Figure 7
The top of the figure shows a horizontal band containing several evenly spaced labels, which read from left to right as “Owner requirements”, “B O Q”, “Quantity Estimate”, “Tender Document”, “Bank reports”, and “Program claim and variations”. From this horizontal band, an arrow extends downward and points to a large three-dimensional block. Inside the block, a vertical flowchart is shown beginning with “Block n”. From “Block n”, a downward arrow arises and points to a text box labeled “Hash”. From “Hash”, two arrows extend downward and point to two text boxes also labeled “Hash”. From each of these two “Hash” boxes, two arrows extend downward and point to additional “Hash” boxes. From “Block n”, another arrow extends downward and points to three blocks arranged horizontally and attached together, labeled from left to right “Block n - 1”, “Block n - 2”, and “Block n - 3”. On the left of this block, a text box labeled “Global currency exchange rates and trade policy” is present. From “Global currency exchange rates and trade policy”, an upward arrow arises, turns rightward, and points to a box labeled “Supplier” on the right side. From “Supplier”, a downward arrow arises and points to “Inspection and Transportation”. “Inspection and Transportation” also has a description box labeled “Goods tracking and time prediction”. From “Global currency exchange rates and trade policy”, a rightward pointing arrow arises and points to the block. Below “Inspection and Transportation”, a text box labeled “Finance institutions” is present and points to the block. On the bottom left, a rectangle is shown with six icons arranged vertically, including a person standing behind a podium, three ships, two aeroplane icons, and a network icon. From this six-icon rectangle, a dashed arrow extends rightward and points to a text box labeled “Contractor”. From “Contractor”, an upward arrow labeled “Input” points to three icons arranged horizontally and labeled from left to right “Quality”, “Quantity”, and “Drawings”. Between “Quality” and “Quantity”, a text box labeled “Decision” is attached. From “Quality”, “Quantity”, and “Drawings”, an upward arrow arises and points to the block at the centre. Below “Contractor”, a text box labeled “Subcontractor” is present with an upward arrow pointing to “Contractor” and also has a dashed upward arrow labeled “Labour attendance” pointing to the central block. From “Contractor”, a double-headed arrow extends rightward and points to a box labeled “Consultant (Q S, P M)”. From “Consultant (Q S, P M)”, a double-headed arrow extends upward and points to the block at the centre. From “Consultant (Q S, P M)”, a downward arrow labeled “Report progress” points to a box labeled “Owner”. From “Supplier”, a dashed arrow extends downward and points to “Consultant (Q S, P M)”. The bottom of the figure contains Go source code displayed in two columns. Each of the main process boxes contains a corresponding icon that visually represents the action described.The blockchain private chain supply management process and chaincode