Fixed margin will isolate your margin to the individual position you have made in an instrument. So if you have 1 bitcoin in your account and you put 0.2btc margin for a Weeklies Futures long position, and it gets margin-called, you still have the 0.8btc left. However, if you're on cross-margin, also known as portfolio value margin, then your whole balance on the site is going to be used to back all your positions, and if you get margincalled, it's because you have run out of money on your whole account.
ProShare Advisors is responsible for substantially all expenses of the Unitary Fee Funds except for: (i) brokerage and other transaction expenses and other fees, charges, taxes, levies or expenses (such as stamp taxes) incurred in connection with the execution of portfolio transactions or in connection with creation and redemption transactions (including without limitation any fees, charges, taxes, levies or expenses related to the purchase or sale of an amount of any currency, or the patriation or repatriation of any security or other asset, related to the execution of portfolio transactions or any creation or redemption transactions); (ii) legal fees or expenses in connection with any arbitration, litigation or pending or threatened arbitration or litigation, including any settlements in connection therewith; (iii) compensation and expenses of the Independent Trustees; (iv) compensation and expenses of counsel to the Independent Trustees, (v) compensation and expenses of the Trust’s chief compliance officer and his or her staff; (vi) extraordinary expenses (in each case as determined by a majority of the Independent Trustees); (vii) distribution fees and expenses paid by the Trust under any distribution plan adopted pursuant to Rule 12b-1 under the 1940 Act; (viii) interest and taxes of any kind or nature (including, but not limited to, income, excise, transfer and withholding taxes); (ix) fees and expense related to the provision of securities lending services; and (x) the fee payable to the Adviser. The internal expenses of pooled investment vehicles in which a Unitary Fee Fund may invest (acquired fund fees and expenses) are not expenses of such Unitary Fee Fund, and are not paid by ProShare Advisors. The payment or assumption by ProShare Advisors of any expenses of a Unitary Fee Fund that ProShare Advisors is not required by the investment advisory and management agreement to pay or assume shall not obligate ProShare Advisors to pay or assume the same or any similar expense of such Unitary Fee Fund, on any subsequent occasion.

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Provide a list or diagram of all persons directly or indirectly controlled by or under common control with the Registrant. For any person controlled by another person, disclose the percentage of voting securities owned by the immediately controlling person or other basis of that person’s control. For each company, also provide the state or other sovereign power under the laws of which the company is organized.
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).

It is also possible that other digital currencies, typically referred to as “alt-coins”, and trading systems could become more widely accepted and used than Bitcoin. In particular, the digital asset “ethereum” has acquired a substantial share of the cryptocurrency market in recent months, which may be in part due to perceived institutional backing and/or potentially advantageous features not incorporated into bitcoin. There are other cryptocurrencies gaining momentum as the price of the bitcoin continues to rise and investors see the cheaper cryptocurrencies as attractive alternatives. The continued rise of these alt-coins can lead to a reduction in demand for bitcoin, which could have an adverse effect on the price of bitcoin and may have an adverse impact on the performance of Bitcoin Instruments and the performance of the Funds.
The Funds may invest directly or indirectly in residual interests in real estate mortgage conduits (“REMICs”) (including by investing in residual interests in collateralized mortgage obligations (“CMOs”) with respect to which an election to be treated as a REMIC is in effect) or taxable mortgage pools (“TMPs”). Under a Notice issued by the IRS in October 2006 and Treasury regulations that have yet to be issued but may apply retroactively, a portion of a Fund’s income (including income allocated to the Fund from a REIT or other pass-through entity) that is attributable to a residual interest in a REMIC or an equity interest in a TMP (referred to in the Code as an “excess inclusion”) will be subject to federal income tax in all events. This Notice also provides, and the regulations are expected to provide, that excess inclusion income of a RIC will be allocated to shareholders of the RIC in proportion to the dividends received by such shareholders, with the same consequences as if the shareholders held the related interest directly. As a result, Funds investing in such interests may not be a suitable investment for charitable remainder trusts (see Unrelated Business Taxable Income, below).

