As we have seen above, a futures contract has an expiration date. This is the date on which you can purchase the ton of pork bellies for 1,000 USD – this is called a physical settlement. Alternatively, futures contracts can be settled with cash as well. In these contracts, you receive the difference between the current price of the underlying asset and the price in your contract as cash.
The dates for the period October 1, 2017 through September 30, 2018 in which the regular holidays affecting the relevant securities markets of the below listed countries. Please note these holiday schedules are subject to potential changes in the relevant securities markets. In certain countries (for example, China) some exchanges may have holidays not found in the other exchanges.
Speculating and hedging bitcoin with futures has never been easier. Spot has lower leverage which means you have to risk more of your capital with exchanges. Margin fees are very expensive on Bitfinex and Kraken when you are borrowing funds and paying up to 0.1% per day to be in a position. Futures contracts on the other hand have no holding fees associated. You pay a fee to enter the contract, and you pay a fee to exit the contract. Your profit or loss comes from the change in the price you pay.
The idea is simple; if the future is trading above the underlying asset (Bitcoin) today, we buy the asset and sell the future, thus receiving cash and locking in a profit. Then on the delivery date, we sell the bitcoin to cover the costs of settling the futures contract. For the deal to be profitable, the price difference has to be large enough to cover interest between today and the delivery date as well as all costs fees.

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There's a lot of ins and outs which can get confusing in arbitrage trading. We won't go into the technicals of why futures contracts trade at a premium to spot price. You can read a full explanation here. If it's not of interest to you, all you need to know is that there's a tendency, the further out in time the futures contract expires, for the premium to spot to be higher and higher in nominal percentage terms.