As of May 2018, over 1,800 cryptocurrency specifications existed.[29] Within a cryptocurrency system, the safety, integrity and balance of ledgers is maintained by a community of mutually distrustful parties referred to as miners: who use their computers to help validate and timestamp transactions, adding them to the ledger in accordance with a particular timestamping scheme.[16]


the option to purchase the asset underlying the option at the exercise price if the option is exercised. During the term of the option, the writer may be assigned an exercise notice by the broker-dealer through whom the option was sold. The exercise notice would require the writer to deliver, in the case of a call, or take delivery of, in the case of a put, the underlying asset against payment of the exercise price. This obligation terminates upon expiration of the option, or at such earlier time that the writer effects a closing purchase transaction by purchasing an option covering the same underlying asset and having the same exercise price and expiration date as the one previously sold. Once an option has been exercised, the writer may not execute a closing purchase transaction. To secure the obligation to deliver the underlying asset in the case of a call option, the writer of a call option is required to deposit in escrow the underlying asset or other assets in accordance with the rules of the Options Clearing Corporation (the “OCC”), an institution created to interpose itself between buyers and sellers of options. The OCC assumes the other side of every purchase and sale transaction on an exchange and, by doing so, gives its guarantee to the transaction. When writing call options on an asset, a Fund may cover its position by owning the underlying asset on which the option is written. Alternatively, the Fund may cover its position by owning a call option on the underlying asset, on a share-for-share basis, which is deliverable under the option contract at a price no higher than the exercise price of the call option written by the Fund or, if higher, by owning such call option and depositing and segregating cash or liquid instruments equal in value to the difference between the two exercise prices. In addition, a Fund may cover its position by segregating cash or liquid instruments equal in value to the exercise price of the call option written by the Fund. When a Fund writes a put option, the Fund will segregate with its custodian bank cash or liquid instruments having a value equal to the exercise value of the option. The principal reason for a Fund to write call options on assets held by the Fund is to attempt to realize, through the receipt of premiums, a greater return than would be realized on the underlying assets alone.
Shares will be continuously offered for sale by the Trust through the Distributor only in Creation Units, as described below under “Purchase and Issuance of Creation Units.” Shares in less than Creation Units are not distributed by the Distributor. The Distributor also acts as agent for the Trust. The Distributor will deliver a Prospectus to persons purchasing Shares in Creation Units and will maintain records of both orders placed with it and confirmations of acceptance furnished by it. The Distributor is a broker-dealer registered under the 1934 Act and a member of the Financial Industry Regulatory Authority, Inc. The Distributor has no role in determining the investment policies of the Funds or which securities are to be purchased or sold by the Funds.
Additions such as Zerocoin have been suggested, which would allow for true anonymity.[54][55][56] In recent years, anonymizing technologies like zero-knowledge proofs and ring signatures have been employed in the cryptocurrencies Zcash and Monero, respectively. Cryptocurrency anonymizing implementations such as Cloakcoin, Dash, and PIVX use built in mixing services, also known as tumblers.[57]

The use of swaps is a highly specialized activity which involves investment techniques and risks in addition to, and in some cases different from, those associated with ordinary portfolio securities transactions. The primary risks associated with the use of swap agreements are mispricing or improper valuation, imperfect correlation between movements in the notional amount and the price of the underlying investments, and the inability of the counterparties or clearing organization to perform. If a counterparty’s creditworthiness for an over-the-counter swap declines, the value of the swap would likely decline. Moreover, there is no guarantee that a Fund could eliminate its exposure under an outstanding swap agreement by entering into an offsetting swap agreement with the same or another party. In addition, a Fund may use a combination of swaps on an underlying index and swaps on an ETF that is designed to track the performance of that index. The performance of an ETF may not track the performance of its underlying index due to embedded costs
The Funds may be eligible to elect alternative tax treatment with respect to PFIC shares. Under an election that currently is available in some circumstances, a Fund generally would be required to include in its gross income its share of the earnings of a PFIC on a current basis, regardless of whether distributions were received from the PFIC in a given year. If this election were made, the special rules, discussed above, relating to the taxation of excess distributions, would not apply. Another election would involve marking to market a Fund’s PFIC shares at the end of each taxable year, with the result that unrealized gains would be treated and reported as though they were realized as ordinary income on the last day of the taxable year. Any mark-to-market losses and any loss from an actual disposition of PFIC shares would be deductible by the Fund as ordinary losses to the extent of any net mark-to-market gains included in income in prior years. Making either of these two elections may require a Fund to liquidate other investments (including when it is not advantageous to do so) to meet its distribution requirements, which also may accelerate the recognition of gain and affect the Fund’s total return. Dividends paid by PFICs will not be eligible to be treated as “qualified dividend income.” Because it is not always possible to identify a foreign corporation as a PFIC, the Fund may incur the tax and interest charges described above in some instances.
In the course of managing the Fund’s investments, ProShare Advisors will need to periodically adjust the Fund’s holdings in order to maintain investment exposure approximately equivalent to the Fund’s assets. This process entails obtaining additional inverse exposure as the Fund experiences gains, and reducing inverse exposure as the Fund experiences losses. The higher the volatility of the bitcoin futures contracts in which the Fund invests, the more such rebalancing can adversely affect the Fund’s performance.
Cryptocurrency is based on knowledge sharing on a distributed platform. The entire transactional history is for everyone to see. One blockchain is one thread of transaction. One unit or one block stores many transactions. The size of the block is 1MB and generally stores around 1000 to 2000 transactions. The data entered cannot be altered, nor can it be removed, enabling a system of complete transparency and trust. The entire money flow for the working model is beyond the traditional practices of controlling tax rates, credit usage, and money supply in the market.
The price of bitcoin on individual bitcoin exchanges, as well as the broader Bitcoin Exchange Market generally, has experienced periods of extreme volatility. This volatility is due in part to low liquidity and the changes exhibited by an early stage technological innovation. Speculators and investors who seek to profit from trading and holding bitcoin currently account for a significant portion of bitcoin demand. Such speculation regarding the potential future appreciation in the value of bitcoin may artificially inflate the price of bitcoin causing a negative impact on the performance of certain Funds which take a short position in bitcoin futures contracts. Conversely, government regulation and the perception of onerous regulatory actions may cause a drop in the price of bitcoin causing a negative impact on the performance of certain Funds which take a long position in bitcoin futures contracts. Developments related to the Bitcoin Network’s operations, Bitcoin Exchanges and the overall Bitcoin Exchange Market also contribute to the volatility in the price of bitcoin. These factors may continue to increase the volatility of the price of bitcoin which may have a negative impact on the performance of the Bitcoin Instruments and on the performance of the Funds.

