دانلود Blockchain Challenges and Opportunities: A Survey

Abstract

Blockchain, the core mechanism in Bitcoin, has received extensive attentions recently.  Blockchain  serves  as  a  public  ledger  and  transactions  stored  in blockchain are nearly impossible to tamper. Blockchain has the key characteristics such as decentralization, persistency, anonymity and auditability. Blockchain help to improve efficiency and security. It could be applied into many fields including financial  services,  reputation  system  and  public  services.  However,  there  are still  a  large  number  of  technical  challenges  prohibiting  the  wide  application of  blockchain:  scalability  problem,  privacy  leakage  etc.  This  paper  presents a  comprehensive  survey  on  blockchain  technology.  In  this  paper,  we  present a  comprehensive  survey  on  the  state-of-the-art  research  efforts  on  blockchain technology. In particular, we first give an overview on blockchain technology. The typical blockchain consensus algorithms are then introduced. We next present a survey on blockchain applications and technical challenges as well as recent advances. Finally, future research directions are also discussed.