​Trading these futures instead of actual bitcoins is smart because you are able to access higher leverage by entering contracts with counterparties, while keeping your coins safe in cold storage or elsewhere. Additionally, unlike trading margin on Kraken or Bitfinex, you do NOT have to pay interest on the leverage you have! This is the result of the counterparty structure of futures. High leverage trading, low-fees, and high profit potential.
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

Investors purchasing and selling shares in the secondary market may not experience investment results consistent with those experienced by Authorized Participants creating and redeeming directly with the Fund. To the extent that exchange specialists, market makers, Authorized Participants, or other participants are unavailable or unable to trade the Fund’s shares and/or create or redeem Creation Units, trading spreads and the resulting premium or discount on the Fund’s shares may widen and the Fund’s shares may possibly be subject to trading halts and/or delisting.
Altcoins is the general term associated with the cryptocurrencies launched after Bitcoin’s success. At first, these were mere copies mimicking the original Bitcoin. Today, there are over 1,000 of these, and the list just keeps growing. Most crypto coins are launched following an ICO (Initial Coin Offering – a form of crowdfunding) in which the developers raise cash by offering a limited number of initial coins to finance technological development. So far, besides the list below, we can find names, such as Namecoin, Peercoin, Bytecoin, Deutsche eMark, Novacoin, Cryptogenic Bullion, Quark, DarkCoin and Mangocoinz (for smartphones).
Each Fund, from time to time, in the ordinary course of business, may purchase securities on a when-issued or delayed-delivery basis (i.e., delivery and payment can take place between 30 and 120 days after the date of the transaction). These securities are subject to market fluctuations and no interest accrues to the purchaser during this period. At the time a Fund makes the commitment to purchase securities on a when-issued or delayed-delivery basis, the Fund will record the transaction and thereafter reflect the value of the securities, each day, in determining the Fund’s NAV. Each Fund will not purchase securities on a when-issued or delayed-delivery basis if, as a result, it determines that more than 15% of the Fund’s net assets would be invested in illiquid securities. At the time of delivery of the securities, the value of the securities may be more or less than the purchase price.
It bears repeating -- when trading futures on leverage, you are not "borrowing" the money, so you don't have to pay a financing rate on your positions. Even though you are 100x exposed, you don't have to pay 100x financing (unless you're trading the perpetual swap, which is not a futures contract, but has similar characteristics). Since bitcoin futures do tend to trade at a premium, you are in a way paying an implied interest rate in the contract, because if you want to go long, you have to pay above spot, so you pay the interest up front in the contract, in a way.
•   Futures Position Limit Risk — Limits on the amount of futures any one entity can hold may negatively impact the Fund’s ability to meet its investment objective if such limits are reached and exceptions to such limits are not granted. Currently the position limits for bitcoin futures contracts are much lower than they are for most other futures contracts.
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As a shareholder on a Fund record date, you will earn a share of the investment income and net realized capital gains, if any, derived from a Fund’s direct security holdings and derivative instruments. You will receive such earnings as either an income dividend or a capital gains distribution. Each Fund intends to declare and distribute to its shareholders at least annually its net investment income, if any, as well as net realized capital gains, if any. Subject to Board approval, some or all of any net realized capital gains distribution may be declared payable in either additional shares of the respective Fund or in cash.

and other factors. Thus, to the extent a Fund invests in swaps that use an ETF as the reference asset, that Fund may be subject to greater correlation risk and may not achieve as high a degree of correlation with its index as it would if the Fund used only swaps on the underlying index. The Advisor, under the supervision of the Board of Trustees, is responsible for determining and monitoring the liquidity of the Funds’ transactions in swap agreements.
Each Fund, except for the S&P 500 Dividend Aristocrats ETF, the S&P MidCap 400 Dividend Aristocrats ETF, the Russell 2000 Dividend Growers ETF, the MSCI EAFE Dividend Growers ETF, the MSCI Europe Dividend Growers ETF, the MSCI Emerging Markets Dividend Growers ETF, the DJ Brookfield Global Infrastructure ETF, the Equities for Rising Rates ETF, the S&P 500 Ex-Energy ETF, the S&P 500 Ex-Financials ETF, the S&P 500 Ex-Health Care ETF, the S&P 500 Ex-Technology ETF, the High Yield—Interest Rate Hedged, the Investment Grade—Interest Rate Hedged and the Short Term USD Emerging Markets Bond ETF, is a “non-diversified” series of the Trust. A Fund’s classification as a “non-diversified” investment company means that the proportion of the Fund’s assets that may be invested in the securities of a single issuer is not limited by the 1940 Act. Notwithstanding each Fund’s status as a “non-diversified” investment company under the 1940 Act, each Fund intends to qualify as a RIC accorded special tax treatment under the Code, which imposes its own diversification requirements on these Funds that are less restrictive than the requirements applicable to the “diversified” investment companies under the 1940 Act. A Fund’s ability to pursue its investment strategy may be limited by that Fund’s intention to qualify as a RIC and its strategy may bear adversely on its ability to so qualify. For more details, see “Taxation” below. With respect to a “non-diversified” Fund, a relatively high percentage of such a Fund’s assets may be invested in the securities of a limited number of issuers, primarily within the same economic sector. That Fund’s portfolio securities, therefore, may be more susceptible to any single economic, political, or regulatory occurrence than the portfolio securities of a more diversified investment company.

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.
If you are doing any active trading, set stop losses. For any coins not in your medium or long-term holds, always set stop losses. This is important for several reasons — the most obvious is mitigating your losses. But more importantly, you force yourself to decide on a point of acceptable loss, and because you now have a reference point, you are able to measure your effectiveness to keep or adjust for future trades. Sometimes, during a market dip, altcoins can plummet, and stop losses can lead to profitability by automatically selling for fiat that you can use to re-enter at lower prices.
Although currently bitcoin is not regulated or is lightly regulated in most countries, including the United States, some countries have and one or more countries may in the future take regulatory actions that severely restrict the right to acquire, own, hold, sell or use bitcoin or to exchange bitcoin for fiat currency. Such restrictions could have an adverse effect on the price of bitcoin and the Bitcoin Instruments in which the Funds invest and may adversely affect an investment in the Funds.
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.