Standard & Poor’s® and S&P® are registered trademarks of Standard & Poor’s Financial Services LLC (“S&P”) and Dow Jones® is a registered trademark of Dow Jones Trademark Holdings LLC (“Dow Jones”). The Indexes are a product of S&P Dow Jones Indices LLC or its affiliates, and have been licensed for use by ProShares. The Funds are not sponsored, endorsed, sold or promoted by S&P Dow Jones Indices LLC, Dow Jones, S&P, any of their third party licensors, or any of their respective affiliates (collectively, “S&P Dow Jones Indices”). S&P Dow Jones Indices does not make any representation or warranty, express or implied, to the owners of the Funds or any member of the public regarding the advisability of investing in securities generally or in the Funds particularly or the ability of the Indexes to track general market performance. S&P Dow Jones Indices’ only relationship to ProShares with respect to the Indexes is the licensing of the Indexes and certain trademarks, service marks and/or trade names of S&P Dow Jones Indices. The Indexes are determined, composed and calculated by S&P Dow Jones Indices without regard to ProShares or the Funds. S&P Dow Jones Indices have no obligation to take the needs of ProShares or the owners of the Funds into consideration in determining, composing or calculating the Indexes. S&P Dow Jones Indices are not responsible for and have not participated in the determination of the prices, and amount of the Funds or the timing of the issuance or sale of the Funds or in the determination or calculation of the equation by which the Funds are to be converted into cash or redeemed, as the case may be. S&P Dow Jones Indices have no obligation or liability in connection with the administration, marketing or trading of the Funds. There is no assurance that investment products based on the Indexes will accurately track index performance or provide positive investment returns. S&P Dow Jones Indices LLC and its subsidiaries are not investment advisers. Inclusion of a security within an index is not a recommendation by S&P Dow Jones Indices to buy, sell, or hold such security, nor is it considered to be investment advice.
The only way that new Bitcoin can be created is through a process called “mining.” Bitcoin mining occurs when users process transactional data into “blocks” and then add them to the blockchain. As payment for this service, miners are awarded specific amounts of new Bitcoin. Upon its launch, the maximum supply of Bitcoin was predetermined to be 21 million.
Each Fund may purchase illiquid securities, including securities that are not readily marketable and securities that are not registered (“restricted securities”) under the Securities Act of 1933 (the “1933 Act”), but which can be sold to qualified institutional buyers under Rule 144A under the 1933 Act. A Fund will not invest more than 15% of the Fund’s net assets in illiquid securities. The term “illiquid securities” for this purpose means securities that cannot be disposed of within seven days in the ordinary course of business at approximately the amount at which the Fund has valued the securities. Under the current guidelines of the staff of the SEC, illiquid securities also are considered to include, among other securities, purchased OTC options, certain cover for OTC options, repurchase agreements with maturities in excess of seven days, and certain securities whose disposition is restricted under the federal securities laws. The Fund may not be able to sell illiquid securities when the Advisor considers it desirable to do so or may have to sell such securities at a price that is lower than the price that could be obtained if the securities were more liquid. In addition, the sale of illiquid securities also may require more time and may result in higher dealer discounts and other selling expenses than the sale of securities that are not illiquid. Illiquid securities may be more difficult to value due to the unavailability of reliable market quotations for such securities, and investments in illiquid securities may have an adverse impact on NAV.

CryptoFacilities, Coinpit, and BitMEX has a realtime profit realisation, while OKCoin and Deribit has weekly rebalancing scheduled for all contract lengths. It's important to note that on all of these exchanges, all the futures and forwards are non-deliverable and have expiration at various times. Despite this, OKCoin uses "delivery" as their term for expiration settlement of a contract, and "settlement" for the weekly rebalancing of the Pnl for higher length contracts. Since we are stuck with this unprofessional Chinese exchange being the dominant market player in futures, we have to focus on their use of the terminology, but BitMEX and CryptoFacilities have very impressive and professional setups that use well documented procedures. Always read the documentation of any exchange you're using and the contract specifications of the individual product you're using.
Because a Fund invests in cash instruments denominated in foreign currencies, it may hold foreign currencies pending investment or conversion into U.S. dollars. Although the Fund values its assets daily in U.S. dollars, it does not convert its holdings of foreign currencies into U.S. dollars on a daily basis. The Fund will convert its holdings from time to time, however, and incur the costs of currency conversion. Foreign exchange dealers may realize a profit based on the difference between the prices at which they buy and sell various currencies. Thus, a dealer may offer to sell a foreign currency to the Fund at one rate, and offer to buy the currency at a lower rate if the Fund tries to resell the currency to the dealer.
