SIGN offline payment is a lifesaving design during earthquakes, wars, and communication disruptions, and this point has been severely underestimated.

To be honest, I have read the SIGN white paper several times, and just recently I discovered a point that I had completely overlooked before - offline payments.
The white paper states clearly: “Offline Capability: Support for offline transactions in low-connectivity environments.”

Translated, it means: you can transfer money without the internet.
At first I didn't take it seriously, but later when I talked to a friend who does international rescue, I realized how severe this thing is. He said do you know what is the hardest during earthquakes, floods, and wars? It's not the lack of money, it's that money can't be used. Communication is cut off, the banking system is paralyzed, having a card in hand is useless.