The U.S. federal investigation was prompted by concerns of possible manipulation during futures settlement dates. The final settlement price of CME bitcoin futures is determined by prices on four exchanges, Bitstamp, Coinbase, itBit and Kraken. Following the first delivery date in January 2018, the CME requested extensive detailed trading information but several of the exchanges refused to provide it and later provided only limited data. The Commodity Futures Trading Commission then subpoenaed the data from the exchanges.[177][178]

One obvious hurdle is the adoption of the technology. To deploy blockchain, financial institutions would essentially have to abandon their current networks and start anew. Trying to integrate the current payment networks with blockchain could prove exceptionally challenging -- to the point where some businesses don't even bother trying to do so. It's also still unclear, with the exception of bitcoin (CCY: BTC-USD), the world's most popular cryptocurrency, if any blockchain aside from bitcoin could survive being scaled to handle a lot of transactions.
A block is record of a new transactions. When a block is completed, it’s added to the chain. Bitcoin owners have the private password (a complex key) to an address on the chain, which is where their ownership is recorded. Crypto-currency proponents like the distributed storage without a middle man — you don’t need a bank to verify the transfer of money or take a cut of the transaction.
Nobody owns the Bitcoin network much like no one owns the technology behind email or the Internet. Bitcoin transactions are verified by Bitcoin miners which has an entire industry and Bitcoin cloud mining options. While developers are improving the software they cannot force a change in the Bitcoin protocol because all users are free to choose what software and version they use.
I joined the bitcoin a few years ago, Remitato floor is the floor I have chosen, after a time watching the Triggers evaluation, I decided to invest in it. With initial investment $ 1000, I bought 500 TRIG for 0.3200023 and after a few weeks worth 0.3400010, tends to go up, the newcomer saw the will to make a professional Trader Coin . But after that time the floor was hacked to make it freezing, I can not access and some other players said the number of coins in the account vanish without trace. After this incident, the TRAG has been falling completely, despite having recovered the account but the value of TRAG after several months did not go up and the floor of Remitano was disastrous despite gaining ownership. Still persist for a few weeks later hoping for the TRAG to go up but the scandal of the floor is not small. And I have since abandoned the Remitano floor.
The Bitcoin world, in my opinion offers such arbitrage opportunities. But they are not as simple to execute as it might seem at first sight. Price differences between exchanges often come for certain reasons. The speed of fiat money transfers and access restrictions are just the most striking ones. You have to find out the concrete opportunities yourself. One place to start is this thread on Bitcoin StackExchange. Also, not every opportunity is available to everyone. Go and have a look at the price differences between exchanges and check out if you can find opportunities.
Bitcoin’s first mover advantage, popularity, and network effect have cemented it as the most popular cryptocurrency with the largest market cap. Rivals like Litecoin may have numerous technical advantages over Bitcoin’s algorithm (see more about that here), but they only hold a fraction of Bitcoin’s market cap and their dwindling communities largely consist of loyalists, speculators, and antagonistic anti-Bitcoin buyers.
A blockchain is a record-keeping system where multiple sources validate an entry before it gets added to the chain of data. Once data has been added, it cannot be changed and the record is distributed to multiple places within the network. Adding a new record (known as a block) to the blockchain sequence requires verification by multiple members connected to the blockchain network. These blocks of data are all linked to one another forming the chain. All transactions are public to those in the blockchain, but all individual identities are hidden.
When the algorithm was created under the pseudonym Satoshi Nakamoto—which in Japanese is as common a name as Steve Smith—the individual(s) set a finite limit on the number of bitcoins that will ever exist: 21 million. Currently, more than 12 million are in circulation. That means that a little less than 9 million bitcoins are waiting to be discovered.
Sure. As discussed, the easiest way to acquire Bitcoin is to buy it on an exchange like Alternately, you can always leverage the "pickaxe strategy". This is based on the old saw that during the 1849 California gold rush, the smart investment was not to pan for gold, but rather to make the pickaxes used for mining. Or, to put it in modern terms, invest in the companies that manufacture those pickaxes. In a crypto context, the pickaxe equivalent would be a company that manufactures equpiment used for Bitcoin mining. You can look into companies that make ASICs miners or GPU miners. 
You also have private blockchains. These are often used for more niche purposes like a business managing data or interacting with its customers. For example, Northern Trust, the financial services firm created one with IBM that it’s been testing for more than a year to store data such as biometric information and other records. In June, it also won a patent for storing meeting notes on the blockchain.
With smart contracts, a certain set of criteria for specific insurance-related situations can be established. In theory, with the implementation of Blockchain technology, you could just submit your insurance claim online and receive an instant automatic payout. Providing, of course, that your claim meets all the required criteria. French insurance giant AXA is the first major insurance group to offer insurance using Blockchain technology. They’ve recently introduced a new flight-delay insurance product that will use smart contracts to store and process payouts. Other insurance companies will surely follow suit.

The bitcoin blockchain is a public ledger that records bitcoin transactions.[67] It is implemented as a chain of blocks, each block containing a hash of the previous block up to the genesis block[a] of the chain. A network of communicating nodes running bitcoin software maintains the blockchain.[31]:215–219 Transactions of the form payer X sends Y bitcoins to payee Z are broadcast to this network using readily available software applications.