 	•	 	an officer of an investment company, or a person that would be an investment company but for the exclusions provided by sections 3(c)(1) and 3(c)(7) of the 1940 Act, having the same investment adviser or principal underwriter as the Trust or having an investment adviser or principal underwriter that directly or indirectly controls, is controlled by, or is under common control with the Advisor or principal underwriter of the Trust;

The Funds may invest in shares of foreign corporations that are classified under the Code as passive foreign investment companies (“PFICs”). In general, a foreign corporation is classified as a PFIC if at least one-half of its assets constitute investment-type assets, or 75% or more of its gross income is investment-type income. Certain distributions from a PFIC, as well as gain from the sale of PFIC shares, are treated as “excess distributions.” Excess distributions are taxable as ordinary income even though, absent
Distributions of Shares shall be made to DTC or its nominee, Cede & Co., as the registered holder of all Shares. DTC or its nominee, upon receipt of any such distributions, shall credit immediately DTC Participants’ accounts with payments in amounts proportionate to their respective beneficial interests in Shares as shown on the records of DTC or its nominee. Payments by DTC Participants to Indirect Participants and Beneficial owners of Shares held through such DTC Participants will be governed by standing instructions and customary practices, as is now the case with securities held for the accounts of customers in bearer form or registered in a “street name,” and will be the responsibility of such DTC Participants. The Trust has no responsibility or liability for any aspects of the records relating to or notices to Beneficial owners, or payments made on account of beneficial ownership interests in such Shares, or for maintaining, supervising or reviewing any records relating to such beneficial ownership interests or for any other aspect of the relationship between DTC and the DTC Participants or the relationship between such DTC Participants and the Indirect Participants and Beneficial owners owning through such DTC Participants.
Assume there is 0 contracts open and 2 traders, and a new futures contract expiring in 7 days opens. You can "create" a contract by putting a limit sell order in the orderbook at a given price. If someone market buys that limit order, an open contract is created between you and the other trader. This is how you can go from a position of 0 to a negative exposure just by selling a contract.
The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your Shares at the end of each period. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your approximate costs would be:
Wall Street Bonus Pools Look Shallow in Unexciting Trading Year. Banks to Funds: Have Some Leverage With That Deal. Companies drive borrowing binge to record $6.8tn in 2017. Broken bonds: The role Wall Street played in wiping out Puerto Ricans' savings. China keeps IPOs on tight leash to protect policy goals. John Griffin to Shut Blue Ridge Capital Hedge Fund After 21 Years. Jailed Barclays Trader Must Pay $400,000 From Libor Profits. Private equity selling assets at fastest pace since crisis. The rate of return on everything. Activist Investors’ Role Needs More Transparency, SEC Nominee Says. The Trump Administration’s Move Against SEC Judges. Best statistics of 2017 are 69 and 0.1.  The Would-Be Amazon of Sex Toys Became the Radio Shack Instead. Comedy Wildlife Photography Awards. "A married hedge-funder wooed his beauty-pageant mistress with the promise of an ostrich farm in Uganda — only to gift her with an STD, a Manhattan Supreme Court lawsuit says."
While cryptocurrencies are digital currencies that are managed through advanced encryption techniques, many governments have taken a cautious approach toward them, fearing their lack of central control and the effects they could have on financial security.[99] Regulators in several countries have warned against cryptocurrency and some have taken concrete regulatory measures to dissuade users.[100] Additionally, many banks do not offer services for cryptocurrencies and can refuse to offer services to virtual-currency companies.[101] Gareth Murphy, a senior central banking officer has stated "widespread use [of cryptocurrency] would also make it more difficult for statistical agencies to gather data on economic activity, which are used by governments to steer the economy". He cautioned that virtual currencies pose a new challenge to central banks' control over the important functions of monetary and exchange rate policy.[102] While traditional financial products have strong consumer protections in place, there is no intermediary with the power to limit consumer losses if bitcoins are lost or stolen.[103] One of the features cryptocurrency lacks in comparison to credit cards, for example, is consumer protection against fraud, such as chargebacks.
The Fund generally does not expect to invest directly in futures contracts, option contracts and swap agreements (“Bitcoin Instruments”). The Fund expects to gain exposure to these investments by investing a portion of its assets in the ProShares Cayman Short Bitcoin Futures Strategy Portfolio, a wholly-owned subsidiary of the Fund organized under the laws of the Cayman Islands (the “Subsidiary”). The Subsidiary is advised by ProShare Advisors, the Fund’s investment advisor, and invests directly in Bitcoin Instruments. Unlike the Fund, the Subsidiary is not an investment company registered under the 1940 Act. The Fund’s investment in the Subsidiary is intended to provide the Fund with exposure to commodity markets related to bitcoin in accordance with applicable rules and regulations. The Fund will invest up to 25% of its total assets in the Subsidiary. Except as otherwise noted, references to the Fund’s investment strategies and risks include the investment strategies and risks of the Subsidiary.
These are NOT linked to or related in any way, to the futures contracts that trade on the CME or CBOE.  Not every article I have read makes this clear.  So the bright side of this story is that the contracts listed and traded on U.S. exchanges were not involved.  That is encouraging from both a regulatory aspect and for the future potential growth of cryptocurrency linked products in the U.S.
Transactions in options, futures, forward contracts, swaps and certain positions undertaken by the Funds may result in “straddles” for federal income tax purposes. The straddle rules may affect the character of gains (or losses) realized by a Fund, and losses realized by the Fund on positions that are part of a straddle may be deferred under the straddle rules, rather than being taken into account in calculating taxable income for the taxable year in which the losses are realized. In addition, certain carrying charges (including interest expense) associated with positions in a straddle may be required to be capitalized rather than deducted currently. Certain elections that a Fund may make with respect to its straddle positions may also affect the amount, character and timing of the recognition of gains or losses from the affected positions.
Since you bought 68.4246 BTC, you want to short 68 BTC and lock in the USD value. You will have 0.4246 BTC left over, which will give you a slightly long bias. You can either fix this by only buying 68 BTC in step 1 or by giving yourself more short exposure by shorting 69 BTC. Remember that CryptoFacilities contracts are inverse (which allow locking in USD) and are denominated in BTC