The Funds may invest in foreign issuers, securities traded principally in securities markets outside the United States, U.S.-traded securities of foreign issuers and/or securities denominated in foreign currencies (together “foreign securities”). Also, each Fund may seek exposure to foreign securities by investing in Depositary Receipts (discussed below). Foreign securities may involve special risks due to foreign economic, political and legal developments, including unfavorable changes in currency exchange rates, exchange control regulation (including currency blockage), expropriation or nationalization of assets, confiscatory taxation, taxation of income earned in foreign nations, withholding of portions of interest and dividends in certain countries and the possible difficulty of obtaining and enforcing judgments against foreign entities. Default in foreign government securities, political or social instability or diplomatic developments could affect investments in securities of issuers in foreign nations. In addition, in many countries there is less publicly available information about issuers than is available in reports about issuers in the United States. Foreign companies are not generally subject to uniform accounting, auditing and financial reporting standards, and auditing practices and requirements may differ from those applicable to U.S. companies. Further, the growing interconnectivity of global economies and financial markets has increased the possibilities that conditions in any one country or region could have an adverse impact on issuers of securities in a different country or region.

Do you remember, like, two weeks ago, when people were talking about how the launch of bitcoin futures at Cboe Global Markets Inc. and CME Group Inc. would allow for efficient short-selling of bitcoin and finally deflate the bubble? Smart hedge-fund money was lining up to bet against bitcoin, the thinking went, but had no convenient way to do it on the actual bitcoin exchanges. The only people trading bitcoin were the true believers, so of course it kept going up, but once it was opened up to normal financial players that would end. "The futures reduce the frictions of going short more than they do of going long, so it’s probably net bearish," said Craig Pirrong. 
ProShare Advisors, from its own resources, including profits from advisory fees received from the Funds, also may make payments to broker-dealers and other financial institutions for their services and expenses incurred in connection with the distribution and promotion of the Funds’ Shares. In this regard, the Advisor or an affiliate of the Advisor, may directly or indirectly make cash payments to certain broker-dealers for participating in activities that are designed to make registered representatives and other professionals more knowledgeable about exchange traded products, including the Funds, or for other activities, such as participation in marketing activities and presentations, educational training programs, conferences, the development of technology platforms and
  •   Lack of regulation. Digital commodities and their associated platforms are largely unregulated, and the regulatory environment is rapidly evolving. As a result, blockchain companies may be exposed to adverse regulatory action, fraudulent activity or even failure. Blockchain companies may face political or legal challenges from competitors, industry groups or local and national governments. New regulations may have a negative impact on blockchain technology and blockchain technology companies.
Commodity Swaps. Commodity swaps are used either as substitutes for owning a specific physical commodities or as a means of obtaining non-leveraged exposure in markets where a specific commodity is not available. Commodity swaps provide the Fund with the additional flexibility of gaining exposure to commodities by using the most cost-effective vehicle available.
In addition, the Advisor, any of its affiliates or employees and the Funds have a policy not to enter into any agreement or other understanding—whether written or oral—under which brokerage transactions or remuneration are directed to a broker to pay for distribution of a Fund’s shares. The table below sets forth the brokerage commissions paid by each Fund for the period noted for each Fund. Because each of the New Funds was not operational at the end of the Trust’s last fiscal year, information on brokerage commissions paid by the Fund is not included in this SAI.

The Bitcoin Network’s functionality relies on the Internet. A broadly accepted and widely adopted decentralized network is necessary for a fully-functional blockchain network, such as the Bitcoin Network. Features of the Bitcoin Network, such as decentralization, open source protocol, and reliance on peer-to-peer connectivity, are essential to preserve the stability of the network and decrease the risk of fraud or cyber-attacks. A significant disruption of Internet connectivity affecting large numbers of users or geographic areas could impede the functionality of the Bitcoin Network and adversely affect a Fund. 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 miners, Bitcoin Markets and the Bitcoin ecosystem. 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 Instruments in which the Funds invest.

ADRs represent the right to receive securities of foreign issuers deposited in a domestic bank or a correspondent bank. ADRs are an alternative to purchasing the underlying securities in their national markets and currencies. For many foreign securities, U.S. dollar-denominated ADRs, which are traded in the United States on exchanges or over-the-counter (“OTC”), are issued by domestic banks. In general, there is a large, liquid market in the United States for many ADRs. Investments in ADRs have certain advantages over direct investment in the underlying foreign securities because: (i) ADRs are U.S. dollar-denominated investments that are easily transferable and for which market quotations are readily available, and (ii) issuers whose securities are represented by ADRs are generally subject to auditing, accounting and financial reporting standards similar to those applied to domestic issuers. ADRs do not eliminate all risk inherent in investing in the securities of foreign issuers. By investing in ADRs rather than directly in the stock of foreign issuers outside the U.S., however, the Funds may avoid certain risks related to investing in foreign securities on non-U.S. markets.

On 25 March 2014, the United States Internal Revenue Service (IRS) ruled that bitcoin will be treated as property for tax purposes. This means bitcoin will be subject to capital gains tax.[80] In a paper published by researchers from Oxford and Warwick, it was shown that bitcoin has some characteristics more like the precious metals market than traditional currencies, hence in agreement with the IRS decision even if based on different reasons.[81]
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.