Blockchain-Based Crowdsourcing Framework with Distributed Task Assignment and Solution Verification

Table 3

Comparison of crowdsourcing schemes.

Characteristics	Schemes
	[17]	[9]	[18]	[12]	Our scheme
Reliability	×	×	√	√	√
No trusted third parity	×	×	×	√	√
Resist free-riding attack	×	√	×	×	√
Resist false-reporting attack	×	√	√	√	√
Resist collusion attack	×	×	×	×	√
Task matching mechanism considering workers’ preference	×	×	×	×	√
Solution evaluable	×	×	×	×	√