Storing Transaction Data
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.