It can often be confusing to traders who are using multiple futures exchanges with different contract types -- inverse and qunato, dailies or quarterlies, 5x or 100x -- so people wonder: what should I trade? Well, it depends on what your goals are. If you are trying to do a little hedge for a medium term, you would want to use a quarterlies expiration contract instead, because otherwise you'd have to reopen shorter-term contracts after they expire and settle. 
In a possible lead-up to its plans on becoming an ATS, on March 26, 2018, San Francisco-based Coinbase announced it was adding support for ERC20 into all its trading platforms. ERC20 is the Ethereum technical standard that the majority of ICO tokens are based on. “This paves the way for supporting ERC20 assets across Coinbase products in the future, though we aren’t announcing support for any specific assets or features at this time,” Coinbase said in a blog post.
The CME Group contract (symbol "BTC") began trading on December 18, 2017, building off of the success of the BRR and demand for a regulated trading venue for the digital asset market. The contract is cash-settled, based on the CME CF Bitcoin Reference Rate (BRR) which serves as a once-a-day reference rate of the U.S. dollar price of bitcoin. Bitcoin futures are listed on and subject to the rules of CME.2
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.
While it is likely that regulatory laws surrounding ICOs will only be settled in court (perhaps even the Supreme Court), if ICO tokens are legally classified as securities, any exchange that wants to list those tokens needs to either register as a national securities exchange or operate under an exemption and set itself up as an alternative trading system (ATS).
The Fund is an actively managed exchange traded fund. The Fund seeks to achieve its investment objective by investing substantially all of its assets in U.S. large capitalization equity securities and bitcoin futures contracts. The Fund is designed to benefit when the prices of U.S. large capitalization equity securities and bitcoin futures contracts increases. The Fund generally seeks to have 70% of the value of its portfolio invested in the equity securities of the 500 largest U.S. public companies and 30% of the value of its portfolio invested in bitcoin futures contracts. The Fund does not invest directly in bitcoin.

A cryptocurrency (or crypto currency) is a digital asset designed to work as a medium of exchange that uses strong cryptography to secure financial transactions, control the creation of additional units, and verify the transfer of assets.[1][2][3] Cryptocurrencies are a kind of alternative currency and digital currency (of which virtual currency is a subset). Cryptocurrencies use decentralized control[4] as opposed to centralized digital currency and central banking systems.[5] The decentralized control of each cryptocurrency works through distributed ledger technology, typically a blockchain, that serves as a public financial transaction database.[6][7]

At the expiration of the contract you are trading, all positions get closed out and settled. Different exchanges use different anchors to settle against. To avoid manipulation, most of them use an index. OKCoin uses a custom 6-exchange index (3 chinese, 3 Western), while BitMEX, Deribit, Coinpit, and CryptoFacilities use a multi-spot-exchange Index to settle all of its contracts at expiration. This minimizes the risk of any manipulation if contracts settled on a single exchange's price, but it also makes it more difficult to manage your hedges since there's no way to "buy" or "sell" an index. No system is perfect, and each one offers different unique pro's and con's, just like your selection of contract type and length. So depending on your case you may want something different than someone else.
•   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.
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
In May 2018 Bitcoin Gold (and two other cryptocurrencies) were hit by a successful 51% hashing attack by an unknown actor, in which exchanges lost estimated $18m.[90] In June 2018, Korean exchange Coinrail was hacked, losing US$37 million worth of altcoin. Fear surrounding the hack was blamed for a $42 billion cryptocurrency market selloff.[91] On 9 July 2018 the exchange Bancor had $23.5 million in cryptocurrency stolen.[92]
Note that any losses on the bitcoin position is offset by the short position in the Jan XBT Futures contract.  Because Jan XBT was trading at a $1,000 premium to spot bitcoin, the profit for this trade is equal to that difference.  Now, keep in mind if bitcoin doubles between now and January 17 settlement the maximum profit is $1000.  Larry is giving up some upside to assure a return of $1000.

