The above futures curve shows that in the short term (< 1month) bitcoin-USD futures prices tend to be at or higher than the respective spot prices, with the highest premium to spot reached for futures maturing in approximately 9 days. In the mid term (1-3 months), bitcoin futures prices increase rapidly with mid prices at a premium of approximately 2% compared to the spot price. In the long term (>3months), premiums are positive and prices increase with a relatively stable velocity. Long term prices are at a slightly higher level compared to mid-term maturities. The absolute difference between long-term and short-term premium is positive, revealing an overall positive view about bitcoin among investors for the future. To summarize, this curve reflects modest investor optimism in the short term, due to a possibly high level of volatility around the launch of U.S.-listed bitcoin futures contracts, and an increasingly positive view on bitcoin-USD rates in the medium and long term. In the distant future (>3months) the curve may reflect a belief that the long-term true value of bitcoin will be at a higher level than today, possibly due to increased institutional participation and the maturation of digital assets as a potential asset class.
You’ll find that different exchanges cater to different markets. Today, most countries have at least one cryptocurrency exchange specializing in their own currency. There are exchanges that can accept New Zealand Dollars in exchange for bitcoin, for example. Other exchanges are known for certain pairs. Bithumb, for example, has particularly strong liquidity in the ETH/KRW (South Korean Won) pair at the moment (and it’s easily the most popular cryptocurrency exchange in Korea).
Futures contracts expire on a designated date, referred to as the “expiration date.” Each Fund typically will invest in “lead month” contracts. Lead month contracts are the monthly contracts with the earliest expiration date. Bitcoin futures contracts listed on the CBOE Futures Exchange (“CFE”) or Chicago Mercantile Exchange (“CME”) will be cash settled on their expiration date unless they are “rolled” prior to expiration. Each Fund generally intends to “roll” its bitcoin futures contracts prior to expiration to the next “nearby” bitcoin futures contract. The “nearby” contracts are those contracts with the next closest expiration date. The Funds will incur the costs (or benefits) of continually rolling into the new lead month contracts.
It is also possible that other digital currencies, typically referred to as “alt-coins”, and trading systems could become more widely accepted and used than Bitcoin. In particular, the digital asset “ethereum” has acquired a substantial share of the cryptocurrency market in recent months, which may be in part due to perceived institutional backing and/or potentially advantageous features not incorporated into bitcoin. There are other cryptocurrencies gaining momentum as the price of the bitcoin continues to rise and investors see the cheaper cryptocurrencies as attractive alternatives. The continued rise of these alt-coins can lead to a reduction in demand for bitcoin, which could have an adverse effect on the price of bitcoin and may have an adverse impact on the performance of Bitcoin Instruments and the performance of the Funds.
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:
Although forward currency contracts may be used by the Funds to try to manage currency exchange risks, unanticipated changes in currency exchange rates could result in poorer performance than if a Fund had not entered into these transactions. Even if the Advisor correctly predicts currency exchange rate movements, a hedge could be unsuccessful if changes in the value of a Fund’s position do not correspond to changes in the value of the currency in which its investments are denominated. This lack of correlation between a Fund’s forwards and currency positions may be caused by differences between the futures and currency markets.
Each Fund may enter into swap agreements to invest in a market without owning or taking physical custody of securities. On a typical long swap, the counterparty will generally agree to pay the Fund the amount, if any, by which the notional amount of the swap agreement would have increased in value had it been invested in the particular underlying assets (e.g., an ETF, or securities comprising a benchmark index), plus the dividends or interest that would have been received on those assets. The Fund will agree to pay to the counterparty a floating rate of interest on the notional amount of the swap agreement plus the amount, if any, by which the notional amount would have decreased in value had it been invested in such assets plus, in certain instances, commissions or trading spreads on the notional amount. Therefore, the return to the Fund on such swap agreements should be the gain or loss on the notional amount plus dividends or interest on the assets less the interest paid by the Fund on the notional amount. As a trading technique, the Advisor may substitute physical securities with a swap agreement having investment characteristics substantially similar to the underlying securities. Some Funds may also enter into swap agreements that provide the opposite return of their benchmark or a security. Their operations are similar to that of the swaps disclosed above except that the counterparty pays interest to each Fund on the notional amount outstanding and that dividends or interest on the underlying instruments reduce the value of the swap, plus, in certain instances, each Fund will agree to pay to the counterparty commissions or trading spreads on the notional amount. These amounts are often netted with any unrealized gain or loss to determine the value of the swap.
