Bitcoin is a digital asset designed to work in peer-to-peer transactions as a currency.[5][129] Bitcoins have three qualities useful in a currency, according to The Economist in January 2015: they are "hard to earn, limited in supply and easy to verify".[130] Per some researchers, as of 2015 bitcoin functions more as a payment system than as a currency.[31]
With companies like Uber and Airbnb flourishing, the sharing economy is already a proven success. Currently, however, users who want to hail a ride-sharing service have to rely on an intermediary like Uber. By enabling peer-to-peer payments, the blockchain opens the door to direct interaction between parties — a truly decentralized sharing economy results.
Most exchanges accept bank transfer or credit card payments, and some even accept Paypal payments. They’ll also charge you a transaction fee for every trade you make. You can choose from hundreds of crypto exchanges, but the most popular and reputable exchanges are Bitfinex, Bitstamp, Coinbase, and Coinmama. Here’s a list of more popular crypto exchanges.
The safest way to make money with trading is through arbitrage. In short, this means that you see an opportunity to buy an asset in one place for a certain price and sell it immediately at another place for a higher price. It is important that you know you can sell the asset immediately at a certain price. If this does not hold, then we are talking of speculation - or gambling if you prefer.

In Bitcoin’s early days, and we mean really early, the practical way to obtain bitcoins was by mining. Mining is the process by which newly minted bitcoins are released. Back then, the difficulty of the network was low enough that regular computers’ processing units (CPUs) and graphic processing units (GPUs) could mine bitcoins at very little cost.
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.

Evolving beyond the complex world of cryptocurrencies, blockchain applications are now showing enormous potential for many key industries. Industry analyst, Gartner, predicts that blockchain's business value-add will grow to US$176 billion by 2025.1 Although in its nascent stages and not without challenges, the technology is poised to revolutionize how consumers and businesses interact with data. Blockchain has the potential to redefine how we manage supply chains, maintain transactions and exchange assets.
Sure. As discussed, the easiest way to acquire Bitcoin is to buy it on an exchange like Alternately, you can always leverage the "pickaxe strategy". This is based on the old saw that during the 1849 California gold rush, the smart investment was not to pan for gold, but rather to make the pickaxes used for mining. Or, to put it in modern terms, invest in the companies that manufacture those pickaxes. In a crypto context, the pickaxe equivalent would be a company that manufactures equpiment used for Bitcoin mining. You can look into companies that make ASICs miners or GPU miners. 
Block-chain technology is broader than finance. It can be applied to any multi-step transaction where traceability and visibility is required. Supply chain is a notable use case where Blockchain can be leveraged to manage and sign contracts and audit product provenance. It could also be leveraged for votation platforms, titles and deed management - amongst myriad other uses. As the digital and physical worlds converge, the practical applications of Blockchain will only grow.
Too much time and effort is currently wasted on identity verification. Using the decentralization of Blockchains, the verification of online identity will be much quicker. Online identity data in a central location will vanish with the use of the Blockchain smart contracts. Computer hackers will no longer have centralized points of vulnerability to attack. Data storage is tamper-proof and incorruptible when backed by Blockchain. All over the world, the Blockchain is leading to big improvements in the verification of identity.
With tips, the nice thing is that you don't necessarily need to have a shop. A blog for instance or any other website is sufficient. You can display the QR-code or just your Bitcoin address at the bottom of your page or wherever it seems convenient and let people decide how much they want to tip you. You can also view how this looks like in the footer of this German blog bitcoins21.
In Bitcoin terms, simultaneous answers occur frequently, but at the end of the day there can only be one winning answer. When multiple simultaneous answers are presented that are equal to or less than the target number, the Bitcoin network will decide by a simple majority--51%--which miner to honor. Typically, it is the miner who has done the most work, i.e. verifies the most transactions. The losing block then becomes an "orphan block." 
Google Trends structures the chart to represent a relative search interest to the highest points in the chart. A value of 100 is the peak popularity for the term “Bitcoin” and a value of 50 means it was half as popular at that time. A score of 0 indicates that the term was less than 1% as popular as the peak. It’s amazing how the searches relating to Bitcoin have spiked in the past few years.
To be accepted by the rest of the network, a new block must contain a proof-of-work (PoW).[67] The system used is based on Adam Back's 1997 anti-spam scheme, Hashcash.[5][83] The PoW requires miners to find a number called a nonce, such that when the block content is hashed along with the nonce, the result is numerically smaller than the network's difficulty target.[3]:ch. 8 This proof is easy for any node in the network to verify, but extremely time-consuming to generate, as for a secure cryptographic hash, miners must try many different nonce values (usually the sequence of tested values is the ascending natural numbers: 0, 1, 2, 3, ...[3]:ch. 8) before meeting the difficulty target.
One of the solutions offered by Deloitte is the inclusion of a QR-code in a receipt. The QR-code is set to contain all the relevant information regarding the purchase: item, serial number, date of purchase and so on. With it, the QR-code also holds instructions on how to find a ‘warranty bot’ on Facebook Messenger. The user can then send a picture of the receipt to that bot, the engine unwraps the QR-code and stores all the product information on the Blockchain.
Bitcoin’s first mover advantage, popularity, and network effect have cemented it as the most popular cryptocurrency with the largest market cap. Rivals like Litecoin may have numerous technical advantages over Bitcoin’s algorithm (see more about that here), but they only hold a fraction of Bitcoin’s market cap and their dwindling communities largely consist of loyalists, speculators, and antagonistic anti-Bitcoin buyers.
Nakamoto is estimated to have mined one million bitcoins[27] before disappearing in 2010, when he handed the network alert key and control of the code repository over to Gavin Andresen. Andresen later became lead developer at the Bitcoin Foundation.[28][29] Andresen then sought to decentralize control. This left opportunity for controversy to develop over the future development path of bitcoin.[30][29]