Crowdsourcing provides a distributed problem-solving paradigm which is not the same as traditional outsourcing computation. These systems are generally centralized platforms which match the requesters’ and workers’ task pair with fair exchange of rewards. Blockchain technology has attracted considerable attention due to the boom of cryptocurrencies and decentralized applications. Among them, the emerging blockchain-based crowdsourcing is a typical paradigm, which gets rid of centralized cloud-servers and leverages smart contracts to realize task recommendation and reward distribution. Blockchain-based crowdsourcing systems can mitigate some known limitations of the centralized crowdsourcing platform, such as single point of failure and Sybil attacks. This SlideShare explores the concept of Blockchain in crowdsourcing data in brief.