Examples 

"Bitcoins can be exchanged between any two computers, provided each computer has bitcoin software and a wallet file. Some websites maintain wallet files (and bitcoin software) as a service to their users, allowing users to send and receive bitcoin even if they do not own a personal computer. No intermediate financial institution or government is required to verify transactions or transfer funds."

The above is not acceptable mainly because bitcoins are not solely exchanged between computers. That is not how the system operates entirely and it's in fact and understatement to the networking technology. A bitcoin transaction is simply signing the bitcoin address of another and transferring the coins. You can do that with any device. The website statement is misleading and implies people are trading bitcoins out of a library. That is not why these websites exist and you will need a citation for that claim. Even then, that's not where that claim belongs. The lead is for summarizing the article. Not adding more content. 

Also during this edit, https://en.wikipedia.org/w/index.php?title=Bitcoin&diff;=548172114&oldid;=548104412, you completely butchered the description on how the bitcoin ledger system operates. You talk about how transactions are confirmed but you totally deleted the big picture: Bitcoin is a giant transaction log based on cryptography. You are not literally sending coins to each other by reassigning balances through digital signatures that are confirmed as following the rules by the network. You are making things very vague and not easier to understand.

And again, you are making things inaccurate. If you continue to add unsourced and inaccurate material, I will be taking this to dispute resolution.