The block chain technology is changing the world because centralized project are moving to the decentralized blockchain protocol for the fact that transactions are cheaper, faster, trustless do not need a third party , immutable on the blockchain where records are permanent and can not be tempered or altered, efficient, secure and safe .Yes the block chain has limitations such as scalability, use of too much energy source to mine, long confirmation time,and the network size amongst others. There are new innovation project that have worked on the limitation of the blockchain technology. The Hashgraph is the new technology set to rival the blockchain protocol