Certain debt securities may be treated as debt securities that were originally issued at a discount. Original issue discount can generally be defined as the difference between the price at which a security was issued and its stated redemption price at maturity. Original issue discount that accrues on a debt security in a given year generally is treated for federal income tax purposes as interest income that is included in a Fund’s income and, therefore, subject to the distribution requirements applicable to RICs, even though the Fund may not receive a corresponding amount of cash until a partial or full repayment or disposition of the debt security.
JUNK BONDS. “Junk Bonds” generally offer a higher current yield than that available for higher-grade issues. However, lower-rated securities involve higher risks, in that they are especially subject to adverse changes in general economic conditions and in the industries in which the issuers are engaged, to changes in the financial condition of the issuers and to price fluctuations in response to changes in interest rates. During periods of economic downturn or rising interest rates, highly leveraged issuers may experience financial stress that could adversely affect their ability to make payments of interest and principal and increase the possibility of default. In addition, the market for lower-rated debt securities has expanded rapidly in recent years, and its growth paralleled a long economic expansion. At times in recent years, the prices of many lower-rated debt securities declined substantially, reflecting an expectation that many issuers of such securities might experience financial difficulties. As a result, the yields on lower-rated debt securities rose dramatically, but the higher yields did not reflect the value of the income stream that holders of such securities expected. Rather, the risk that holders of such securities could lose a substantial portion of their value as a result of the issuers’ financial restructuring or default. There can be no assurance that such declines will not recur. The market for lower-rated debt issues generally is thinner and less active than that for higher quality securities, which may limit each Fund’s ability to sell such securities at fair value in response to changes in the economy or financial markets. Adverse publicity and investor perceptions, whether or not based on fundamental analysis, may also decrease the values and liquidity of lower-rated securities, especially in a thinly traded market. Changes by recognized rating services in their rating of a fixed income security may affect the value of these investments. Each Fund will not necessarily dispose of a security when its rating is reduced below the rating it had at the time of purchase. However, the Advisor will monitor the investment to determine whether continued investment in the security will assist in meeting each Fund’s investment objective.
In general, excess inclusion income allocated to shareholders (i) cannot be offset by net operating losses (subject to a limited exception for certain thrift institutions), (ii) will constitute unrelated business taxable income (“UBTI”) to entities (including a qualified pension plan, an individual retirement account, a 401(k) plan, a Keogh plan or other tax-exempt entity) subject to tax on UBTI, thereby potentially requiring such an entity that is allocated excess inclusion income, and otherwise might not be required to file a tax return, to file a return and pay tax on such income, and (iii) in the case of a foreign shareholder (defined below), will not qualify for any reduction in U.S. federal withholding tax. A shareholder will be subject to income tax on such inclusions without reference to any exemption therefrom otherwise available under the Code.
You’ll find that different exchanges cater to different markets. Today, most countries have at least one cryptocurrency exchange specializing in their own currency. There are exchanges that can accept New Zealand Dollars in exchange for bitcoin, for example. Other exchanges are known for certain pairs. Bithumb, for example, has particularly strong liquidity in the ETH/KRW (South Korean Won) pair at the moment (and it’s easily the most popular cryptocurrency exchange in Korea).
