Reimagining US Currency for the modern age. Most Americans already use some for of debit card and online bankings, so while now have this system be integrated into how we handle currency?
The system consisted of having a digital first banking solution; all of you funds would be connected to one hub account, and additional ones (banks, credit cards) could be added to main account. You can view your account on any device, and using this web enabled service, can also send people money digitally.
As a fallback solution, there is also a physical debit card which can be used, in addition to being able to print out one-time use unique vouchers for people who don't have access to technology or prefer a hard copy for their records.