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This question already has an answer here:

My guess is that there is that you are able to leave the transaction parameter empty, but I have not been able to find confirmation.

marked as duplicate by Nate Eldredge, cdecker, Stéphane Gimenez, Salvador Dali, Murch Feb 4 '14 at 9:07

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    Indeed, there is no requirement that a block contain any transactions besides the coinbase. The ultimate reference is the source code. – Nate Eldredge Feb 4 '14 at 4:30

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