표 2. | Table 2. 주파수 이용정보 거래 시스템의 구성요소 및 역할 | Components and roles of the frequency usage information trading system.

Node	Component	Role
Frequency use buyers	USER()	Coin payment
		Purchase available channel information
Certification agency	MINER()	Database administration
		Generation and management of propagation map
		Mining
Sensing data sellers	OWNER()	Sensing data collection
		Sensing data sales