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According to this contract, the subcontractor can update the status of the task that was assigned to him by the main contractor. Therefore, the subcontractor is the only participant who can initiate this contract. The task state is paired with this contract.

Figure 2.6 Representation of the UOT contract.

As mentioned in Figure 2.6, this contract requires one input state and gives one output state. The signatures of the client, the main contractor, and the subcontractor are mandatory in this contract for a successful transaction. Hence, this transaction is visible to all three participants.