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

Shaun White Wins Gold In Halfpipe At The Winter Olympics
Updated at 10:15 p.m.  ET
Shaun White  pulled off a gold-medal comeback in the halfpipe  and Japan's Ayumu Hirano won silver on the strength of a phenomenal second run.
CORRECTION: An early version of this story reported that  White  had won silver — that was reported after the second run had completed. On his third run   White  won gold.
 White  missed out on a medal back in 2014  when  he  was hurt at the Sochi Games.  He 's now the only snowboarder ever to win three gold medals at the Olympics. And  he  did it by winning the 100th gold medal for the U.S. Winter Olympic team.
After the Japanese snowboarder's rousing run  the pressure shifted to James and  White . James seemed to take a very deep breath before he set off on his second run. The first section was great — but he couldn't get a clean landing on one of his final tricks.  White  came out with energy and speed — but  he  fell midway through  and mustered only 55 points.
The situation reversed in the third and final run  when  White  earned a 97.75 and both of  his  top rivals fell during  their  attempts.
This is the second Olympic medal for Hirano; he won silver in Sochi. He is also the reigning X Games champion in the halfpipe  having won that title last month  in a competition that  White  skipped.
 White  led a group of four American snowboarders who qualified for the finals of the men's halfpipe at Phoenix Snow Park in Pyeongchang; joining  him  were Ben Ferguson  Chase Josey  and Jake Pates.
 Ferguson  cleaned up  his  second run after a fall in the first. And after a strong final run earned  him  a 90.75   he  finished 4th; Josey was 6th and Pates was 8th.
Shaun White

“Jimmy is a player we have researched extensively since  Kyle  and I joined the 49ers ” General Manager John Lynch said.
“ Kyle  ” in this case  is  San Francisco Coach Kyle Shanahan  — you know  the former offensive coordinator of the Washington Redskins  the son of the head coach here who drafted Kirk Cousins.
Here are the people most directly affected by Monday’s trade: Garoppolo  incumbent 49ers quarterbacks Brian Hoyer (who was released) and C.J. Beathard  and  Shanahan   still pursuing  his  first victory as a head coach as the season heads to the second half. Next on that list: I’d argue it’s Cousins.
In the popular parlor game of “Where Will Kirk End Up?” San Francisco has toggled with the Los Angeles Rams (whom we’ll get to) as the leading destination because of the ties those franchises now have to Cousins’s career. We know the links: When  Shanahan  was the Washington offensive coordinator under  his  father  Mike  the team traded up to select Robert Griffin III in the 2012 draft — but then shrewdly spent a fourth-round pick on Cousins that same draft.

Kyle Shanahan