One of the "Grand Challenges" in spectrum sharing that was identified by leading researchers was automating the enforcement of spectrum sharing [1]. In general, the automation of enforcement has numerous challenges, including the detection of events, gathering forensic evidence surrounding the event, maintaining the security and provenance of the records, and conducting adjudication that is consistent with the extant rights structure [2]. To illustrate this challenge, Shay et.al.[3] conducted a simple experiment surrounding the enforcement of traffic laws. One of the "Grand Challenges" in spectrum sharing that was identified by leading researchers was automating the enforcement of spectrum sharing. In general, the automation of enforcement has numerous challenges, including the detection of events, gathering forensic evidence surrounding the event, maintaining the security and provenance of the records, and conducting adjudication that is consistent with the extant rights structure. This work will be looking at the enforcement aspect in the spectrum sharing regime, especially on ex-post enforcement by using Block-chain technology to automate the ex-post enforcement processes. The potential usages can be divided into three applications which are ex-post enforcement using Block-chain by itself as Publicly-Distributed-Database, ex-post enforcement using Smart Contract, ex-post enforcement as Decentralized Autonomous Organization (DAO)