There is no reason why you need to transmit any transactions. In fact your best chance of executing a double spend is similar, these kind of attacks are called finney attacks.<p><a href="http:&#x2F;&#x2F;bitcoin.stackexchange.com&#x2F;questions&#x2F;4942&#x2F;what-is-a-finney-attack" rel="nofollow">http:&#x2F;&#x2F;bitcoin.stackexchange.com&#x2F;questions&#x2F;4942&#x2F;what-is-a-fi...</a>