i've read somewhere that bitcoin is considered commercial and ham radio does not allow commercial broadcasts

Taranis

>Why would encryption be used?

Good point. I suppose it would not be allowed for other reasons such as being considered "commercial" as mentioned in the other reply.

VzxPLnHqr

Why would encryption be used?

Also, I forgot one.  Somewhere I remember seeing someone toss out there this method for broadcasting blocks:

https://en.wikipedia.org/wiki/Earth%E2%80%93Moon%E2%80%93Earth_communication

cointastical

bitcoin

thought experiment: how to keep full node in sync without traditional internet?

Thanks for the links. 

Ultimately it seems that while these projects might at some point be a part of the resilience of the bitcoin network, at present the network has simply not been tested/attacked enough to cause more nodes to operate outside the traditional wires. 

Couple that with the per-usual challenges of government making it difficult (apparently encryption is not allowed over amateur radio).