1. Qualifications and knowledge of the people. Because the majority of people today do not fully understand block-chain and technology. So if you want to use cryptocurrency like paper money today, all people have to know how to use technology
The problem is that poor people, beggars, and those who do not have enough education and many others can affect them to make it difficult to adopt this technology.
2. Smart phones - Must be integrated with technology to make it convenient for people to use
The smart phone will serve as our wallet in the near future. So it is also a requirement that all people have it.
3. Simplification of cryptocurrency developers. How can people easily use like paper money.
More development! which will provide ease of use.