In a futures market, if the price is $500/BTC, an investor needs to buy 50 futures contracts, each worth $10. If an investor wishes to open a positive position then he goes long with “buy" contracts, and if he decides to open a negative position, he goes short with “sell” contracts. An investor’s position can be either positive or negative for the same instrument. (For more, see: Bitcoin Mass Hysteria: The Disaster that Brought Down Mt. Gox.)

A bitcoin exchange operates somewhat similarly to online stock trading brokers, where customers deposit their fiat currency (or bitcoins) to carry out trades. However, not all bitcoin exchanges offer such services. Some exchanges are more like wallets and thus provide limited trading options or storage of currency (both digital and fiat) for trading. The bigger and more elaborate exchanges offer trades between different cryptocurrencies, as well as between digital and fiat currencies. The number of currencies supported by an exchange varies from one exchange to another. (For more, see: Why Is Bitcoin’s Value So Volatile.)
Because of the wide range of types and maturities of corporate debt securities, as well as the range of creditworthiness of its issuers, corporate debt securities have widely varying potentials for return and risk profiles. For example, commercial paper issued by a large established domestic corporation that is rated investment-grade may have a modest return on principal, but carries relatively limited risk. On the other hand, a long-term corporate note issued by a small foreign corporation from an emerging market country that has not been rated may have the potential for relatively large returns on principal, but carries a relatively high degree of risk.

•   In order to qualify for the special tax treatment accorded a regulated investment company (“RIC”) and its shareholders, a Fund must derive at least 90% of its gross income for each taxable year from “qualifying income,” meet certain asset diversification tests at the end of each taxable quarter, and meet annual distribution requirements. A Fund’s pursuit of its investment strategies will potentially be limited by the Fund’s intention to qualify for such treatment and could adversely affect the Fund’s ability to so qualify. A Fund can make certain investments, the treatment of which for these purposes is unclear. If, in any year, a Fund were to fail to qualify for the special tax treatment accorded a RIC and its shareholders, and were ineligible to or were not to cure such failure, the Fund would be taxed in the same manner as an ordinary corporation subject to U.S. federal income tax on all its income at the fund level. The resulting taxes could substantially reduce the Fund’s net assets and the amount of income available for distribution. In addition, in order to requalify for taxation as a RIC, the Fund could be required to recognize unrealized gains, pay substantial taxes and interest, and make certain distributions. Please see the Statement of Additional Information for more information.
Trustees, is of an adequate size to oversee the operations of the Trust, and that, in light of the small size of the Board, a complex Board leadership structure is not necessary or desirable. The relatively small size of the Board facilitates ready communication among the Board members, and between the Board and management, both at Board meetings and between meetings, further leading to the determination that a complex board structure is unnecessary. In view of the small size of the Board, the Board has concluded that designating one of the three Independent Trustees as the “lead Independent Trustee” would not be likely to meaningfully enhance the effectiveness of the Board. The Board reviews its leadership structure periodically and believes that its structure is appropriate to enable the Board to exercise its oversight of the Funds.

