When the Advisor determines that the price of a security is not readily available or deems the price unreliable, it may, in good faith, establish a fair value for that security in accordance with procedures established by and under the general supervision and responsibility of the Trust’s Board of Trustees. The use of a fair valuation method may be appropriate if, for example, market quotations do not accurately reflect fair value for an investment, an investment’s value has been materially affected by events occurring after the close of the exchange or market on which the investment is principally traded (for example, a foreign exchange or market), a trading halt closes an exchange or market early, or other events result in an exchange or market delaying its normal close.

Maintenance Margin - this is the % of the position value you have to have in your account at the very minimum to avoid being Margin Called.  In some exchanges, margin call will mean you get notified and must deposit more margin to avoid liquidation (like CryptoFacilities). On other exchanges you will at this point be liquidated out of your position. So if maintenance margin is 5%, then the 0.05 BTC of your initial margin will need to be kept for the position to be alive.

Daniels Trading Now Offers Bitcoin Futures Trading - With values eclipsing $15,000 apiece, Bitcoin has seized the attention of the financial community and transformed many skeptics into enthusiastic participants. The surrounding buzz has given rise to deep cash markets and exceptional volatility — two characteristics especially attractive to traders and investors. In order to satisfy public demand for all things Bitcoin, the CME Group, Cboe, and Nasdaq decided to launch standardized Bitcoin derivatives.
The first decentralized cryptocurrency, bitcoin, was created in 2009 by pseudonymous developer Satoshi Nakamoto. It used SHA-256, a cryptographic hash function, as its proof-of-work scheme.[16][17] In April 2011, Namecoin was created as an attempt at forming a decentralized DNS, which would make internet censorship very difficult. Soon after, in October 2011, Litecoin was released. It was the first successful cryptocurrency to use scrypt as its hash function instead of SHA-256. Another notable cryptocurrency, Peercoin was the first to use a proof-of-work/proof-of-stake hybrid.[18] IOTA was the first cryptocurrency not based on a blockchain, and instead uses the Tangle.[19][20] Many other cryptocurrencies have been created though few have been successful, as they have brought little in the way of technical innovation.[21] On 6 August 2014, the UK announced its Treasury had been commissioned to do a study of cryptocurrencies, and what role, if any, they can play in the UK economy. The study was also to report on whether regulation should be considered.[22]

Mathematically, to regain a 50% loss you need the price to rise 100% (double) so don’t let yourself get there. Psychologically, you force yourself to trade to make up for the losses, and under pressure, you won’t make the best decisions. Cut losses early and re-evaluate your reasons for the trade, go back in later on, at a lower price if needed. Don’t take profits early, wait for a drop – this is a good enough place to close the trade

  •   Bitcoin is available for trading 24-hours a day globally and, as such, the price of bitcoin may change dramatically when the market for bitcoin futures contracts is closed or when Fund shares are not available for trading on the Exchange. The price of bitcoin may change dramatically at times when investors are unable to buy or sell Fund shares.

of the calendar year, and (3) all such ordinary income and capital gains that were not distributed in previous years. For purposes of the required excise tax distribution, ordinary gains and losses from the sale, exchange, or other taxable disposition of property that would be properly taken into account after October 31 are generally treated as arising on January 1 of the following calendar year. Also, for these purposes, the Fund will be treated as having distributed any amount on which it is subject to corporate income tax for the taxable year ending within the calendar year. The Funds intend generally to make distributions sufficient to avoid imposition of the excise tax, although the Funds reserve the right to pay an excise tax rather than make an additional distribution when circumstances warrant (for example, the payment of the excise tax amount is deemed to be de minimis).
The Distribution and Service Plan and Distribution and Service Agreements will remain in effect for a period of one year and will continue in effect thereafter only if such continuance is specifically approved annually by a vote of the Trustees. All material amendments of the Distribution and Service Plan must also be approved by the Board. The Distribution and Service Plan may be terminated at any time by a majority of the Board or by a vote of a majority of the outstanding Shares, as defined under the 1940 Act, of the affected Fund. The Distribution and Service Agreements may be terminated at any time, without payment of any penalty, by vote of a majority of the Independent Trustees or by a vote of a majority of the outstanding Shares, as defined under the 1940 Act, of the affected Fund on not less than 60 days’ written notice to any other party to the Distribution and Service Agreements. The Distribution and Service Agreements shall terminate automatically if assigned. The Board has determined that, in its judgment, there is a reasonable likelihood that the Distribution and Service Plan will benefit the Funds and holders of Shares of the Funds. In the Board’s quarterly review of the Distribution and Service Plan and Distribution and Service Agreements, the Trustees will consider their continued appropriateness and the level of compensation and/or reimbursement provided therein.
Let’s say Larry owns one bitcoin and the current price is $16,600, be believes the price is overdone to the upside for a short period of time.  This is a fictional example, so don’t beat me up on the outlook, you can criticize Larry, but he’s made up too.  Larry has a futures account and sees that he can sell short a January XBT Future at $17,600.  He decides to do this and is now short 1 January XBT Future at $17,600. 
SEI Investments Distribution Co. (“SEI”) serves as the distributor and principal underwriter in all fifty states and the District of Columbia. SEI is located at One Freedom Valley Drive, Oaks, PA 19456. The Distributor has no role in determining the investment policies of the Trust or any of the Funds, or which securities are to be purchased or sold by the Trust or any of the Funds. For the fiscal years ended May 31, 2015, May 31, 2016 and May 31, 2017, ProShare Advisors paid $1,858,542, $787,325, and $769,839 respectively, to the Distributor as compensation for services.