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.
Since a portion of the Fund’s assets are invested in short positions in bitcoin futures contracts, the Fund will likely decline in value when the price of bitcoin futures contracts goes up (unless such losses are offset by gains in the value of the Fund’s positions in other investments), a result that is the opposite from the results of taking long positions in bitcoin futures contracts.

Were Centra's tokens securities? Well, yes, obviously. We talked last week about the Securities and Exchange Commission's enforcement action against Munchee, an initial coin offering vaguely similar to Centra's in that it featured "utility tokens" to be used in a blockchain ecosystem that did not yet exist, sold on promises of speculative returns. The SEC brusquely and correctly dismissed the notion that such "utility tokens" were not securities, and I suspect any court will agree. Also, while Centra occasionally remembered to call its tokens "utility-based tokens" and "not securities, shares or investments," it often forgot. From the complaint:

Bitcoin’s adoption has been on a generally continuous climb since bitcoin first gained mass media attention in 2013. Businesses are starting to accept bitcoin as payment, either directly or, more commonly, through an intermediary service which converts bitcoin payments into local currency. The adoption of bitcoin as a means of payment, however, has been limited when compared with the increase in the price of bitcoin as determined by the Bitcoin Exchange Market, indicating that the majority of bitcoin’s use is for investment and speculative purposes. The continued adoption of bitcoin will require growth in its usage as a means of payment and in the Bitcoin Blockchain for various applications.
As a result of compounding, for periods greater than one day, the use of leverage tends to cause the performance of a Fund to vary from its benchmark performance times the stated multiple or inverse multiple in the Fund’s investment objective, before accounting for fees and fund expenses. Compounding affects all investments, but has a more significant impact on geared funds. Four factors significantly affect how close daily compounded returns are to longer-term benchmark returns times the fund’s multiple: the length of the holding period, benchmark volatility, whether the multiple is positive or inverse, and its leverage level. Longer holding periods, higher benchmark volatility, inverse exposure and greater leverage each can lead to returns farther from the multiple times the benchmark return. As the tables below show, particularly during periods of higher benchmark volatility, compounding will cause longer term results to vary from the benchmark performance times the stated multiple in the Fund’s investment objective. This effect becomes more pronounced as volatility increases.
Under an investment advisory agreement between ProShare Advisors and the Trust, on behalf of each Fund (the “Agreement” or “Advisory Agreement”), each Fund (other than the Morningstar Alternatives Solution ETF, the Global Listed Private Equity ETF, the Short Term USD Emerging Markets Bond ETF, the Inflation Expectations ETF and the CDS Short North American HY Credit ETF) pays ProShare Advisors a fee at an annualized rate, based on its average daily net assets, of 0.75%. ProShare Advisors has entered into an Advisory Fee Waiver Agreement for each of these Funds that reduces the annualized rate based on its average daily net assets, as follows: 0.75% of the first $4.0 billion of average daily net assets of the Fund; 0.70% of the average daily net assets of the Fund over $4.0 billion to $5.5 billion; 0.65% of the average daily net assets of the Fund over $5.5 billion to $7.0 billion; 0.60% of the average daily net assets of the Fund over $7.0 billion to $8.5 billion; and 0.55% of the average daily net assets of the Fund over $8.5 billion. The fee waiver arrangement will remain in effect through at least September 30, 2018 and prior to such date ProShare Advisors may not terminate the arrangement without the approval of the Board.
Ultimately, if you want to make money with crypto you have a couple of options. The easiest thing to do is to build a diversified portfolio of carefully selected coins and then to simply wait a couple of years. However, this is not the most effective way to make mad money. If you want to truly crush it at crypto, you need access to truly knowledgable people.
•   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.
Note that you could just keep bitcoin on CryptoFacilities waiting to make the trade so you don't have to wait to move the bitcoin you bought over. This is called see-saw arbitrage model, where you keep funds on both exchanges to avoid having to wait. This is fine, but you can't ignore that there is extra capital being used in the play, so it affects your rate of return and capital utilisation. We will not use this method, we will do a full, complete, legitimate arbitrage process.