

Well, you will find the answer as you read along.
In fact, Satoshi Nakomoto himself did not intend to create virtual money.
This is an internet-based exchange medium where the transaction takes place on the blockchain ledger.
To be even more precise, it is immune to the old ways of government’s control and interference.
Yes, the primary function of the nodes is to verify the transaction and make sure that the money is not spent twice.
Hence all the nodes now know which bitcoin was spent and which still remains unused.