  •   A new competing digital asset may pose a challenge to bitcoin’s current market dominance, resulting in a reduction in demand for bitcoin, which could have a negative impact on the price of bitcoin. It is possible that other digital currencies and trading systems could become more widely accepted and used than Bitcoin. The rise of such currencies could lead to a reduction in demand for bitcoin, which could have a negative impact on the price of bitcoin.
In certain circumstances, the securities delivery cycles currently practicable for transferring portfolio securities to redeeming investors, coupled with foreign market holiday schedules, will require a delivery process longer than seven calendar days. The holidays applicable to various countries during such periods are listed below, as are instances where more than seven days will be needed to deliver redemption proceeds. Although certain holidays may occur on different dates in subsequent years, the number of days required to deliver redemption proceeds in any given year is not expected to exceed the maximum number of days listed below for each Fund. The proclamation of new holidays, the treatment by market participants of certain days as “informal holidays” (e.g., days on which no or limited securities transactions occur, as a result of substantially shortened trading hours), the elimination of existing holidays, or changes in local securities delivery practices, could affect the information set forth herein.
There is no registry showing which individuals or entities own bitcoin or the quantity of bitcoin that is owned by any particular person or entity. It is possible, and in fact, reasonably likely, that a small group of early bitcoin adopters hold a significant proportion of the bitcoin that has been thus far created. There are no regulations in place that would prevent a large holder of bitcoin from selling their bitcoin, which could depress the price of bitcoin and have an adverse effect on an investment in the Funds which do not take a short position in bitcoin futures contracts.
If anything, the problem seems to start with incredibly lax risk management at this exchange.  According to the OKEX statement, the risk management team 'immediately' contacted the client to reduce the size of the trade - begging the question - how did their risk management system allow the trade to occur in the first place?  On the bright side, something like that should be easy to fix, but it is indicative, potentially of how many simple things are being overlooked in the rush to make money from crypto trading.
Transaction fees payable to the Trust are imposed to compensate the Trust for the transfer and other transaction costs of a Fund associated with the issuance and redemption of Creation Units of Shares. A fixed Transaction Fee is applicable to each creation or redemption transaction, regardless of the number of Creation Units purchased or redeemed. In addition, a variable Transaction Fee equal to a percentage of the value of each Creation Unit purchased or redeemed may be applicable to a creation or redemption transaction. Purchasers of Creation Units of the Matching and Ultra ProShares Funds for cash may also be required to pay an additional charge to compensate the relevant Fund for brokerage, market impact or other expenses. Where the Trust permits an in-kind purchaser to substitute cash in lieu of depositing a portion of the Deposit Securities, the purchaser will be assessed an additional charge for cash purchases. The maximum Transaction Fee on purchases and redemptions will be 2.00% of the NAV of any Creation Unit, except that for the High Yield—Interest Rate Hedged, the Investment Grade—Interest Rate Hedged and the Short Term USD Emerging Markets Bond ETF, a Transaction Fee up to 3.00% will be charged on the cash used in lieu of depositing all or a portion of the Deposit Securities or the cash portion of any redemption transaction. The Transaction Fees charged to each Fund are presented in the Authorized Participant Handbook.
Blockchain technology builds on the innovations of the blockchain and adopts it for many business, recreational and personal applications. Although initially associated with digital commodities like bitcoin and other cryptocurrencies, blockchain technology can be used to track tangible, intangible and digital assets and companies in all business sectors. Blockchain technology may, in the future, be used to support a wide array of business applications in many different industries and markets. It is an emerging technology that has the potential to redefine how records of value are transacted. Blockchain technology seeks to facilitate the process of recording transactions and tracking assets (e.g., cryptocurrency, contracts, information, etc.) through solving challenges of counterparty trust and alleviating the need for a central repository or ledger. It is designed to provide a transparent and secure process to transfer and digitally record information or property on a shared transaction database through a secure, decentralized, peer-to-peer distributed ledger.
R-1 (middle) – Short term debt rated “R-1 (middle)” is of superior credit quality and, in most cases, ratings in this category differ from “R-1 (high)” credits to only a small degree. Given the extremely tough definition which DBRS has for the “R-1 (high)” category (which few companies are able to achieve), entities rated “R-1 (middle)” are also considered strong credits which typically exemplify above average strength in key areas of consideration for debt protection.

As discussed above in “Investment in a Subsidiary”, each of the Managed Futures Strategy ETF, the Crude Oil Strategy ETF the Bitcoin Futures Strategy ETF, the Short Bitcoin Futures Strategy ETF, the Blockchain/Bitcoin Strategy ETF, and the Bitcoin Futures/Equity Strategy ETF (each, a “Parent Fund”) intends to achieve commodity exposure through investment in a wholly-owned foreign subsidiary (each a “Subsidiary”). Each Subsidiary is classified as a corporation and is treated as a “controlled foreign corporation” (“CFC”) for U.S. federal income tax purposes. Each Parent Fund will limit its investments in its Subsidiary in the aggregate to 25% of the Parent Fund’s total assets. Each Parent Fund does not expect that income from its investment in its Subsidiary will be eligible to be treated as qualified dividend income or that distributions from its Subsidiary will be eligible for the corporate dividends-received deduction.

