A Bitcoin futures contract is exactly what you would expect from the example above, replacing pork bellies with Bitcoin. It is a contract that enables you to buy Bitcoin at a predetermined price at a specific point in the future. For example, if today’s Bitcoin price is 8,000 USD per BTC and you expect it to rise to 10,000 USD per BTC in 4 weeks, then entering a contract which allows you to buy Bitcoin at 9,000 USD in 4 weeks is highly attractive.
The Funds may invest in forward currency contracts for investment or risk management purposes. A forward currency contract is an obligation to buy or sell a specific currency at a future date, which may be any fixed number of days from the date of the contract agreed upon by the parties, at a price set at the time of the contract. These contracts are entered into on the interbank market conducted directly between currency traders (usually large commercial banks) and their customers. Forward currency contracts may be structured for cash settlement, rather than physical delivery.
In the event an order is cancelled, the Authorized Participant will be responsible for reimbursing the Fund for all costs associated with cancelling the order, including costs for repositioning the portfolio, provided the Authorized Participant shall not be responsible for such costs if the order was cancelled for reasons outside the Authorized Participant’s control or the Authorized Participant was not otherwise responsible or at fault for such cancellation. Upon written notice to the Distributor, such cancelled order may be resubmitted the following Business Day, with a newly constituted Portfolio Deposit or Fund Securities to reflect the next calculated NAV.

To illustrate the point, recall that futures markets are just counterparty contracts. Let's say I want to SHORT the market and profit off a decline in BTC/USD. If I put an order to sell Weekly futures contract at $400, and someone buys that offer, then we have created a futures contract. If it goes down, I profit and he loses, if it goes up, he profits and I lose. However, what if price goes down really fast, and my counterparty only had a little margin backing his position? Well, he gets margin-called when it goes down enough, and the system takes his contract and forces it to be sold to a different counterparty that wants to take the LONG side of my contract.
Note that you could just keep bitcoin on CryptoFacilities waiting to make the trade so you don't have to wait to move the bitcoin you bought over. This is called see-saw arbitrage model, where you keep funds on both exchanges to avoid having to wait. This is fine, but you can't ignore that there is extra capital being used in the play, so it affects your rate of return and capital utilisation. We will not use this method, we will do a full, complete, legitimate arbitrage process.