Transaction

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<div class="post"><br/>You can act on a transaction before it is included in a block.<br/><br/>So you can still check for double spending in all the transactions you can see already.<br/><br/>So to buy 2 snacks with the same coin you'd have to spend it at 2 distant nodes simultaneously and get your snack faster than the network propagation time.<br/><br/>So vending machines are easily possible and the scope of the attack is actually quite limited?</div> text/html