Has anyone thought about this?
Lets say a war breaks out between the US and Russia and/or China, i would imagine that communications will be something that will be affected, the internet in particular.
If trans-ocean cables are damaged or shut down and satellite communications disrupted, how will blockchains be able to sync?
This demands a stable internet globally.
We may be able to use radio links over shortwave radio etc and possibly ham sats, but i think that alternative options need to be explored for the long term stability of blockchain currency.
Any ideas, please share in the comments!