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]

Up to this day, Bitcoin uninterruptedly works as money one person pays another person for goods and services. Once Bitcoin is exchanged, the record of the transaction is publicly recorded onto a ledger known as the blockchain, which other Bitcoin users, known as miners, verify by putting those transactions into a block and adding it to the blockchain after Proof of Work (PoW).
Well, your data is currently held in a centralized database (just like at Equifax). A centralized database is much easier to hack into because it uses one main server. In this case, all the hacker must do to steal the data, is hack the main server. In a blockchain, there is no main server — there is no central point for a hacker to attack! Here’s a great advantage of blockchain explained.
Blockchain is a Distributed Ledger Technology (DLT) that was invented to support the Bitcoin cryptocurrency. Bitcoin was motivated by an extreme rejection of government-guaranteed money and bank-controlled payments. The developer of Bitcoin, Satoshi Nakamoto envisioned people spending money without friction, intermediaries, regulation or the need to know or trust other parties.
COINADDER :: This site has a similar concept to earn bitcoins as the one listed above. You can watch videos and websites to get your first couple of Satoshis. I haven't tested this one but generally the payouts seem smaller. However, before you start to earn bictoins more seriously by watching ads, you should not just calculate the reward per view, but also how long a video view takes you. At the end of the day you want to maximize the bitcoins you earn per hour.

You also have private blockchains. These are often used for more niche purposes like a business managing data or interacting with its customers. For example, Northern Trust, the financial services firm created one with IBM that it’s been testing for more than a year to store data such as biometric information and other records. In June, it also won a patent for storing meeting notes on the blockchain.


The private key (comparable to an ATM PIN) is meant to be a guarded secret, and only used to authorize Bitcoin transmissions. Thus, it’s the “private key” that is kept in a Bitcoin wallet. Some safeguards for a Bitcoin wallet include: encrypting the wallet with a strong password and choosing the cold storage option, i.e. storing it offline. In the case of Coinbase, they offer a secure "multisig vault" to host your keys, which you can sign up for. 
Bitcoin mining is the process by which new Bitcoins are generated. When you perfom mining, your computer adds new Bitcoin transactions to the block chain (a public ledger where all Bitcoin transactions are stored) and searches for new blocks. A block is a file that has the most recent Bitcoin transactions recorded in it. When your computer discovers a new block, you receive a certain number of Bitcoins. Currently a block contains BTC 25. This number changes throughout time and gets smaller by the factor 0.5 every four years.
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.
Elections and polls could be greatly improved with smart contracts. There are various apps already in existence, such as Blockchain Voting Machine, Follow My Vote and TIVI. All of them are promising to eliminate fraud, while providing complete transparency to the results and keeping the votes anonymous. However, there is still a long road ahead before decentralized voting is implemented widely.
A blockchain carries no transaction cost. (An infrastructure cost yes, but no transaction cost.) The blockchain is a simple yet ingenious way of passing information from A to B in a fully automated and safe manner. One party to a transaction initiates the process by creating a block. This block is verified by thousands, perhaps millions of computers distributed around the net. The verified block is added to a chain, which is stored across the net, creating not just a unique record, but a unique record with a unique history. Falsifying a single record would mean falsifying the entire chain in millions of instances. That is virtually impossible. Bitcoin uses this model for monetary transactions, but it can be deployed in many others ways.
An early example, OpenBazaar uses the blockchain to create a peer-to-peer eBay. Download the app onto your computing device, and you can transact with OpenBazzar vendors without paying transaction fees. The “no rules” ethos of the protocol means that personal reputation will be even more important to business interactions than it currently is on eBay.
Researchers have pointed out at a "trend towards centralization". Although bitcoin can be sent directly from user to user, in practice intermediaries are widely used.[31]:220–222 Bitcoin miners join large mining pools to minimize the variance of their income.[31]:215, 219–222[111]:3[112] Because transactions on the network are confirmed by miners, decentralization of the network requires that no single miner or mining pool obtains 51% of the hashing power, which would allow them to double-spend coins, prevent certain transactions from being verified and prevent other miners from earning income.[113] As of 2013 just six mining pools controlled 75% of overall bitcoin hashing power.[113] In 2014 mining pool Ghash.io obtained 51% hashing power which raised significant controversies about the safety of the network. The pool has voluntarily capped their hashing power at 39.99% and requested other pools to act responsibly for the benefit of the whole network.[114]

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Transactions are defined using a Forth-like scripting language.[3]:ch. 5 Transactions consist of one or more inputs and one or more outputs. When a user sends bitcoins, the user designates each address and the amount of bitcoin being sent to that address in an output. To prevent double spending, each input must refer to a previous unspent output in the blockchain.[69] The use of multiple inputs corresponds to the use of multiple coins in a cash transaction. Since transactions can have multiple outputs, users can send bitcoins to multiple recipients in one transaction. As in a cash transaction, the sum of inputs (coins used to pay) can exceed the intended sum of payments. In such a case, an additional output is used, returning the change back to the payer.[69] Any input satoshis not accounted for in the transaction outputs become the transaction fee.[69]
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