Darknet markets present challenges in regard to legality. Bitcoins and other forms of cryptocurrency used in dark markets are not clearly or legally classified in almost all parts of the world. In the U.S., bitcoins are labelled as "virtual assets". This type of ambiguous classification puts pressure on law enforcement agencies around the world to adapt to the shifting drug trade of dark markets.[94]
Sia is the very first decentralized storage platform that’s based on and secured by the blockchain technology. Through the blockchain tech, Sia can provide much reliable data storage options that do not have a single point of failure, can offer more storage space – at much lower costs than traditional cloud storage providers. Besides the obvious, investors are readily jumping on the Sia-train for one more reason: Privacy. Unlike cloud-storage provides, Sia’s tech gives you all the keys to your own (encrypted) data, and mandates that no third party will control nor access your files.
In the course of providing advisory services, the Advisor may simultaneously recommend the sale of a particular security for one account while recommending the purchase of the same security for another account if such recommendations are consistent with each client’s investment strategies. The Advisor also may recommend the purchase or sale of securities that may also be recommended by ProFund Advisors LLC, an affiliate of the Advisor.
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.
These days, all of the BTC/USD contracts trading at active futures markets are inverse, as mentioned in the beginning of this guide. The only differences between the exchanges is how they trigger liquidations and the procedure for handling margin calls. They all use Bitcoin as the currency, of course, and you can use the table below for a basic feature comparison:
There are two "types" of bitcoin -- Quanto and Inverse. Vast majority of bitcoin futures contracts are INVERSE, not Quanto. This means that the PNL is smoothed in USD terms, so that the contract value is maintained through price fluctuations. Put simply, it allows you to make a perfect USD-value hedge when you short with Bitcoin, which makes it ideal for speculators and hedgers. This means that if the BTC/USD value drops 1% you will earn more raw BTC than if it increases 1%. This is because when the price is falling, the USD value of the BTC is also falling, so the payout mathematically adjusts for this and increases as the price falls, compensating for the reduced USD value.
You can find additional information about the Funds in the current Statement of Additional Information (“SAI”), dated October 1, 2017, as may be amended from time to time, which has been filed electronically with the Securities and Exchange Commission (“SEC”) and is incorporated by reference into, and is legally a part of, this Prospectus. A copy of the SAI is available, free of charge, online at ProShares.com. You may also receive a free copy of the SAI or make inquiries to ProShares by writing us at the address set forth above or calling us toll-free at the telephone number set forth above.
The price of bitcoin may change sharply while the market for certain Bitcoin Instruments is closed or when the exchange on which Fund shares are traded is closed. Although the Funds will not invest directly in bitcoin, such price changes could impact the price and volatility of the Bitcoin Instruments in which the Funds invest and, therefore, could have a negative impact on your investment in the Funds.

•   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.
Traders A and B in the previous example are hedgers. However, futures contracts, once they exist, can also be bought and sold in their own right. This is where futures get interesting for speculators. Say that Speculator X believes the price of a ton of pork belly will rise to 1,200 USD in 3 months’ time, so buying the futures contract at 1,000 USD is a good deal. He can then sell the contract to bacon producers who want to buy pork bellies at 1,000 USD. The option to buy at a specified price in the future is known as a call option. The price of call options rise when traders assume that the price of the underlying asset will rise.