My point is that Crypto stored on Cell Phones will function almost as well as Cash during Short , keyword
Short Power Outages.
With Car Chargers , the mobile phone can easily last until the cell towers backups run out of power.
Because the short ones , internet is still accessible from the Cellphone, and those cell towers have emergency power backups already in place.
Cash has to be drawn out before the power fails, as the ATMs die with the electricity and the banks will not open for the public until the power comes back on.
Hurricanes, Floods, Tornado all can cause short term problems, but they are short term and there is usually a place with power & communications within driving distance.
So the Fear that would grip a person, and cause them to revert to stone age civility does not occur.
A True EMP crash sends us back to Stone Ages, it won't be 3 months before we are back to our present standard of living.
More like Generations, as most knowledge is stored in electronic format and libraries with Actual Books are dying.
The People that can help rebuilt from this may die in a disease outbreak or the violence that follows way before their skills can be used.
Plus many people think , no problem, we just live like people used to, what they don't understand , is that even the way people lived in the early 1900s,
there was a functioning infrastructure, with people knowing what was required of them to make a living.
Example :
In our Neighborhood growing up , there was a guy traveling around, with a donkey pulling a cart with salt, cooking utensils, clothes and most everything people needed.
Back when Sears & Robuck gave door to door service. 
He would take cash or barter with you for crops/food or home made cloths and then visit the city to trade with them or buy supplies to sell back to the country people, these people made living easier for the City & Country people, if our current infrastructure collapses, it will be some time before the new systems can compensate, especially if we reset backwards technologically 100 years or more. It will take time before people can develop the expertise needed for these systems to work.
There is really only 3 scenarios that favor cash over crypto.
1. Governments outlaw it, doubtful because they are secretly promoting it with negative interest rates
2. Electricity networks are working normally , but the internet & all long distance communications itself is destroyed.
(Internet was designed to withstand a Nuclear War, so odds are it will survive as long as their is electricity.)
3. Quantum computers actually can break any encryption in seconds meaning no crypto is safe.
(Also Doubtful, we just use a quantum computer to create the next encryption. )
These 3 Scenarios that favor Crypto over Cash.
1. Governments use Negative Interest Rates on Banks Deposits , & charge more if you use Cash. ( 1st part has already happened.)
2. Your Country Defaults on international payments making their Fiat worthless. (Venezuela is happening now, & the US is so far in Debt , it will never be paid off.)
3. Business go cashless, as a way to save money and hold onto Profit. (This has also already begun to happen.)
FYI:
On the EMP side of things, we need to start hardening our electronics to protect them from an EMP pulse.
As it has already happen in 1859.
https://en.wikipedia.org/wiki/Solar_storm_of_1859Carrington flare
From August 28 to September 2, 1859, numerous sunspots were observed on the Sun. On August 29, southern auroras were observed as far north as Queensland, Australia.[5] Just before noon on September 1, the English amateur astronomers Richard Carrington and Richard Hodgson independently made the first observations of a solar flare.[6] The flare was associated with a major coronal mass ejection (CME) that travelled directly toward Earth, taking 17.6 hours to make the 150 million kilometre (93 million mile) journey. It is believed that the relatively high speed of this CME (typical CMEs take several days to arrive at Earth) was made possible by a prior CME, perhaps the cause of the large aurora event on August 29, that "cleared the way" of ambient solar wind plasma for the Carrington event.[6]
Because of a geomagnetic solar flare effect ("magnetic crochet")[7] observed in the Kew Observatory magnetometer record by Scottish physicist Balfour Stewart and a geomagnetic storm observed the following day, Carrington suspected a solar-terrestrial connection.[8] Worldwide reports on the effects of the geomagnetic storm of 1859 were compiled and published by American mathematician Elias Loomis, which support the observations of Carrington and Stewart.
On September 1–2, 1859, one of the largest recorded geomagnetic storms (as recorded by ground-based magnetometers) occurred. Auroras were seen around the world, those in the northern hemisphere as far south as the Caribbean; those over the Rocky Mountains in the U.S. were so bright that their glow awoke gold miners, who began preparing breakfast because they thought it was morning.[6] People in the northeastern United States could read a newspaper by the aurora's light.[9] The aurora was visible as far from the poles as Sub-Saharan Africa (Senegal, Mauritania, perhaps Monrovia, Liberia), Monterrey and Tampico in Mexico, Queensland, Cuba, Hawaii,[10] and even at lower latitudes very close to the equator, such as in Colombia.[11] Estimates of the storm strength range from -800 nT to -1750 nT.[12]
Telegraph systems all over Europe and North America failed, in some cases giving telegraph operators electric shocks.[13] Telegraph pylons threw sparks.[14] Some telegraph operators could continue to send and receive messages despite having disconnected their power supplies.[15]
On Saturday, September 3, 1859, the Baltimore American and Commercial Advertiser reported, "Those who happened to be out late on Thursday night had an opportunity of witnessing another magnificent display of the auroral lights. The phenomenon was very similar to the display on Sunday night, though at times the light was, if possible, more brilliant, and the prismatic hues more varied and gorgeous. The light appeared to cover the whole firmament, apparently like a luminous cloud, through which the stars of the larger magnitude indistinctly shone. The light was greater than that of the moon at its full, but had an indescribable softness and delicacy that seemed to envelop everything upon which it rested. Between 12 and 1 o'clock, when the display was at its full brilliancy, the quiet streets of the city resting under this strange light, presented a beautiful as well as singular appearance."[16]
In June 2013, a joint venture from researchers at Lloyd's of London and Atmospheric and Environmental Research (AER) in the United States used data from the Carrington Event to estimate the current cost of a similar event to the U.S. alone at $0.6–2.6 trillion.[2]
FYI2:
Where as i can hoard FIATIt will have two advantages over Crypto in an EMP Scenario, you can burn it to stay warm or wipe your butt with it .
(Or you could just use pine straw or corn cobs instead.)
(Roman Empire info, they used a Sponge on a Stick in a bucket of Salt Water.)
FYI3:
Within 12 to 18 months, experts predict, 90 percent of Americans would be dead. ... 90 percent of all Americans would die within 12-18 months of an EMP.
