What is the most interesting thing in Blockchain and Cryptocurrency?
The most interesting thing about Blockchain and Cryptocurrency is the level of control it gives to users.
I'll give you an example: when you buy a car, you have to go through a dealership that is going to charge you for their services. But if you were to buy a car using cryptocurrency, then you'd be able to do so without paying any fees.
This means that people who purchase cars using cryptocurrency are getting more value for their money than those who don't use crypto. They can save money by not having to pay fees or taxes on top of the price of the car itself.
Another example could be buying groceries at a supermarket—you would be able to get all the food you need without having to pay any extra fees for doing so.