Ang alam ko there is an article published na possible na ang offline transaction sa Bitcoin with the use of Txtenna devices.  Siguro pwedeng maenhance iyang Lora network if they looked into the process kung paano gumagana ang Txtenna or possible baka same system din sila.

I still think the major problem kapag nagkaroon ng offline transaction is the possible double-spending if the owner of the said wallet eh may malicious intent doon sa transaction.