Futures markets create an immense amount of flexibility. They enable investors to readily bet on an asset or bet against it (go long or go short), and they are usually characterised by an immense amount of leverage. In the case of bitcoin, this means one can trade a high volume of coins while only paying for a fraction of them, essentially operating with borrowed money. Leverage is used to amplify profits on a small volume of assets, but it is a double-edged sword in that it also amplifies losses.

RD – Restricted default. ‘RD’ ratings indicate an issuer that in Fitch’s opinion has experienced an uncured payment default on a bond, loan or other material financial obligation but which has not entered into bankruptcy filings, administration, receivership, liquidation or other formal winding-up procedure, and which has not otherwise ceased operating. This would include:
If you want to do scalping, then shorter-term expiree contracts that settle really soon would be fine. Keep in mind, the normal state of futures markets is "contango", which means that longer dated contracts will have a premium to the current spot rate, to reflect the interest rate differential and time preference.  This means you will see Weeklies maybe with a $1-2 preium and Quarterlies (assuming they expire months from now) with a $5-8 premium.  As an example we have Quarterlies contracts right now at OKCoin that settle on December 25. So we're just starting December now, that means that even though these are "Quarterlies" contracts by classification, they are expiring not 3 months from now, but 1 month from now. Don't mix up the settlement expiration date with the naming convention. 
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:

•   Liquidity Risk — In certain circumstances, such as the disruption of the orderly markets for the bitcoin futures contracts in which the Fund invests, the Fund might not be able to acquire or dispose of certain holdings quickly or at prices that represent true market value in the judgment of ProShare Advisors. Markets may be disrupted by a number of events, including but not limited to cyber-attacks, economic crises, natural disasters, new legislation, or regulatory changes inside or outside the U.S.
Futures contracts with a longer term to expiration may be priced higher than futures contracts with a shorter term to expiration, a relationship called “contango.” Conversely, futures contracts with a longer term to expiration may be priced lower than futures contracts with a shorter term to expiration, a relationship called “backwardation.” Contango and backwardation have different impacts on ProShares Bitcoin/Blockchain ProShares Bitcoin Futures Strategy ETF, ProShares Bitcoin Futures/Equity Strategy ETF and ProShares Bitcoin/Blockchain Strategy ETF (each, a “Bitcoin Fund”) and ProShares Short Bitcoin Futures Strategy ETF (the “Short Bitcoin Fund”).

Interest Rate Risk — The Fund intends to invest a substantial portion of its assets in U.S. Treasury securities and is subject to interest rate risk. Interest rate risk is the risk that debt securities may fluctuate in value due to changes in interest rates. Commonly, investments subject to interest rate risk will decrease in value when interest rates rise and increase in value when interest rates decline. The value of securities with longer maturities may fluctuate more in response to interest rate changes than securities with shorter maturities. A wide variety of factors can cause interest rates to rise (e.g., central bank monetary

!! WARNING !!! Note that on CryptoFacilities each contract is denominated by 1 BTC. So if you bought a fraction of BTC you can NOT perform a perfect hedge of the value. If you round the BTC you bought with start capital down, you will have slight overexposure LONG with the left-over BTC. If you round up and short an extra contract, you will have slight overexposure SHORT.