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Based on the previous five steps, you should now be able to trace ownership based on the whole history of transaction data and to describe individual transfers of ownership in a secure way by authorizing transactions with digital signatures and identifying user accounts uniquely. However, I have not spent any time discussing how to store all the transaction data that make up the transaction history in a secure fashion. This is the point where the blockchain-data-structure enters the discussion. This step introduces the blockchain-data-structure and explains how it is constructed.