[hythyt]

Its not so easy to stop BTC transactions. There are a lot of forms to make BTC transactions... you could do it with SMS, with GIFS with ofuscated data, via phone, via mail, via twitter... But yes, as celticninja says..." If you are not on the network you cannot make transactions on the Blockchain."

[daly]

By assumption the BTC transactions are firewalled. Transactions can still happen on either side of the firewall but they are not shared.

[tudelo]

Seems like it could be a perfect fit for a widely deployed satellite network system...