You must be able to write a digital check
You should be able to fill in the amount of money that you want to pay onto some sort of digital form
This form can be easily transferred to another party
There must be a record of this transaction
Digital cash should last forever
You should be able to store it somewhere safe for years and then be able to retrieve it for use
It should not expire
It should maintain value until lost or destroyed provided that the issuer has not debased the unit to nothing or gone out of business
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