Bitcoin is pseudonymous rather than anonymous in that the cryptocurrency within a wallet is not tied to people, but rather to one or more specific keys (or "addresses").[53] Thereby, bitcoin owners are not identifiable, but all transactions are publicly available in the blockchain.[53] Still, cryptocurrency exchanges are often required by law to collect the personal information of their users.[53]

Each of ProShares Ultra 7-10 Year Treasury, ProShares Short 7-10 Year Treasury, ProShares UltraShort 7-10 Year Treasury, ProShares Ultra 20+ Year Treasury, ProShares Short 20+ Year Treasury, ProShares UltraShort 20+ Year Treasury, and ProShares UltraPro Short 20+ Year Treasury is based in whole, or in part, on the ICE U.S. 7-10 Year Bond Index, or ICE U.S. 20+ Year Bond Index, as applicable, owned by Intercontinental Exchange, Inc. or its affiliates and is used by LICENSEE with permission under license by Interactive Data Pricing and Reference Data, LLC, an affiliate of Intercontinental Exchange, Inc. (“Interactive Data”). ICE U.S. 7-10 Year Bond Index™ and ICE U.S. 20+ Year Bond Index™ (collectively, the “Indices”) are trademarks of Intercontinental Exchange, Inc. and its affiliates and used under license.

I under-performed the market in 2017. A crypto market that went up several hundred percent and having read 24 books on finance and trading throughout the process, these were my biggest takeaways. Remember, these are notes I wrote to myself, so they may not work for your trading style. This version was summarized exclusively for CryptoMarket360 – a full version is hyperlinked at the bottom.