A key attribute of a futures market is how its contract’s prices vary by expiration date. The succession of futures prices over time is called the “term structure”. If supply is stable (no seasonality or shortages) then typically futures prices will increase with expirations further in the future. This term structure configuration is called “contango” and it accounts for the fact that carry costs (e.g., time value of money) and profit expectations increase with time. Unless there are big changes in interest rates or the way that Bitcoin exchanges work I expect the level of contango in the Bitcoin futures term structure to be small. Bitcoins don’t cost much to hodl (once you have your hardware wallet) and there’s no apparent seasonality. The chart below from VIX Central shows a typical Bitcoin term structure (click on chart to get current data):

Each Fund may borrow money for cash management purposes or investment purposes. Borrowing for investment is a form of leverage. Leveraging investments, by purchasing securities with borrowed money, is a speculative technique which increases investment risk, but also increases investment opportunity. Because substantially all of a Fund’s assets will fluctuate in value, whereas the interest obligations on borrowings may be fixed, the NAV per share of the Fund will fluctuate more when the Fund is leveraging its investments than would otherwise be the case. Moreover, interest costs on borrowings may fluctuate with changing market rates of interest and may partially offset or exceed the returns on the borrowed funds. Under adverse conditions, a Fund might have to sell portfolio securities to meet interest or principal payments at a time when investment considerations would not favor such sales. Consistent with the requirements of the 1940 Act, each Fund must maintain continuous asset coverage (total assets, including assets acquired with borrowed funds, less liabilities exclusive of borrowings) of 300% of all amounts borrowed. If at any time the value of a Fund’s assets should fail to meet this 300% coverage test, the Fund, within three days (not including weekends and holidays), will

