Some exchanges offer trading on margin. When such an option is available, Bitcoiners are allowed to borrow funds from peer liquidity providers to carry out trades. The term "liquidity provider" refers to those who are ready to deposit their bitcoins and/or dollars with the exchange for use by others for a certain pre-fixed duration, rate, and amount. For example, say a Bitcoiner wants to buy 20 Bitcoins, anticipating that its price would rise in future and thus hopes to profit by selling them at a later date. If the person does not have sufficient funds to buy the 20 bitcoins, the margin facility allows him to borrow the amount required (20 X the price of bitcoins in USD) from a liquidity provider. When the Bitcoiner chooses to close the position, he needs to repay the amount borrowed plus the interest accrued during this time period. Remember that the amount accrued (loan + interest) needs to be reimbursed regardless of profit or loss at the time of settlement.
(ix) limit-up or limit-down trading halts on options or futures contracts which may prevent a Fund from purchasing or selling options or futures contracts; (x) early and unanticipated closings of the markets on which the holdings of a Fund trade, resulting in the inability of the Fund to execute intended portfolio transactions; and (xi) fluctuations in currency exchange rates.
When rolling futures contracts that are in contango, a Bitcoin Fund may sell the expiring bitcoin futures contract at a lower price and buy a longer-dated bitcoin futures contract at a higher price, resulting in a negative roll yield (i.e., a loss). When rolling futures contracts that are in backwardation, a Bitcoin Fund may sell the expiring bitcoin futures contract at a higher price and buy the longer-dated bitcoin futures contract at a lower price, resulting in a positive roll yield (i.e., a gain).
Simply, the OBV is a remarkable technical indicator that can show us if the real money is really buying Bitcoin or quite the contrary they are selling. What we want to see when Bitcoin is failing to break above a resistance level or a swing high and the Ethereum already broke is for the OBV to not only increase in the direction of the trend, but to also move beyond the level it was when Bitcoin was trading previously at this resistance level (see figure below). Here is how to identify the right swing to boost your profit.

Margin Call - when you run out of bitcoin on your account to cover the contract positions you have taken (your account value doesn't cover the Maintance Margin) you are officially rekt. Some exchanges like CryptoFacilities will merely notify you that you have to deposit more or reduce your positions to increase your margin. Others like BitMEX will liquidate you at this level where the exchange takes over your position to liquidate it into the market to prevent system loss.
In the event that a Fund invests in an Underlying RIC that is not publicly offered within the meaning of the Code, the Fund’s redemption of shares of such Underlying RIC may cause the Fund to be treated as receiving a dividend taxable as ordinary income on the full amount of the redemption instead of being treated as realizing capital gain (or loss) on the redemption of the shares of the Underlying RIC.
Each Fund may invest directly in foreign currencies or hold financial instruments that provide exposure to foreign currencies, including “hard currencies,” or may invest in securities that trade in, or receive revenues in, foreign currencies. “Hard currencies” are currencies in which investors have confidence and are typically currencies of economically and politically stable industrialized nations. To the extent that a Fund invests in such currencies, that Fund will be subject to the risk that those currencies will decline in value relative to the U.S. dollar. Currency rates in foreign countries may fluctuate significantly over short periods of time. Fund assets that are denominated in foreign currencies may be devalued against the U.S. dollar, resulting in a loss. Additionally, recent issues associated with the euro may have adverse effects on non-U.S. investments generally and on currency markets. A U.S. dollar investment in Depositary Receipts or ordinary shares of foreign issuers traded on U.S. exchanges may be affected differently by currency fluctuations than would an investment made in a foreign currency on a foreign exchange in shares of the same issuer. Foreign currencies are also subject to risks caused by inflation, interest rates, budget deficits and low savings rates, political factors and government control.
On top of that, the cryptocurrency market travels at lightspeed compared to other markets. New coins enter the market on a daily basis (in 2016, there were about 550 different coins, today there are about 1,500), and each one has news every day. I’m not doubting your ability to consume and analyze news, but that level of information bombardment will always be more effectively consumed as a group. In these communities, you’ll see members link news and relevant articles about coins you’ve invested in and coins you’ve never heard of. The community will definitely expand your knowledge much faster than doing it all yourself.
You can find additional information about the Funds in the current Statement of Additional Information (“SAI”), dated October 1, 2017, as may be amended from time to time, which has been filed electronically with the Securities and Exchange Commission (“SEC”) and is incorporated by reference into, and is legally a part of, this Prospectus. A copy of the SAI is available, free of charge, online at You may also receive a free copy of the SAI or make inquiries to ProShares by writing us at the address set forth above or calling us toll-free at the telephone number set forth above.
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.