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According to this contract, the main contractor can request the client for the amount required for the completion of the created task. Therefore, the main contractor is the only participant who can initiate this contract. The cash state is paired with this contract.

As mentioned in Figure 2.4, this contract requires zero input states and gives one output state. The signatures of the client and the main contractor are mandatory in this contract for a successful transaction. Hence, this transaction is visible only to the client and the main contractor.

Figure 2.4 Representation of the RT contract.

Figure 2.5 Representation of the TT contract.