Amounts not distributed on a timely basis in accordance with a prescribed formula are subject to a nondeductible 4% excise tax at the Fund level. To avoid the tax, each Fund must distribute during each calendar year an amount generally equal to the sum of (1) at least 98% of its ordinary income (not taking into account any capital gains or losses) for the calendar year, (2) at least 98.2% of its capital gains in excess of its capital losses (adjusted for certain ordinary losses) for a one-year period generally ending on October 31
In addition, the Advisor, any of its affiliates or employees and the Funds have a policy not to enter into any agreement or other understanding—whether written or oral—under which brokerage transactions or remuneration are directed to a broker to pay for distribution of a Fund’s shares. The table below sets forth the brokerage commissions paid by each Fund for the period noted for each Fund. Because each of the New Funds was not operational at the end of the Trust’s last fiscal year, information on brokerage commissions paid by the Fund is not included in this SAI.
The Advisor may give consideration to placing portfolio transactions with those brokers and dealers that also furnish research and other execution related services to the Fund or the Advisor. Such services may include, but are not limited to, any one or more of the following: information as to the availability of securities for purchase or sale; statistical or factual information or opinions pertaining to investment; information about market conditions generally; equipment that facilitates and improves trade execution; and appraisals or evaluations of portfolio securities.
Sub or Substratum is another open-source network with a huge focus on decentralizing the web and on “making the internet a free and fair place for the entire world.” This platform allows content creators to freely host their websites or applications on Substratum host, without any censorship blocks. Network users can then “run” Sub nodes and help the content get forwarded to end web users, who can access all Sub content in regular web browsers without any blocks or limits in shape of censorship.
A Fund may cover its sale of a call option on a futures contract by taking a long position in the underlying futures contract at a price less than or equal to the strike price of the call option, or, if the long position in the underlying futures contract is established at a price greater than the strike price of the written (sold) call, the Fund will earmark/segregate liquid instruments equal in value to the difference between the strike price of the call and the price of the future. A Fund may also cover its sale of a call option by taking positions in instruments whose prices are expected to move relatively consistently with the call option. A Fund may cover its sale of a put option on a futures contract by taking a short position in the underlying futures contract at a price greater than or equal to the strike price of the put option, or, if the short position in the underlying futures contract is established at a price less than the strike price of the written put, the Fund will segregate cash or liquid instruments equal in value to the difference between the strike price of the put and the price of the future. A Fund may also cover its sale of a put option by taking positions in instruments whose prices are expected to move relatively consistently to the put option.
•   Market Price Variance Risk — Fund shares are listed for trading on the [                ] Exchange and can be bought and sold in the secondary market at market prices. The market price of shares will fluctuate in response to changes in the value of the Fund’s holdings, supply and demand for shares and other market factors. ProShare Advisors cannot predict whether shares will trade above, below or at a price equal to the value of the Fund’s holdings. Given the fact that shares can be created and redeemed in Creation Units, as defined below, ProShare Advisors believes that large discounts or premiums to the value of the Fund’s holdings should not be sustained. The Fund’s investment results are measured based upon the daily NAV of the Fund. 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.
The Trust reserves the absolute right to reject a purchase order transmitted to it by the Distributor in respect of any Fund if (a) the purchaser or group of purchasers, upon obtaining the Shares ordered, would own 80% or more of the currently outstanding Shares of any Fund; (b) the Deposit Securities delivered are not as specified by ProShare Advisors and ProShare Advisors has not consented to acceptance of an in-kind deposit that varies from the designated Deposit Securities; (c) acceptance of the purchase transaction order would have certain adverse tax consequences to the Fund; (d) the acceptance of the purchase transaction order would, in the opinion of counsel, be unlawful; (e) the acceptance of the purchase order transaction would otherwise, in the discretion of the Trust or ProShare Advisors, have an adverse effect on the Trust or the rights of beneficial owners; (f) the value of a Cash Purchase Amount, or the value of the Balancing Amount to accompany an in-kind deposit, exceeds a purchase authorization limit extended to an Authorized Participant by the Custodian and the Authorized Participant has not deposited an amount in excess of such purchase authorization with the Custodian prior to the relevant cut-off time for the Fund on the transmittal date; or (g) in the event that circumstances outside the control of the Trust, the Distributor and ProShare Advisors make it impractical to process purchase orders. The Trust shall notify a prospective purchaser of its rejection of the order of such person. The Trust and the Distributor are under no duty, however, to give notification of any defects or irregularities in the delivery of purchase transaction orders nor shall either of them incur any liability for the failure to give any such notification.
