Investing in cryptocurrencies and Initial Coin Offerings ("ICOs") is highly risky and speculative, and this article is not a recommendation by Investopedia or the writer to invest in cryptocurrencies or ICOs. Since each individual's situation is unique, a qualified professional should always be consulted before making any financial decisions. Investopedia makes no representations or warranties as to the accuracy or timeliness of the information contained herein. As of the date this article was written, the author owns no crypto.

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Platforms such as LocalBitcoins will help you to find individuals near you who are willing to exchange bitcoin for cash. Also, LibertyX lists retail outlets across the United States at which you can exchange cash for bitcoin. And WallofCoins, Paxful and BitQuick will direct you to a bank branch near you that will allow you to make a cash deposit and receive bitcoin a few hours later.
At its core, a blockchain is a digital ledger shared among any number of stakeholders with an interest in keeping better track of information and transactions. Everybody gets a copy of the same distributed information. Nothing can be removed. And because a blockchain is a decentralized system, a consensus of stakeholders has to agree before something is added to the ledger.
Transactions placed through a central authority can take up to a few days to settle. If you attempt to deposit a check on Friday evening, for example, you may not actually see funds in your account until Monday morning. Whereas financial institutions operate during business hours, five days a week, blockchain is working 24 hours a day, seven days a week. Transactions can be completed in about ten minutes and can be considered secure after just a few hours. This is particularly useful for cross-border trades, which usually take much longer because of time-zone issues and the fact that all parties must confirm payment processing.
Earning bitcoin in exchange for goods and services is just as feasible an option as mining or investing in the digital currency. There are businesses that allow people to earn bitcoin in exchange for services, including some freelance job listing sites where people are paid in bitcoin, as well as businesses accumulate bitcoin by accepting it as a payment method.
The blockchain sector is something regulators and lawmakers are beginning to look at more closely as well. Earlier this year, the U.S. Securities and Exchange Commission, in uncharacteristically snarky fashion, even created its own cryptocurrency called HowieCoin to show how easily ICOs can hide as frauds. In June, the SEC appointed Valerie Szczepanik as its first “crypto czar,” while members of Congress in July held multiple committee hearings to learn more about how the blockchain can be used in industries such as agriculture.
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.
Third, and maybe most important, blockchain offers the potential to process transactions considerably faster. Whereas banks are often closed on the weekend, and operate during traditional hours, validation of transactions on a blockchain occur 24 hours a day, seven days a week. Some blockchain developers have suggested that their networks can validate transactions in a few seconds, or perhaps instantly. That would be a big improvement over the current wait time for cross-border payments. 
The problem with the hardware wallet is the availability. It takes few weeks or sometimes months to get delivered as the demand is very high. If you are starting now, you can use a mobile wallet to store Bitcoin and later transfer the Bitcoins to a hardware wallet. If you need Bitcoins for daily use and need to store a smaller amount, you can use a mobile wallet such as MyCelium, Jaxx or Coinomi.
Transactions are verified by network nodes through cryptography and recorded in a public distributed ledger called a blockchain. Bitcoin was invented by an unknown person or group of people using the name Satoshi Nakamoto[9] and released as open-source software in 2009.[10] Bitcoins are created as a reward for a process known as mining. They can be exchanged for other currencies,[11] products, and services. Research produced by the University of Cambridge estimates that in 2017, there were 2.9 to 5.8 million unique users using a cryptocurrency wallet, most of them using bitcoin.[12]
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