Blockchain can also, depending on the circumstance, be very energy dependent, and therefore costly. When transactions are being verified (which we're going to talk about in the next section), it's possible that a lot of electricity can be used. This is the case in point with bitcoin, which is why so few cryptocurrency miners actually find that validating transactions on bitcoin's blockchain is worthwhile (and profitable). 
One of the greatest aspects of blockchain technology is the ability for a developer or business to customize it. This means a blockchain can be completely open to the public and allow anyone to join, or it can be totally private, with only certain folks allowed access to the data, or allowed to send and receive payments. Bitcoin is an example of an open-source public blockchain that allows anyone to join, whereas a private blockchain would be perfect for a corporate customer.
Bloomberg reported that the largest 17 crypto merchant-processing services handled $69 million in June 2018, down from $411 million in September 2017. Bitcoin is "not actually usable" for retail transactions because of high costs and the inability to process chargebacks, according to Nicholas Weaver, a researcher quoted by Bloomberg. High price volatility and transaction fees make paying for small retail purchases with bitcoin impractical, according to economist Kim Grauer. However, bitcoin continues to be used for large-item purchases on sites such as Overstock.com, and for cross-border payments to freelancers and other vendors.[136]
Real money is gold, silver, precious metals and gemstones, natural resources. Paper currency and coins use to be backed by gold or one of these other material commodities and was payable upon demand to any the person who had the dollar bill or coin currency, it was once written right on the Dollar bills and it was legal tender backed by the governments’ gold reserve! But corruption on an unprecedented scale took over and the general public was tricked into accepting a false standard of the economy where people blindly trusted another system which really didn’t benefit them. Just look at all the financial and economic chaos around you that has effective your lives over many decades and the political instability growing every day!
Bitcoin has both advantages and disadvantages. Advantages include the ability to choose your own fees, easily accept payment from people who do not have credit cards, and send payment without tying your personal information to the transaction.[32] Disadvantages include that it is a very new form of currency, acceptance of it is still limited, and the anonymity of transactions means you do not know with whom you're dealing.[33]
Though transaction fees are optional, miners can choose which transactions to process and prioritize those that pay higher fees.[69] Miners may choose transactions based on the fee paid relative to their storage size, not the absolute amount of money paid as a fee. These fees are generally measured in satoshis per byte (sat/b). The size of transactions is dependent on the number of inputs used to create the transaction, and the number of outputs.[3]:ch. 8
Now to get the blockchain explained in simple words, it requires no central server to store blockchain data, which means it is not centralized. This is what makes the blockchain so powerful. Instead of the server being stored in one place, it is stored on the blockchain and is powered by many different computers/nodes. This means there is no third party to trust and pay a fee to.
Information held on a blockchain exists as a shared — and continually reconciled — database. This is a way of using the network that has obvious benefits. The blockchain database isn’t stored in any single location, meaning the records it keeps are truly public and easily verifiable. No centralized version of this information exists for a hacker to corrupt. Hosted by millions of computers simultaneously, its data is accessible to anyone on the internet.
The crowdsourcing of predictions on event probability is proven to have a high degree of accuracy. Averaging opinions cancels out the unexamined biases that distort judgment. Prediction markets that payout according to event outcomes are already active. Blockchains are a “wisdom of the crowd” technology that will no doubt find other applications in the years to come.
What miners are doing with those huge computers and dozens of cooling fans is guessing at the target hash. Miners make these guesses by randomly generating as many "nonces" as possible, as fast as possible. A nonce is short for "number only used once," and the nonce is the key to generating these 64-bit hexadecimal numbers I keep talking about. In Bitcoin mining, a nonce is 32 bits in size--much smaller than the hash, which is 256 bits. The first miner whose nonce generates a hash that is less than or equal to the target hash is awarded credit for completing that block, and is awarded the spoils of 12.5 BTC.
In the proof of work system, computers must “prove” that they have done “work” by solving a complex computational math problem. If a computer solves one of these problems, they become eligible to add a block to the blockchain. But the process of adding blocks to the blockchain, what the cryptocurrency world calls “mining,” is not easy. In fact, according to the blockchain news site BlockExplorer, the odds of solving one of these problems on the Bitcoin network were about 1 in 5.8 trillion in February 2019. To solve complex math problems at those odds, computers must run programs that cost them significant amounts of power and energy (read: money).
“The traditional way of sharing documents with collaboration is to send a Microsoft Word document to another recipient, and ask them to make revisions to it. The problem with that scenario is that you need to wait until receiving a return copy before you can see or make other changes because you are locked out of editing it until the other person is done with it. That’s how databases work today. Two owners can’t be messing with the same record at once.That’s how banks maintain money balances and transfers; they briefly lock access (or decrease the balance) while they make a transfer, then update the other side, then re-open access (or update again).With Google Docs (or Google Sheets), both parties have access to the same document at the same time, and the single version of that document is always visible to both of them. It is like a shared ledger, but it is a shared document. The distributed part comes into play when sharing involves a number of people.
For example, Ethereum (CCY: ETH-USD), which has a nearly $116 billion market cap and is the second-largest cryptocurrency behind bitcoin, currently has 200 organizations testing a version of its blockchain technology. Yes, traditional banks are testing out Ethereum's blockchain, but so are companies in the technology and energy industries. Integrated oil and gas giant BP (NYSE:BP) envisions using a version of Ethereum's blockchain to aid it with energy futures trading. If these transactions were to settle faster, BP could presumably improve its margin. 
Proof of Work is a system that requires some work from the service requester, usually meaning processing time by a computer. Producing a proof of work is a random process with low probability, so normally a lot of trial and error is required for a valid proof of work to be generated. When it comes to Bitcoins, hash is what serves as a proof of work.
Get a free online Bitcoin wallet from Coinbase. If you're not sure what a Bitcoin wallet is, check out my What is Bitcoin section. There are also many other providers apart from Coinbase. When you sign up with LocalBitcoins you will also get a free bitcoin wallet with a broad range of functions. Find out which works best for you. And remember, no wallet is absolutely safe, so be careful with your money. Especially make sure you keep your Bitcoins stored safely in at least 2 or 3 different places.

In the blockchain, bitcoins are registered to bitcoin addresses. Creating a bitcoin address requires nothing more than picking a random valid private key and computing the corresponding bitcoin address. This computation can be done in a split second. But the reverse, computing the private key of a given bitcoin address, is mathematically unfeasible. Users can tell others or make public a bitcoin address without compromising its corresponding private key. Moreover, the number of valid private keys is so vast that it is extremely unlikely someone will compute a key-pair that is already in use and has funds. The vast number of valid private keys makes it unfeasible that brute force could be used to compromise a private key. To be able to spend their bitcoins, the owner must know the corresponding private key and digitally sign the transaction. The network verifies the signature using the public key.[3]:ch. 5
×