Margin-trading is what provides the real reward and potential in daytrading bitcoin. You will be able to access the leverage to profit well from relatively small moves in BTC/USD price. High risk, high reward, high potential for loss. However, you need not use Futures only to speculate, hedging on lower leverage is also a great use case for Bitcoin derivatives if you just want to defend your coins. 
  3. Make loans to other persons, except that the acquisition of bonds, debentures or other corporate debt securities and investment in government obligations, commercial paper, pass-through instruments, certificates of deposit, bankers’ acceptances and repurchase agreements and purchase and sale contracts and any similar instruments shall not be deemed to be the making of a loan, and except, further, that the Fund may lend its portfolio securities, provided that the lending of portfolio securities may be made only in accordance with applicable law and the guidelines set forth in the Prospectus and this SAI, as they may be amended from time to time.

The question is: Do we live in a society, or do we just have a list of prices and you decide which ones to pay? Do we all try to get along together and share the world, giving due consideration to each other's needs, or do rich people just get to do whatever they want? Much of the article is devoted to the cool things that the Flatiron Institute is doing, but much of it is devoted to people fretting that there might be a downside to rich individuals determining the direction of basic science and using their money to crowd out traditional universities. Meanwhile Simons sits back and smokes and tosses pennies into the no-smoking jar.
With the increased use of technologies such as the Internet and the dependence on computer systems to perform necessary business functions, the Funds and the digital assets that underline the bitcoin futures contracts in which the Funds invest are susceptible to operational and information security risk. The digital nature of bitcoins and the irreversible nature of bitcoin transactions makes bitcoin an attractive target for theft, hacking and other cyber-attacks. In general, cyber incidents can result from deliberate attacks or unintentional events. Cyber-attacks include, but are not limited to gaining unauthorized access to digital systems for purposes of misappropriating assets such as bitcoin or other cryptocurrencies or gaining access to sensitive information, corrupting data, or causing operational disruption. Cyber-attacks may also be carried out in a manner that does not require gaining unauthorized access, such as causing denial-of-service attacks on websites. Such events have historically correlated with a drop in the price of bitcoin, which may adversely affect your investment in a Fund. Cyber security failures or breaches of a Fund’s third party service provider (including, but not limited to, index providers, the administrator and transfer agent) or the issuers of the bitcoin futures contracts in which the Funds invest, have the ability to cause disruptions and impact business operations, potentially resulting in financial losses, the inability of a Fund’s shareholders to transact business, violations of applicable privacy and other laws, regulatory fines, penalties, reputational damage, reimbursement or other compensation costs, and/or additional compliance costs. In addition, substantial costs may be incurred in order to prevent any cyber incidents in the future. The Funds their service providers, counterparties and other market participants on which the Funds rely could be negatively impacted as a result. While the Funds have established business continuity plans and systems to prevent such cyber-attacks, there are inherent limitations in such plans and systems including the possibility that certain risks have not been identified.
Futures contracts expire on a designated date, referred to as the “expiration date.” Each Fund typically will invest in “lead month” contracts. Lead month contracts are the monthly contracts with the earliest expiration date. Bitcoin futures contracts listed on the CBOE Futures Exchange (“CFE”) or Chicago Mercantile Exchange (“CME”) will be cash settled on their expiration date unless they are “rolled” prior to expiration. Each Fund generally intends to “roll” its bitcoin futures contracts prior to expiration to the next “nearby” bitcoin futures contract. The “nearby” contracts are those contracts with the next closest expiration date. The Funds will incur the costs (or benefits) of continually rolling into the new lead month contracts.
