Bitcoin is a virtual or digital currency also known as a cryptocurrency created by the mysterious (and unknown) Satoshi Nakamoto. Bitcoin is like other currencies: it can be used to purchase items locally and electronically. However, bitcoin differs from conventional money in that it is decentralized and fully independent. No institution controls the Bitcoin Network and it is not tied to a country like the US Dollar. The entire network is maintained by individuals and organizations referred to as Bitcoin Miners. Bitcoin miners process and verify bitcoin transactions through a mathematical algorithm based on the cryptographic (hence the name cryptocurrency) hash algorithm SHA256.
Bitcoin is Decentralized
No central authority controls Bitcoin or its network of transactions. A community of Bitcoin miners make up the network, processing the transactions. If any changes are made to Bitcoin by a developer or developers using GitHub, a 51% majority of the miners hashing power must agree upon it. This insures that, in theory, no individual can steal your bitcoins or print (create) more.
Also read: What is an Altcoin?
How Can One Change Bitcoin and Bitcoin's code?
Everyone can contribute to and edit the Bitcoin source code since the Bitcoin protocol is open source. The Bitcoin protocol is viewable for all making it easier to spot weaknesses and provide suggestions for improvement. However, if a developer edit the Bitcoin code, that edit has to be accepted by more than 51% or more of the Bitcoin miners that runs the Bitcoin network. Bitcoin can be seen as a democratic currency where the majority always decide what will happen next with the Bitcoin source code.
Bitcoin Wallet and Transactions
Though each Bitcoin transaction is recorded in a public log called the block chain, names of buyers and sellers are never revealed – only their Bitcoin wallet addresses. Each wallet address is unique and can't be linked to anyone unless the creator of that specific bitcoin address reveals himself.
1Lst6Ro8r5C7QrxAuoZg1LJAuQtP3W9uV2 is an example of a unique bitcoin address used for receiving and sending bitcoins.
To send, receive and create Bitcoin addresses you must have a Bitcoin wallet (Learn how to chose the correct Bitcoin wallet here). A Bitcoin wallet is a software that's essentially your bank account for bitcoins. Your wallet can hold as many bitcoins and Bitcoin addresses you'd like, and you can own as many wallets you want.
While bitcoin can be anonymous, that doesn't mean it is. If you purchase your bitcoins on a Bitcoin trading platform or exchange that has your information, the bitcoins you buy can be tied back to you.
Bitcoin is Transparent
Every Bitcoin transaction that has ever happened is stored in detail in the public ledger known as the block chain. By using the block chain, anyone can see how many bitcoins are stored on a particular address, and they can see the deposits and withdrawals to that address, but they will be unable to know who owns the address.
When you send bitcoins to a Bitcoin address, you can not reverse the transaction. Unlike credit cards where transaction can be disputed or reversed, bitcoins are nonrefundable. Bitcoin can not be replaced either. If your wallet is stored on your hard drive and not in a “cloud”, you could lose your bitcoins if you are hacked, get a virus or if your computer dies. These lost bitcoins can never be retrieved. That's why it is so important to take regular backups and implement measures for Bitcoin wallet security.
Furthermore, merchants cannot initiate charges on you as they can and do with credit cards. Each transaction must be initiated by the wallet holder, further underlining the advantages of the Bitcoin system.
Proponents of Bitcoin tout its formidable security, and with good reason. In theory, unless 51% of the system is controlled by one party, Bitcoin is virtually unhackable. For instance, in order for someone to change a transaction or double spend a Bitcoin, they would have to obtain majority control of the system and modify every miner in this majority. When there is a disagreement in the block chain, the system overrides the minority with the data agreed upon by the majority.
Bitcoins are created through a process known as mining. Mining is the term used by those who contribute to processing transactions. Miners process and secure the network using specialized hardware that “mine” for new bitcoins. As “payment” for their contribution, they are awarded new bitcoins. This is how new bitcoins are generated.
New coins are created at a fixed and decreasing rate that is predictable. The number of coins created each year is halved over time until 21 million bitcoins are in circulation. At this point, bitcoin miners will be rewarded by transaction fees.
When a miner has successfully created a new hash, the block is sealed off and added to the block chain. 25 bitcoins are awarded to the miner who discovered the new hash. The number of bitcoins rewarded per block is cut in half every four years. Blocks are solved an approximate rate of 6 per hour.
Why use Bitcoins?
Bitcoins are attractive to a large number of people of an equally large number of reasons. Bitcoins can be anonymous, near instantaneous and offer a level of control over your money like no other traditional currency. There are no banks that can take away your money, and Bitcoins are deflationary in nature, while e.g. USD is inflationary where your money depreciate over time. Bitcoins are also speculative in nature drawing the attention of investors.
Merchants are drawn to Bitcoin because of the low fees. Merchants typically pay 2-3% fees from credit card processors, whereas many types of transactions are free with Bitcoin. Transactions are free if several conditions are met. Any transactions that don't meet thee requirements are charged 0.1mBTC (0.0001 BTC) per 1,000 bytes. Typical transactions are 500 bytes but do not meet the priority requirement and thus are charged a 0.1mBTC fee regardless how many coins are transferred. You can view the live Bitcoin price here.
How to Obtain Bitcoins
Bitcoins can also be obtained by becoming a part of the Bitcoin network and start mining for bitcoins. Before the days of ASIC miners, individuals could set up their computers to mine and earn bitcoins easily. Those days are long gone due to the difficulty to mine Bitcoin, the difficulty level of Bitcoin, has risen enormous making it harder and harder to earn bitcoins with the same equipment. Becoming a miner and seeing positive ROI would mean a substantial investment and is now left to the big companies and wealthy investors. For most individuals, purchasing your Bitcoin through a Bitcoin Exchange is the best option. You can also find ways to earn free bitcoins.
The Best "What is Bitcoin" Videos
We have picked the three best "What is Bitcoin" videos that you should watch to learn more about Bitcoin. You can view them below.
Simple Bitcoin Explanations
More Thorough and Detailed Bitcoin Explanation
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