Methods and system of preventing duplication of encrypted data

Abstract

Method prevents duplicate data to be stored in storage having hosts which do not trust each other. The method includes storage including encrypted data blocks, network further including distributed ledger, accessible to each of two or more hosts. The method includes steps, performed by first host when the first host wishes to store a new data block, obtaining first hash value for new data block, determining if first hash value is found in ledger. If first hash value is not found in ledger, creating set of confirmation data, encrypting new data block with block-unique encryption key, and storing first ownership record in ledger. If first hash value is found in ledger, obtaining information about second host that has already stored previous block identical to new data block, entering in ledger key request, receiving from ledger key transfer record, sending to ledger new ownership record.