Caspian is a full-stack cryptoasset management platform tying together the biggest crypto exchanges in a single interface, so as to facilitate investments in crypto instruments for newcomers and veterans alike. The joint venture between heavyweights Tora and Kenetic brings to the table a wealth of experience in asset management, accumulated over decades of building and operating trading platforms and technologies.
When a Fund purchases or sells a futures contract, or buys or sells an option thereon, the Fund “covers” its position. To cover its position, a Fund may enter into an offsetting position, earmark or segregate with its custodian bank or on the official books and records of the Fund cash or liquid instruments (marked-to-market on a daily basis) that, when added to any amounts deposited with a futures commission merchant as margin, are equal to the market value of the futures contract or otherwise “cover” its position. When required by law, a Fund will segregate liquid assets in an amount equal to the value of the Fund’s total assets committed to the consummation of such futures contracts. Obligations under futures contracts so covered will not be considered senior securities for purposes of a Fund’s investment restriction concerning senior securities.
Institutional-tier offerings such as those detailed above are seen as much-needed catalysts to stimulate the flow of institutional money into the market, offering heavyweight financial players a less-risky way to buy into assets like bitcoin. For the same reason, custody services like those offered by Coinbase, BitGo and others are necessary for safely storing and managing these investments as well.
When you hear "margin", you may be thinking that you are borrowing money to trade bitcoin futures. This is not quite true. A key feature of these futures contracts is that the leverage comes from counterparties providing it to one another, not from the exchange lending funds and not from any bitcoin being lent from third parties. The contracts are simply like stocks with a market price, which represents the agreements between traders to take the opposing sides of where price of bitcoin will go, so no actual bitcoins are being exchanged per se, however the profit and loss between counterparties is very real!
For each of the following Funds that hold Non-U.S. Investments: the DJ Brookfield Global Infrastructure ETF; the Global Listed Private Equity ETF; the MSCI EAFE Dividend Growers ETF; the MSCI Europe Dividend Growers; the Short Term USD Emerging Markets Bond ETF; and the Merger ETF (each a “Global Fund” and collectively the “Global Funds”), when a purchase order is placed, the Distributor will inform the Advisor and the Custodian. The Custodian shall cause local sub-custodians of the applicable Global Fund to maintain an account into which the Authorized Participant shall deliver, on behalf of itself or the party on whose behalf it is acting, the Deposit Securities “free of payment,” with any appropriate adjustments as advised by the Trust, in accordance with the terms and conditions applicable to such account in such jurisdiction. If applicable, the sub-custodian(s) will confirm to the Custodian that the required Deposit Securities have been delivered and the Custodian will notify the Advisor and Distributor. The Authorized Participant must also make available to the Custodian no later than 12:00 noon Eastern Time (or earlier in the event that the relevant Exchange or the relevant bond markets close early) by the second Business Day after the order is deemed received through the Federal Reserve Bank wire transfer system, immediately available or same day funds in U.S. dollars estimated by the Trust to be sufficient to pay the Balancing Amount next determined after acceptance of the purchase order, together with any applicable Transaction Fees. For Global Funds, the Index Receipt Agent will not make available through the NSCC on each Business Day, the list of the names and the required number of shares of each Deposit Security to be included in the current Portfolio Deposit.
