  Denial of Service (DoS) attacks are a growing threat in network services. The
frequency and intensity of DoS attacks are rapidly increasing day by day. The
immense financial potential of the Cryptocurrency market is a prevalent target
of the DoS attack. The DoS attack events are kept on happening in
cryptocurrencies and the blockchain ecosystem. To the best of our knowledge,
there has not been any study on the DoS attack on the blockchain ecosystem. In
this paper, we identify ten entities in the blockchain ecosystem and we
scrutinize the DoS attacks on them. We also present the DoS mitigation
techniques applicable to the blockchain services. Additionally, we propose a
DoS mitigation technique by the use of verifiable delay function (VDF).