The biggest problem of the Blockchain is its reliance on miners. This is exactly why the cryptocurrency called IOTA (the Internet of Thigs Application) was created in 2016. IOTA also battles increasing transaction fees and network scalability. IOTA’s blockchain is called Tangle. It is a blockchain with no blocks and no chains. In this system, the users themselves are responsible for validating transactions. This means there’s no need for approval from miners; so users enjoy a fee-free transaction and an increased process speed.
In September 2015, the establishment of the peer-reviewed academic journal Ledger (ISSN 2379-5980) was announced. It covers studies of cryptocurrencies and related technologies, and is published by the University of Pittsburgh.[114][115] The journal encourages authors to digitally sign a file hash of submitted papers, which will then be timestamped into the bitcoin blockchain. Authors are also asked to include a personal bitcoin address in the first page of their papers.[116][117]

The existence of market makers (e.g., Virtu Financial) refutes a common assertion about futures—that there‘s always a loser for every winner, that it’s a zero-sum game. It’s true that derivatives like stock options and futures are created in matched pairs—a long and a short contract. If two speculators own those two contracts the profits on one side are offset by losses on the other but market makers are not speculators. In general, they’re not betting on the direction of the market. They act as intermediaries, selling to buyers at the higher ask price and buying from sellers at the lower bid price— collecting the difference.
  •   A decline in the adoption of bitcoin could have a negative effect on the price of bitcoin and bitcoin-related investments. Bitcoin’s adoption has been on a generally continuous climb since bitcoin first gained mass media attention in 2013. However, there can be no guarantees this growth will continue. Further, adoption of bitcoin as a means of payment has been limited when compared with the increase in the price of bitcoin, indicating that the majority of bitcoin’s use is for investment and speculative purposes. A lack of acceptance of bitcoin as a means of payment could negatively impact the price of the bitcoin futures contracts in which the Fund invests.
The Administrator pays all fees and expenses that are directly related to the services provided by the Administrator to the Funds; each Fund reimburses the Administrator for all fees and expenses incurred by the Administrator which are not directly related to the services the Administrator provides to the Funds under the service agreement. Each Fund may also reimburse the Administrator for such out-of-pocket expenses as incurred by the Administrator in the performance of its duties. For these services each Fund that was operational for the period indicated paid the Administrator and Citi the amounts set forth below. Because the New Fund was not operational at the end of the Trust’s last fiscal year, information on fees paid to the Administrator and Citi on behalf of the New Fund is not included in this SAI.
Interestingly, the cryptocurrency market seems to rise and fall simultaneously with the altcoins. Is a systemic issue that causes this harmonious rise and fall of prices on the exchanges? The answer is a little fuzzy, but there are several factors at play. Most exchanges use Bitcoin as the universal trading currency, which leads to many investors buying and selling Bitcoin to buy and sell altcoins. When bitcoin starts a bull run, many of the altcoins fall, as investors jump on the Bitcoin train and vice versa. It’s also systemic because most exchanges require Bitcoin rather than fiat currency to transact. It is easy to invest fiat currency in the market and then leave there as an investor trades it; moving it from one currency to another and not cashing it back to fiat currency. Furthermore, When the Bitcoin price falls or rises against the fiat currency, all the altcoins will usually follow. This is because all altcoin prices are based on their Bitcoin exchange rate, not their fiat currency exchange rate. The value of an altcoin in fiat currency is the value of the altcoin in Bitcoin and then Bitcoin’s value in that fiat currency. It is Bitcoin that strongly affects pricing.
The Advisor and its affiliated persons may come into possession from time to time of material nonpublic and other confidential information about companies which, if disclosed, might affect an investor’s decision to buy, sell, or hold a security. Under applicable law, the Advisor and its affiliated persons would be prohibited from improperly disclosing or using this information for their personal benefit or for the benefit of any person, regardless of whether the person is a client of the Advisor. Accordingly, should the Advisor or any affiliated person come into possession of material nonpublic or other confidential information with respect to any company, the Advisor and its affiliated persons will have no responsibility or liability for failing to disclose the information to clients as a result of following its policies and procedures designed to comply with applicable law. However, each Matching Fund is managed using what is commonly referred to as an index strategy in an attempt to simulate either the daily movement or a multiple, the inverse or an inverse multiple of the daily movement of its index, and the use of such index strategies may reduce conflicts of interest compared to funds using non-index investment strategies.

