The underlying asset of all currencies is gold, which can be said to be the consensus of people regarding money. However, due to the impracticality of carrying gold, different countries have developed their own paper currencies. Therefore, the foundation of currency should be the consensus of humanity rather than the credit of nations. Now, people need a portable 'gold', which is why Bitcoin was created.

This is the fundamental logic behind investing in Bitcoin. Understanding this will enable you to hold onto Bitcoin $BTC.