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If the message contains a question then it is an answer, if not I can see that being acknowledgent of receiving it.

The word "ok" is the same. Ok what? Ok you received it or ok you agree with the contract?

There was a call to action, not a question: 'please confirm flax contract'. The thumbs up could easily be interpreted as 'understood, will confirm', and personally that'd be my interpretation, given the situation. It seems especially likely if there wasn't much of a delay before the response was sent (sufficient time to adequately review the contract).

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