The bitcoin network is the first decentralized peer-to-peer payment network that is powered by its users with no central authority.

A brief history of Bitcoin and Bitcoin network.

August 18th 2008
A domain name "bitcoin.org" was registered and the word bitcoin first appeared

October 31st 2008
There was a link posted to a cryptography mailing list for a paper written by Satoshi Nakamoto and titled Bitcoin: A Peer-to-Peer Electronic Cash System.

January 2009
Bitcoin software was implemented and released as open-source code by Nakamoto

January 3rd 2009
The bitcoin network was created when Nakamoto mined the first block of the chain, known as the genesis block.

January 12th 2009
Hal Finney received the first bitcoin transaction from Nakomoto

2010
Satoshi Nakamoto disappears and hands the network alert key and control of the code repository over to Gavin Andresen, who later became a lead developer at the Bitcoin Foundation and requested control decentralization.

2011
The price of Bitcoin started at 0.30$

December 17th 2017
Reaching its peak at $19,783.06

Nakamoto's identity remains unknown to this day although there are many theories on who he/they might be.

The size of the network.

Since the creation of bitcoin in 2009 the size of the Bitcoin blockchain has been growing rapidly, reaching approximately 218 gigabytes in size by the middle of May 2019. The average block size on the Bitcoin network is 0.804MB, and there is an average of 1609 transactions per block.