Given a document, find the main entity about whom the author is writing. Write the full name if mentioned in the text. Note that URLs in the text have been replaced with [Link].

Bitcoin hit a record high of $16 623 per coin on Thursday  December 7. Two years ago  the idea of buying the virtual currency even at that price was laughable. After a rapid rise in value in 2013  the cryptocurrency's value more than halved by mid-2015. At its lowest point  one bitcoin was equal to about $230. Given the currency's covert nature  the average person still may not understand how buying and selling actually works. Using the app Coinbase  which lets anyone trade bitcoins for a small fee  we decided to find out. A brief warning: If you're going to do this  tell your bank you're about to buy bitcoin. More on that later. And to read more about blockchain  the technology powering bitcoin  click here. View As: One Page Slides
This is what the Coinbase app looks like on an iPhone.
However  Coinbase's interface makes it simple to enter the basic personal information it needs to create your account.
The final step before entering my financial information was two-step verification for security  which  Coinbase  quickly sent to my phone.
To sell the bitcoin   Coinbase  only allows users to pair  their  bank account with the app; a credit or debit card won't suffice.
Since  Coinbase  wasn't linked to my bank account  the transaction needs a few days to process before the money is transferred.
Coinbase

(CNN) The President has excoriated football players who have joined a protest movement by former 49ers quarterback Colin Kaepernick as unpatriotic. But the President is overlooking history -- which shows athletes now lauded as heroes  like  Jackie Robinson and Muhammad Ali   raising  their  voices (or taking a seat) in protests similar to Kaepernick's.
 Jackie Robinson   rightfully celebrated for showing enormous grace under pressure while breaking baseball's color line  refused to stand for the National Anthem after  his  playing days.
Jackie Robinson as a Brooklyn Dodger.
As  he  described in  his  1972 autobiography   Robinson -- like contemporary NFL players --  was protesting against institutional racism.  He  was expressing  his  feelings of alienation from America's system of racial apartheid.
 Robinson 's pugnacious brand of civil rights activism set the stage for succeeding generations of black athletes. Eleven-time NBA champion Bill Russell emerged as one of the most outspoken civil rights advocates of the 1960s  at a time when the city he played in  Boston  represented one of the most racially segregated cities in the North.
Above all  black American athletes are citizens  fathers  brothers  husbands and sons who have a right and responsibility to continue a long struggle for dignity exemplified by Jackie Robinson  Bill Russell and many others.
Jackie Robinson

The Federal Bureau of Investigation  along with the Texas Rangers and the Hidalgo County Sheriff’s Office arrested Democrat State District Judge Rodolfo “Rudy” Delgado.
Dozens of FBI Special Agents descended upon the Judge’s offices. Texas Rangers and Hidalgo County Sheriff’s Deputies were seen alongside the FBI removing trash bags full of evidence and plastic bins from both  Delgado’s  home and the Judge’s office.
 Judge Delgado  is charged with bribery “concerning programs receiving federal funds ” according to a criminal complaint unsealed Monday. The investigation revealed  the judge  would accept bribes in exchange for favorable consideration on cases  he  would oversee in the 93rd state District Court.
A confidential source  who is a licensed attorney  confessed to investigators  he  or she had a history of bribing Delgado since 2008.

Delgado