as I know are around 10-20km, so you'd need a few people in every city running one such thing to get a good coverage. That's why I say mesh network.
Here's an unrelated video that shows what off-the-shelf hardware can do in the 2.4GHz band:
https://youtu.be/15JmpVAuzZYInteresting. Wouldn't it be possible for such a device specifically for BTC & messaging (perhaps messaging
on blockchain) to be produced en masse with a very low cost (<$100, perhaps even <$50)? With Ledger's success, I can only imagine how insane it'd be to have a massive mesh network like that specifically run for Bitcoin. The only issue I see is, if people don't get incentivized for using the mesh network, they will probably not keep them up-and-running 24/7. In the event of blackouts that would likely change, but still.
What about a mesh device
with a built-in lincense-requiring radio transmitter/receiver? As far as I know, during disasters ham radio licenses for example are not necessary anymore. Not sure if massive blackouts or power cuts trigger this as well.
Immidiately after any of the examples you provide, the percentage of barter transactions tends to go way up. There tends to be less use for actual money, and more use for tangible goods used to survive, such as food, fuel, and water.
I don't think any kind of "mesh" network is going to work very well when there are many users involved, or when it needs to cover the entire globe (or even large parts of the world). A mesh network greatly increases the chances of a Sybil attack and makes detecting such an attack much more difficult. There are also privacy implications to using radios to use bitcoin, as it would become trivial for anyone in your area to know you are using bitcoin; this is compared to only your ISP knowing you are using bitcoin currently.
I agree with you about the barter part - but I think it's safe to assume that the levels of barter use go significantly up in these kind of events specifically due to the instant distrust in fiat/banking system. If Bitcoin was there to be used
even fully offline, this would change.
About the security & privacy of such an idea, I don't know much so thanks for underlining these issues. It's definitely not
the most reliable thing, although perhaps there is one key solution we just haven't thought about yet.
There are two problems here, first if you can't move your bitcoins you can't sell them off. Second is that if there is such an aftermath you can't use your fiat either so there is no point in selling bitcoin to get another unusable thing!
I think cash would still work, unless people stop trusting fiat at all due to the likely extremely high sudden price changes (black markets & barter) and due to the loss of purchasing power. And if that happens but Bitcoin can still be used, then I think it's a winning situation for BTC. The point isn't selling it for fiat but rather using it as a currency instead.
The problem is range, it is too short. According to google it is between 3 to 28 kilometres (2 to 18 miles).
Besides any "disastrous event" could take out radio towers too making any kind of longer distance communication impossible.
There were some kind of radios that you could transmit over a range of up to .. 200 miles (or kms) as well?
I believe they use the towers (as booster) which is basically a middle man.
Answered this above, still can't find its name. It transmits radio waves vertically rather than horizontally. Not very sure about using towers as boosters.