The nature of money has evolved for a millennia and has now become fully digitized. Thousands of years ago, a bank account -- if you can call it that - likely consisted of a bag of coins or shells that were stashed away safely. During the Middle Ages, the double-entry accounting system was established, signaling the emergence of payments and the double-entry ledger then became the norm. This supported the movement of money across great distances. It also enabled money to be stored safely with a central party who could track and access those funds at different locations. This also facilitated the concept of credit, effectively paving the way for modern-day banking.