Can 3rd party check the state that he does not know, and add this state in a flow as a input state?

Clash Royale CLAN TAG#URR8PPPCan 3rd party check the state that he does not know, and add this state in a flow as a input state?
Here is my deliverydemo source code on github.
My scenario:
My question:
1 Answer
1
C isn't aware of the existence of the token states, so can't add them to the transaction herself.
Instead, C should ask B to send over the token states she wants to spend, and add them to a transaction.
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