Research on blockchain in crowdsourcing and crowdsensing applications has focused on enhancing trust, transparency, and incentive mechanisms within decentralized networks. By leveraging blockchain’s immutable ledger and smart contract capabilities, these systems can securely record task assignments, contributions, and rewards, reducing the risk of fraud and ensuring fair compensation for participants. Blockchain enables the verification of data quality in crowdsensing applications, allowing reliable aggregation of information from distributed sensors or human contributors. Furthermore, token-based incentive schemes and reputation management systems built on blockchain encourage active and honest participation, while maintaining user privacy and data integrity. Overall, integrating blockchain in crowdsourcing and crowdsensing enhances efficiency, accountability, and scalability of these collaborative systems.