When cash markets are not functioning well, cash and carry arbitrage (and its reverse) futures markets may make the underlying asset accessible to more people. It is possible that A is bullish on bitcoin, but does not wish to go through the hassles of creating a wallet and storing it safely. At the same time, B might be comfortable with bitcoin wallets, but might be unwilling to take bitcoin price risk. Then B can buy bitcoin spot and sell cash settled bitcoin futures to A; the result is that A obtains exposure to bitcoin without creating a bitcoin wallet, while B obtains a risk free investment (a synthetic T-bill). Similarly, suppose C wishes to bet against bitcoin, but does not have the ability to short it; while D has no views on bitcoin, but has sufficient access to the cash market to be able to short bitcoin. Then D can take a risk free position by shorting bitcoin in the cash market and buying bitcoin futures from C who obtains a previously unavailable short position.
•   Active Management Risk — The performance of actively managed funds reflects, in part, the ability of ProShare Advisors to select investments and make investment decisions that are suited to achieving the Fund’s investment objective. ProShare Advisors’ judgments about the Fund’s investments may prove to be incorrect. If the investments selected and strategies employed by ProShare Advisors fail to produce the intended results, the Fund may not achieve its investment objective and could underperform other funds with a similar investment objective and/or strategies.
On March 18, 2013, the Financial Crimes Enforcement Network (“FinCEN”) a bureau of the US Department of the Treasury, issued interpretive guidance relating to the application of the Bank Secrecy Act to distributing, exchanging and transmitting “virtual currencies.” More specifically, it determined that a user of virtual currencies (such as bitcoin) for its own account will not be considered a money service business (“MSB”) or be required to register, report and perform recordkeeping; however, an administrator or exchanger of virtual currency must be a registered money services business under FinCEN’s money transmitter regulations. As a result, Bitcoin Exchanges that deal with U.S. residents or otherwise fall under U.S. jurisdiction are required to obtain licenses and comply with FinCEN regulations. FinCEN released additional guidance clarifying that, under the facts presented, miners acting solely for their own benefit, software developers, hardware manufacturers, escrow service providers and investors in bitcoin would not be required to register with FinCEN on the basis of such activity alone, but that Bitcoin Exchanges, certain types of payment processors and convertible digital asset administrators would likely be required to register with FinCEN on the basis of the activities described in the October 2014 and August 2015 letters. FinCEN has also taken significant enforcement steps against companies alleged to have violated its regulations, including the assessment in July 2017 of a civil money penalty in excess of $110 million against BTC-e for alleged willful violation of U.S. anti-money laundering laws.

BB, B, CCC, CC, and C – Obligations rated ‘BB’, ‘B’, ‘CCC’, ‘CC’, and ‘C’ are regarded as having significant speculative characteristics. ‘BB’ indicates the least degree of speculation and ‘C’ the highest. While such obligations will likely have some quality and protective characteristics, these may be outweighed by large uncertainties or major exposures to adverse conditions.
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The question is: Do we live in a society, or do we just have a list of prices and you decide which ones to pay? Do we all try to get along together and share the world, giving due consideration to each other's needs, or do rich people just get to do whatever they want? Much of the article is devoted to the cool things that the Flatiron Institute is doing, but much of it is devoted to people fretting that there might be a downside to rich individuals determining the direction of basic science and using their money to crowd out traditional universities. Meanwhile Simons sits back and smokes and tosses pennies into the no-smoking jar.
Poloniex is an asset exchange based in the US. Trading on Poloniex is secure and allows traders to explore new and trendy coins which are up for speculation. It offers high volume margin trading and lending service for major crypto assets. Reportedly, the largest user base for trading on this site comes from Russia (6.06%) and US (24.84%). A differentiating factor about the site is that it does not support fiat currency.
A Bitcoin (spot or futures) exchange (like any online trading firm) charges its clients a fee to carry out trading activities. As exchanges face the risk of hacking and theft, it is wise not to trust an exchange with all your coins. You should split and keep part of them in other devices or cold storage. Now with bitcoin futures being offered by some of the most prominent marketplaces, investors, traders and speculators are all bound to benefit. These centralized marketplaces will facilitate trade based on a trader’s outlook for bitcoin prices, gain exposure to bitcoin prices or hedge their existing bitcoin positions. Overall, the launching of bitcoin futures by Cboe and CME will facilitate price discovery and price transparency, enable risk-management via a regulated bitcoin product and give a further push to bitcoin as an accepted asset class. (For more, see: The Risks Of Buying Bitcoins.)
