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Figure 2.12 Working flowchart of the solution.

The roles of the participants can be described with the help of the flowchart in Figure 2.12.

The Client: This entity can transfer money to the main contractor. This participant is involved in all the possible transactions of the flowchart so that he/she can keep track of how and where the money is being spent.

The Main Contractor: This entity can create new tasks and assign them to the subcontractor, along with a deadline, and then request the client for the money that is required for the completion of the assigned task. This participant can be assumed as the bridge linked to the client and the subcontractor.

The Subcontractor: This entity should update the status of the assigned task so that it can be inspected by the concerned people. This participant should do so before the given deadline so that no strict action can be taken for the delay.

This solution model uses a single notary due to limited participants and all the participants must have an account on the online platform that is provided.