The ProShares Bitcoin/Blockchain Strategy ETF contains portfolio investments that are primarily listed on foreign markets. To the extent the Fund’s portfolio investments trade in foreign markets on days when the Fund is not open for business or when the primary exchange for its shares is not open, the value of the Fund’s assets may vary on days when shareholders may not be able to purchase or sell Fund shares and Authorized Participants may not be able to create or redeem Creation Units. Also, certain portfolio investments may not be traded on days the Fund is open for business.
With the increased use of technologies such as the Internet and the dependence on computer systems to perform necessary business functions, each Fund is susceptible to operational and information security risks. In general, cyber incidents can result from deliberate attacks or unintentional events. Cyber attacks include, but are not limited to gaining unauthorized access to digital systems for purposes of misappropriating assets or sensitive information, corrupting data, or causing operational disruption. Cyber attacks may also be carried out in a manner that does not require gaining unauthorized access, such as causing denial-of-service attacks on websites. Cyber security failures or breaches of a Fund’s third -party service provider (including, but not limited to, index providers, the administrator and transfer agent) or the issuers of securities in which the Funds invest, have the ability to cause disruptions and impact business operations, potentially resulting in financial losses, the inability of Fund shareholders to transact business, violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, reimbursement or other compensation costs, and/or additional compliance costs. In addition, substantial costs may be incurred in order to prevent any cyber incidents in the future. The Funds and their shareholders could be negatively impacted as a result. While the Funds have established business continuity plans and systems to prevent such cyber attacks, there are inherent limitations in such plans and systems including the possibility that certain risks have not been identified. Furthermore, the Funds cannot control the cyber security plans and systems put in place by issuers in which the Funds invest.
  •   An interruption in Internet service or a limitation of Internet access could have a negative impact on bitcoin. The Bitcoin Network relies on users access to the Internet. A significant disruption of Internet connectivity could impede the functionality of the Bitcoin Network and adversely affect the price of bitcoin. Any technical disruptions or regulatory limitations that affect Internet access may have an adverse effect on the Bitcoin Network, the price of bitcoin and the bitcoin futures contracts in which the Fund invests. In addition to technical disruptions such as cyber-attacks, the potential elimination of the net neutrality regulations in the U.S. may have a negative impact on bitcoin and the Bitcoin ecosystem.
If you are doing any active trading, set stop losses. For any coins not in your medium or long-term holds, always set stop losses. This is important for several reasons — the most obvious is mitigating your losses. But more importantly, you force yourself to decide on a point of acceptable loss, and because you now have a reference point, you are able to measure your effectiveness to keep or adjust for future trades. Sometimes, during a market dip, altcoins can plummet, and stop losses can lead to profitability by automatically selling for fiat that you can use to re-enter at lower prices.
That's why liquidity and volume are essential to a quality exchange. If you enter that contract at $400 and you see bitcoin spot price jumping to $500 but nobody is trading futures so you can't sell it to them, you get screwed. Luckily at this point in 2016 there are numerous options for trading futures that are liquid and settle on short time horizons. So you can typically trade contracts and get in and out of them with decent spreads and reasonable fees.
Created by Charlie Lee, a former Google engineer, Litecoin is an open-source payment network that operates on a global scale. It is not controlled by any centralized power, and it uses the “scrypt” as proof-of-work. It is similar to Bitcoin but has the advantage of offering a faster rate of generation and therefore faster transactions. This is one of the main reasons why its enthusiasts continue to invest or hold onto the coin even after finding out that its founder sold his stack.
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Decentralized cryptocurrency is produced by the entire cryptocurrency system collectively, at a rate which is defined when the system is created and which is publicly known. In centralized banking and economic systems such as the Federal Reserve System, corporate boards or governments control the supply of currency by printing units of fiat money or demanding additions to digital banking ledgers. In case of decentralized cryptocurrency, companies or governments cannot produce new units, and have not so far provided backing for other firms, banks or corporate entities which hold asset value measured in it. The underlying technical system upon which decentralized cryptocurrencies are based was created by the group or individual known as Satoshi Nakamoto.[28]
The Fund will issue and redeem shares only to Authorized Participants (typically, broker-dealers) in exchange for the deposit or delivery of a basket of assets (securities and/or cash) in large blocks, known as Creation Units, each of which is comprised of [                ] shares. Retail investors may only purchase and sell Fund shares on a national securities exchange through a broker-dealer. Because the Fund’s shares trade at market prices rather than NAV, shares may trade at a price greater than NAV (a premium) or less than NAV (a discount).
Market conditions should be considered favorable to a Fund when such conditions make it more likely that the value of an investment in that Fund will increase. Market conditions should be considered adverse to a Fund when such conditions make it more likely that the value of an investment in that Fund will decrease. For example, market conditions that cause the level of the S&P 500® to rise are considered “favorable” to the Ultra S&P500® and are considered “adverse” to the Short S&P500®.
Currently, Bitcoin futures have very high margin requirements. The Cboe requires 40% of the notional amount for maintenance margin, the CME requires 43%. Your broker will likely require more than that. The culprit behind these high requirements is Bitcoin’s high volatility—until that calms down the exchanges will protect themselves by requiring a bunch of up-front money. If you don’t come up with the money for a margin call they want to close out your position without leaving a negative balance.

In pure financial theory, the value of a futures contract is based on a "no arbitrage condition" from the interest rates in each asset. We have Bitcoin and US Dollar. Bitcoin interest rates tend to be less than US Dollar interest rates, so when you want to replicate the future value of bitcoin in US dollars, you have to borrow USD at, say, 5%, and invest in Bitcoin at 1% return. This requires a premium on the futures exchange to be able to hedge that trade. 
Crypto Facilities and the CME Group  have been calculating and publishing the Bitcoin Reference Rate (BRR) since November 2016. Such an official rate is a prerequisite of options trading in the traditional markets. The BRR is calculated based on the rates from the biggest exchanges: Bitstamp, GDAX, itBit, and Kraken. More concretely, it is calculated based on all Bitcoin vs. USD trades on the participating exchanges between 3 and 4 p.m. London time. To calculate the BRR, the hour between 3 and 4 is divided into 12 intervals of 5 minutes. For each interval, the volume-weighted median of the Bitcoin price is calculated (statistically, the median, in contrast to the average, prevents single outliers from distorting the price). The BRR is then the average of these 12 median values. More details about the calculation of the BRR can be found in the BRR whitepaper.