An initial coin offering (ICO) is a controversial means of raising funds for a new cryptocurrency venture. An ICO may be used by startups with the intention of avoiding regulation. However, securities regulators in many jurisdictions, including in the U.S., and Canada have indicated that if a coin or token is an "investment contract" (e.g., under the Howey test, i.e., an investment of money with a reasonable expectation of profit based significantly on the entrepreneurial or managerial efforts of others), it is a security and is subject to securities regulation. In an ICO campaign, a percentage of the cryptocurrency (usually in the form of "tokens") is sold to early backers of the project in exchange for legal tender or other cryptocurrencies, often bitcoin or ether.[62][63][64]
Speculating and hedging bitcoin with futures has never been easier. Spot has lower leverage which means you have to risk more of your capital with exchanges. Margin fees are very expensive on Bitfinex and Kraken when you are borrowing funds and paying up to 0.1% per day to be in a position. Futures contracts on the other hand have no holding fees associated. You pay a fee to enter the contract, and you pay a fee to exit the contract. Your profit or loss comes from the change in the price you pay.
•   Rolling Futures Contract Risk — The Fund will invest in and have exposure to bitcoin futures contracts and is subject to risks related to “rolling” such contracts. Rolling occurs when the Fund closes out of a futures contract as it nears its expiration and replaces it with a contract that has a later expiration. The Fund does not intend to hold futures contracts through expiration, but instead intends to “roll” its futures positions. When the market for these futures contracts is such that the prices are higher in the more distant delivery months than in the nearer delivery months, the sale during the course of the rolling process of the more nearby contract would take place at a price that is lower than the price of the more distant contract. This pattern of higher futures contract prices for longer expiration contracts is often referred to as “contango.” Alternatively, when the market for futures contracts is such that the prices are higher in the nearer months than in the more distant months, the sale during the course of the rolling process of the more nearby contract would take place at a price that is higher than the price of the more distant contract. This pattern of higher futures prices for shorter expiration futures contracts is referred to as “backwardation.” Extended periods of contango could cause significant losses for the Fund. The Advisor will utilize active management techniques to seek to mitigate the negative impact or, in certain cases, benefit from the contango or backwardation present in the various futures contract markets, but there can be no guarantee that it will be successful in doing so.
Some Centra investors have their doubts, and a plaintiffs' law firm has brought a class action complaint against Centra demanding the investors' money back. The complaint is fun -- Centra had a “Blog/Media Bounty” program to "Reward Experienced Writers who write quality Reviews, Articles About the Centra Project and the ICO crowdsale" -- but not that fun, because the plaintiffs' lawyers don't actually need to prove that Centra was a scam. Their job is much easier: All they need to do is prove that the tokens Centra sold in its initial coin offering were securities. If they were securities, they were sold illegally: They were offered publicly without being registered with the Securities and Exchange Commission, or being exempt from registration. And one remedy for the illegal sale of securities is that the buyers can demand their money back -- whether or not Centra is legitimate, whether or not it is actually using the money to build a cryptocurrency debit card, whether or not it made any misleading statements in the ICO.
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. 
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.
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]
If you are “going long” on Bitcoin, you assume that Bitcoin prices will go up. And if you expect Bitcoin prices to go up, you are interested in buying call options – options that enable you to buy Bitcoin at a predetermined price in the future. For example, if the current Bitcoin price is 5,000 USD and you expect it to rise to 8,000 USD 6 months from now, you would certainly pay good money for a call option that allows you to purchase Bitcoin for 5000 USD in 6 months, when everyone else is buying for 8,000 USD.
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