In Section III-B, it is mentioned that pinning command permanently store files, on the contrary, the status from store permanently to temporary can be changed by using ipfs pin rm command. As a consequence, in the deletion process, unpinning files is necessary if the files are ready to be deleted. IPFS Cluster will perform unpin procedure among every single node in cluster swarm and the status of the specific file will be marked as unpinned in each local IPFS directory. Afterward, the node that starts this deletion process performs garbage collection procedurefirst to remove all unpinned files on local IPFS directory simultaneously. After performing the deletion, node A generates a current File Authentication Code named FAC which functionality is similar to Message Authentication Code (MAC). Applying SHA-256 to perform hashing with all the file hashes (file names) in local IPFS directory, the FAC of this IPFS node will be obtained.