Inverse bitcoin contracts are usually denominated in USD terms. So if there's a contract value of $100 then each side -- LONG and SHORT -- puts down some portion of the contract value in margin. The contract is an agreement between traders to pay the other side an amount of bitcoin profit/loss as the price changes. Each contract has an expiration date, and some exchanges have periodic (daily or weekly) dates where the contract period's profits are "settled" even if the contract has not expired.
BitMEX is a derivatives exchange that offers leveraged contracts that are bought and sold in Bitcoin. This is a platform that provides trading in bitcoin derivatives. The derivative traded is a perpetual swap contract, which is a derivative product similar to a traditional Futures Contract. Swap contracts trade like spots, tracking the underlying assets.
Elaborating a bit on the concept of Cryptocurrency and the blockchain effect before we move onto the central theme. As put in words by Daniel Gasteiger on the topic ‘Blockchain Demystified’ at TEDxLausanne,‘A blockchain is nothing but a database, a database that is public, therefore not owned by anybody. Distributed hence not stored centrally on one computer but on many computers across the world. Constantly synchronized to keep the transactions up to date and secured overall by the art of cryptography to make it tamper proof and hacker proof. These four features make this technology exceptional.’ Daniel’s strong belief in the solidarity of the concept of Cryptocurrency motivated him to leave his full-fledged career of 20 years in financial services to focus on the concept of Blockchain. Looking to know more about how to formulate Cryptocurrency strategies? Read our blog on Cryptocurrencies Trading Strategy With Data Extraction Technique. 
•   Valuation Risk — In certain circumstances, portfolio holdings may be valued using techniques other than market quotations. The value established for a portfolio holding may be different from what would be produced through the use of another methodology or if it had been priced using market quotations. Portfolio holding that are valued using techniques other than market quotations, including “fair valued” securities, may be subject to greater fluctuation in their value from one day to the next than would be the case if market quotations were used. In addition, there is no assurance that the Fund could sell a portfolio holding for the value established for it at any time, and it is possible that the Fund would incur a loss because a portfolio holding is sold at a discount to its established value.
application of the PFIC rules, certain excess distributions might have been classified as capital gains. In general, under the PFIC rules, an excess distribution is treated as having been realized ratably over the period during which the Fund held the PFIC shares. If a Fund receives an excess distribution with respect to PFIC stock, the Fund will itself be subject to tax on the portion of an excess distribution that is allocated to prior taxable years without the ability to reduce such tax by making distributions to Fund shareholders, and an interest factor will be added to the tax as if the tax had been payable in such prior taxable years.
Although certain securities exchanges attempt to provide continuously liquid markets in which holders and writers of options can close out their positions at any time prior to the expiration of the option, no assurance can be given that a market will exist at all times for all outstanding options purchased or sold by a Fund. If an options market were to become unavailable, the Fund would be unable to realize its profits or limit its losses until the Fund could exercise options it holds, and the Fund would remain obligated until options it wrote were exercised or expired. Reasons for the absence of liquid secondary market on an exchange include the following: (i) there may be insufficient trading interest in certain options; (ii) restrictions may be imposed by an exchange on opening or closing transactions or both; (iii) trading halts, suspensions or other restrictions may be imposed with respect to particular classes or series of options; (iv) unusual or unforeseen circumstances may interrupt normal operations on an exchange; (v) the facilities of an exchange or the OCC may not at all times be adequate to handle current trading volume; or (vi) one or more exchanges could, for economic or other reasons, decide or be compelled at some future date to discontinue the trading of options (or a particular class or series of options) and those options would cease to exist, although outstanding options on that exchange that had been issued by the OCC as a result of trades on that exchange would continue to be exercisable in accordance with their terms.
An Authorized Participant may place an order to purchase (or redeem) Creation Units (i) through the Continuous Net Settlement clearing processes of NSCC as such processes have been enhanced to effect purchases (and redemptions) of Creation Units, such processes being referred to herein as the “Clearing Process,” or (ii) outside the Clearing Process, though orders for Global Funds (as defined below) may not be placed through the Clearing Process. In either case, a purchase order for a Fund must be received by the following cut-off times (which may be earlier if the relevant Exchange or any relevant bond market closes early). In all cases purchase/redeem procedures are at the discretion of the Advisor and may be changed without notice.
Each Fund’s portfolio turnover rate, to a great extent, will depend on the purchase, redemption and exchange activity of the Fund’s investors. A Fund’s portfolio turnover may vary from year to year, as well as within a year. The nature of the Funds may cause the Funds to experience substantial differences in brokerage commissions from year to year. The overall reasonableness of brokerage commissions is evaluated by the Advisor based upon its knowledge of available information as to the general level of commissions paid by other institutional investors for comparable services. High portfolio turnover and correspondingly greater brokerage commissions depend, to a great extent, on the purchase, redemption, and exchange activity of a Fund’s investors, as well as each Fund’s investment objective and strategies. Consequently, it is difficult to estimate what each Fund’s actual portfolio turnover rate will be in the future. However, it is expected that the portfolio turnover experienced by the Funds from year to year, as well as within a year, may be substantial. A higher portfolio turnover rate would likely involve correspondingly greater brokerage commissions and transaction and other expenses that would be borne by the Funds. The nature of the Funds may cause the Funds to experience substantial differences in brokerage commissions from year to year. The overall reasonableness of brokerage commissions is evaluated by the Advisor based upon its knowledge of available information as to the general level of commissions paid by other institutional investors for comparable services. In addition, a Fund’s portfolio turnover level may adversely affect the ability of the Fund to achieve its investment objective. “Portfolio Turnover Rate” is defined under the rules of the SEC as the value of the securities purchased or securities sold, excluding all securities whose maturities at time of acquisition were one year or less, divided by the average monthly value of such securities owned during the year. Based on this definition, instruments with remaining maturities of less than one year, including swap agreements, options and futures contracts in which the Funds invest, are excluded from the calculation of Portfolio Turnover Rate for each Fund. For those Funds that commenced operations prior to May 31, 2017, each such Fund’s turnover rate information is set forth in the annual report to shareholders. Portfolio turnover rates are also shown in each Fund’s summary prospectus.

As noted above under “Distributions”, a Fund may declare a distribution from net realized capital gains to be payable in additional Fund shares or cash. Even if the Fund does not declare a distribution to be payable in Fund shares, brokers may make available to their customers who own shares the DTC book-entry dividend reinvestment service. If this service is available and used, dividend distributions of both income and capital gains will automatically be reinvested in additional whole shares of the same Fund. Without this service, investors would have to take their distributions in cash. To determine whether the dividend reinvestment service is available and whether there is a commission or other charge for using this service, please consult your broker.

Margin Call - when you run out of bitcoin on your account to cover the contract positions you have taken (your account value doesn't cover the Maintance Margin) you are officially rekt. Some exchanges like CryptoFacilities will merely notify you that you have to deposit more or reduce your positions to increase your margin. Others like BitMEX will liquidate you at this level where the exchange takes over your position to liquidate it into the market to prevent system loss.
The Fund is different from most exchange-traded funds in that it seeks inverse, or “short”, exposure. The Fund may not be suitable for all investors and should be used only by knowledgeable investors. Shareholders should actively manage and monitor their investments, as frequently as daily. As with any shorting strategy that is periodically rebalanced, the return of the Fund over time will likely differ from the inverse of the return of a similar static long investment.
Bitcoin and other cryptocurrencies have evolved from a playful experiment among technical experts to an established and growing branch of the global financial industry. This means that the times in which cryptocurrency traders and investors only concerned themselves with straightforward buying and selling are over. Derivatives are now entering the picture.