Nearly any currency when used in commerce is primarily used as an IOU for time. Due how the POW is designed to ensure immutability of the blockchain it also is

Nearly any currency when used in commerce is primarily used as an IOU for time. Due how the POW is designed to ensure immutability of the blockchain it also is dependent on how cheap it is to generate energy for the people who mine. Comparing it to a bank with fiat a bank usually ensures the consistency of transactions so miners perform this action (and also developers of bitcoin if there are security holes) and your wallet is an account and bitcoin have a transaction cost which is like using a debit card associated with an account.