* Adding new content to index.md
Added mention of blockchain technologies in first paragraph.
Added link to coinmarketcap, and changed sentence about cryptocurrencies fractions, which was unclear IMO.
Retouched last sentence including mention to decentralized exchanges.
* Translation of proposal for index.md
In case pull-request #29673 is accepted, this is its Spanish translation
Pull-request URL: https://github.com/freeCodeCamp/freeCodeCamp/pull/29673
* Add and delete the text
"digital/virtual" ,"Bitcoin is currently the most popular and valuable one.The sole purpose to bring up the concept of cryptocurrency was to remove the intervention of middlemen third parties in order to make te transactions more swift and secure , with the anonymity maintained for the all the users operating through their respective systems called 'nodes' on a network." " One needs to lend their computational power to arrive on a consensus and hence thereby validating the transaction on the blockchain network"
* fix: spelling
* Some additional facts on crypto-space as of 2018
Added some relevant facts on crypto-currency space and cited links.
Added one line that is my personal opinion, but nevertheless relevant.
* fix: formatting
Added sentence "In order to control the supply of bitcoin, mining is deliberately designed to be difficult and resource-intensive." Also deleted incorrect apostrophe in "Computers".
Nadeem Bhati
rejuls
Justin Thomas
Giovanni G
CodingHero97
edu san
Alex Yu
EncinoMan01
AAKANKSHACHOUHAN
Subhasis Banik
Alvin Tan
Paul
Dustin Christlieb
DavidNachman
dillon
Micky
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ispaghet
tess
DiggyShants
Benzene88
Mrugesh Mohapatra