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.
  •   Intellectual property rights claims may adversely affect the operation of the Bitcoin Network. Third parties may assert intellectual property rights claims relating to the operation of the Bitcoin Network. Regardless of the merit of any intellectual property or other legal action, any threatened action that reduces confidence in the Bitcoin Network’s long-term viability or the ability of end-users to hold and transfer bitcoin may adversely affect the price of bitcoin and adversely affect the price of the bitcoin futures contracts held by the Fund.
Currently the front month future is the January contract which at last check could be sold for $17,600.  This contract settles in a cash transfer based on the 4:00 pm eastern bitcoin auction price on Wednesday January 17, 2018 established by Gemini who is partnering with Cboe Global Markets.  The bitcoin price at Gemini is close to $16,600 so I will use that for the underlying bitcoin price in this example. 
A tax-exempt shareholder may also recognize UBTI if a Fund recognizes “excess inclusion income” (as described above) derived from direct or indirect investments in residual interests in REMICs or equity interests in TMPs if the amount of such income recognized by the Fund exceeds the Fund’s investment company taxable income (after taking into account deductions for dividends paid by the Fund). In addition, special tax consequences apply to charitable remainder trusts (“CRTs”) that invest in RICs that invest directly or indirectly in residual interests in REMICs or equity interests in TMPs. Under legislation enacted in December 2006, a CRT (as defined in section 664 of the Code) that realizes any UBTI for a taxable year must pay an excise tax annually of an amount equal to such UBTI. Under IRS guidance issued in October 2006, a CRT will not recognize UBTI as a result of investing in a Fund that recognizes “excess inclusion income.” Rather, if at any time during any taxable year a CRT (or one of certain other tax-exempt shareholders, such as the United States, a state or political subdivision, or an agency or instrumentality thereof, and certain energy
All Shares of the Trust are freely transferable. The Shares do not have preemptive rights or cumulative voting rights, and none of the Shares have any preference to conversion, exchange, dividends, retirements, liquidation, redemption or any other feature. Shares have equal voting rights, except that, in a matter affecting a particular series or class of Shares, only Shares of that series or class may be entitled to vote on the matter. Trust shareholders are entitled to require the Trust to redeem Creation Units of their Shares. The Declaration of Trust confers upon the Board of Trustees the power, by resolution, to alter the number of Shares constituting a Creation Unit or to specify that Shares may be individually redeemable. The Trust reserves the right to adjust the stock prices of Shares to maintain convenient trading ranges for investors. Any such adjustments would be accomplished through stock splits or reverse stock splits which would have no effect on the net assets of the applicable Fund.

Now, what if the Bitcoin price is rising? For example, if 1 BTC is worth 5,500 USD, you don’t want to fulfill this contract any more and sell cheap for 5,000 USD. In order to still make things fair for both participants, the exchange (here CME) will make sure that you can sell for the current market price of 5,500 USD if you so wish, but they will compensate your contract partner for this. How? They will take the difference – 500 USD – out of your so-called margin account and give it to Mortimer. This kind of settlement is not only performed on the fulfilment date of the futures contract, but on every trading day, according to the current price of the asset.