The Fund will periodically adjust its holdings in order to maintain inverse exposure to bitcoin futures contracts. As the price of bitcoin futures contracts declines, net assets of the Fund will generally increase resulting in inverse exposure that is less than the value of the Fund’s assets. Conversely, when the price of bitcoin futures contracts increases, net assets of the Fund will generally decrease resulting in inverse exposure that is more than the value of the Fund’s assets, and the Fund’s inverse exposure will be periodically adjusted to restore approximately equivalent inverse exposure.
Example: If the futures contract price is $400, then you can buy 0.5btc worth of this and if the price of bitcoin goes up to $450 the futures contract price will go up, and the value increases from 0.5 BTC and you can just sell for a profit. Trading a synthetic derivative rather than spot bitcoin allows you to use margin leverage to more easily buy and sell -- the contracts are just a facilitation of the value.
The Officers, under the supervision of the Board, manage the day-to-day operations of the Trust. One Trustee and all of the Officers of the Trust are directors, officers or employees of ProShare Advisors or Foreside Management Services, LLC. The other Trustees are Independent Trustees. The Trustees and some Officers are also directors and officers of some or all of the other funds in the Fund Complex. The Fund Complex includes all funds advised by ProShare Advisors and any funds that have an investment adviser that is an affiliated person of ProShare Advisors.
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.
Each Fund may also enter into reverse repurchase agreements, which may be viewed as a form of borrowing, with financial institutions. However, under current pronouncements, to the extent a Fund “covers” its repurchase obligations, as described above in “Reverse Repurchase Agreements,” such agreement will not be considered to be a “senior security” and, therefore, will not be subject to the 300% asset coverage requirement otherwise applicable to borrowings by that Fund.
ProShare Advisors, located at 7501 Wisconsin Avenue, Suite 1000E, Bethesda, Maryland 20814, serves as the investment adviser to the fund and provides investment advice and management services to each Fund. ProShare Advisors oversees the investment and reinvestment of the assets in each Fund. Pursuant to the Investment Advisory and Management Agreement between ProShare Advisors and the Trust (entered into on behalf of each Fund), ProShare Advisors is responsible for substantially all expenses of the Fund, except interest expenses, taxes, brokerage and other transaction costs, compensation and expenses of the Independent Trustees, compensation and expenses of counsel to the Independent Trustees, compensation and expenses of the Trust’s chief compliance officer and his or her staff, future distribution fees or expenses, and extraordinary expenses. For its investment advisory and management services, ProShares Bitcoin Futures Strategy ETF pays ProShare Advisors a fee at an annualized rate of     % of average daily net assets of the Fund; ProShares Short Bitcoin Futures Strategy ETF pays ProShare Advisors a fee at an annualized rate of    % of average daily net assets of the Fund; ProShares Bitcoin Futures/Equity Strategy ETF pays ProShare Advisors a fee at an annualized rate of    % of average daily net assets of the Fund; and ProShares Bitcoin/Blockchain Strategy ETF pays ProShare Advisors a fee at an annualized rate of    % of average daily net assets of the Fund. A discussion regarding the basis for the Board approving the investment advisory and management agreement for each Fund will be included in the Trust’s semi-annual or annual report to shareholders that covers the period during which the approval occurred.

•   Investments by a Fund in options, futures, forward contracts, swap agreements and other derivative financial instruments are subject to numerous special and complex tax rules. These rules could affect the amount, timing or character of the distributions to shareholders by a Fund. In addition, because the application of these rules may be uncertain under current law, an adverse determination or future Internal Revenue Service guidance with respect to these rules may affect whether a Fund has made sufficient distributions, and otherwise satisfied the relevant requirements, to maintain its qualification as a regulated investment company and avoid fund-level tax.
Other forms of swap agreements that the Funds may enter into include: interest rate caps, under which, in return for a premium, one party agrees to make payments to the other to the extent that interest rates exceed a specified rate, or “cap”; interest rate floors, under which, in return for a premium, one party agrees to make payments to the other to the extent that interest rates fall below a specified level, or “floor”; and interest rate collars, under which a party sells a cap and purchases a floor or vice versa in an attempt to protect itself against interest rate movements exceeding given minimum or maximum levels.
Short Term USD Emerging Markets Bond ETF; Crude Oil Strategy ETF; Inflation Expectations ETF; CDS Short North American HY Credit ETF and Short or Ultra Fixed Income ProShares Funds    2:30 p.m. (3:00 p.m., if transmitted by mail; except 4:00 p.m., if transmitted by mail on behalf of Short High Yield or Ultra High Yield) in order to receive that day’s closing NAV per Share
Bitcoin futures contracts are a new type of futures contract that began trading in December 2017. Unlike the established futures markets for traditional physical commodities, the market for bitcoin futures contracts is in the developmental stage and has very limited volume, trading and operational history. Bitcoins and other cryptocurrencies are a new and developing asset class subject to both developmental and regulatory uncertainty. As such, bitcoin futures contracts and the market for bitcoin futures contracts may be riskier, less liquid, more volatile and more vulnerable to economic, market, industry, regulatory and other changes than more established futures contracts and futures markets. There is no assurance that a liquid market will emerge or be sustained for bitcoin futures contracts. The liquidity of the market for bitcoin futures contracts will depend on, among other things, the supply and demand for bitcoin futures contracts, the adoption of bitcoin and the commercial and speculative interest in the market for bitcoin futures contracts and the potential ability to hedge against the price of bitcoin with exchange-traded bitcoin futures contracts. Additionally, if market participants executing trades in bitcoin futures contracts face constraints, including capital constraints, security risks, or high execution costs, the price of bitcoin futures contracts may fail to capture price movements in the underlying price of bitcoin.

RUSSELL DOES NOT GUARANTEE THE ACCURACY AND/OR THE COMPLETENESS OF THE RUSSELL INDEX OR ANY DATA INCLUDED THEREIN AND RUSSELL SHALL HAVE NO LIABILITY FOR ANY ERRORS, OMISSIONS, OR INTERRUPTIONS THEREIN. RUSSELL MAKES NO WARRANTY, EXPRESS OR IMPLIED, AS TO RESULTS TO BE OBTAINED BY PROSHARES TRUST, INVESTORS, FUND SHAREHOLDERS, OR ANY OTHER PERSON OR ENTITY FROM THE USE OF THE RUSSELL INDEX OR ANY DATA INCLUDED THEREIN. RUSSELL MAKES NO EXPRESS OR IMPLIED WARRANTIES, AND EXPRESSLY DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE WITH RESPECT TO THE RUSSELL INDEX OR ANY DATA INCLUDED THEREIN. WITHOUT LIMITING ANY OF THE FOREGOING, IN NO EVENT SHALL RUSSELL HAVE ANY LIABILITY FOR ANY SPECIAL, PUNITIVE, INDIRECT, OR CONSEQUENTIAL DAMAGES (INCLUDING LOST PROFITS), EVEN IF NOTIFIED OF THE POSSIBILITY OF SUCH DAMAGES.
A Parent Fund’s investment in its Subsidiary will potentially have the effect of accelerating the Fund’s recognition of income and causing its income to be treated as ordinary income, regardless of the character of such subsidiary’s income. If a net loss is realized by a Subsidiary, such loss is generally not available to offset the income earned by a Parent Fund. In addition, the net losses incurred during a taxable year by a Subsidiary cannot be carried forward by such Subsidiary to offset gains realized by it in subsequent taxable years. The Parent Funds will not receive any credit in respect of any non-U.S. tax borne by a Subsidiary.
Cryptocurrency is also used in controversial settings in the form of online black markets, such as Silk Road. The original Silk Road was shut down in October 2013 and there have been two more versions in use since then. In the year following the initial shutdown of Silk Road, the number of prominent dark markets increased from four to twelve, while the amount of drug listings increased from 18,000 to 32,000.[84]
So far, these derivatives market have only been a niche occupied by crypto enthusiasts. That is until one of the newcomers, Crypto Facilities, and an incumbent in the derivatives market have joined forces: Crypto Facilities and the CME Group. The CME Group (controlling, for example, the Chicago Mercantile Exchange that has been around for more than a century) is a large-scale business that is officially regulated and audited by the US financial authorities. It settles its contracts in fiat money rather than cryptocurrency, thus enabling non-crypto experts to speculate on Bitcoin.
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