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Introduction_1
There’s a new technology that has the power to revolutionize how you, businesses, and the world interact!
You’ve probably heard of it: it’s called Blockchain!
But what is it? How does it work? How does it affect you?
Hearing the word “blockchain” is comparable to hearing the word “internet” in the early 90s.
It seemed elusive, like something that wasn’t going to impact your daily life.
But here we are, more than 20 years later. Think about how the Internet has transformed businesses, commerce, communication, even music and video.
And that’s not even touching on how the Internet has affected you.
We all carry the Internet in our pocket.
We can transfer money at the touch of a button, check the weather, get directions, and even have food delivered to our door.
The next technology to have that kind of impact isn’t some of the buzzwords you hear.
It’s not big data. It’s not artificial intelligence. It’s not even social media.
It’s BLOCKCHAIN!
Now, let’s discuss the vast promise blockchain has for every business, every society, and for everyone listening today.
And let’s begin with an example we are all familiar with.
When you attach a file, a Word document, an Excel sheet, a PDF to an email, you aren’t sending an original.
You are actually sending the recipient a copy, and that’s a great way to move information around.
But it’s not so great when it comes to things like money, stocks and bonds, music, loyalty points, intellectual property, tickets to a game or concert.
Then, sending a copy is suddenly a very bad idea.
Let’s look at an example.
If I send you tickets to a concert, it’s important that I don’t send you a copy.
You now own the original asset and I can no longer use or sell those tickets.
Similarly, if I send you $100, it’s important that I still don’t own the $100, or have the ability to send it to anyone else.
Both of these examples illustrate a double spend problem, and those can be eliminated with blockchain.
So now, in this exciting time in history, every kind of asset, from tickets, to money, to music, can be stored, moved, exchanged, and transacted without an intermediary.
People everywhere can transact peer-to-peer and trust each other by using collaboration and cryptography.
How did we get here, to this place of trust and collaboration?
It began when Satoshi Nakamoto, whose true identity is still unknown, released a white paper in 2008, introducing a purely peer-to-peer version of electronic cash known as Bitcoin.
It is here that blockchain technology made its debut.
Even today people believe Bitcoin and blockchain are one and the same.
They are not!
Bitcoin, another alternative currency, utilize blockchain technology.
While an important one, Bitcoin is only one use case for blockchain.
Blockchain allows people to exchange assets and perform transactions without a third party.
Imagine a world where you don’t need intermediaries.
While traditionally we have needed central authorities to trust one another and fulfill contracts,
blockchain makes it possible to have our peers guarantee that for us. But how?
Assets, like we’ve discussed, are no longer stored in a central place, but distributed across a global ledger, using the highest level of cryptography.
When a transaction is conducted, it’s posted across tens of thousands of computers around the globe.
These transactions are recorded as blocks.
Let’s imagine a sheet of paper that has 25 lines.
When a sheet is filled up with 25 transactions, the block is validated via group consensus.
Once the page has been validated, it is added to a stack of previously validated sheets.
Each sheet on the stack can be assumed to be trustworthy because, once a sheet is validated, it can’t be changed.
Because at this point, all the sheets are linked together.
And to link our sheets together, we embed information from the previous sheet of paper into the new, recently validated sheet.
In blockchain, our sheet of paper is equal to a block.
The act of embedding a previous block of information into the current block of information is called chaining, hence, the name blockchain.
In order to compromise or hack a blockchain network, someone would have to gain control of the majority of computers in that network.
This is extremely difficult to do.
There is no longer a single point of failure, and this is what makes blockchain infinitely more secure than what we have today.
Blockchain isn’t just for assets, though. It extends to contracts.
These are called Smart Contracts.
And what are they exactly? What they sound like.
A smart contract self-executes and handles enforcement, the management, and performance of agreements between people.
Examples of smart contracts include insurance policies, copyrighted content, escrow and lending, wills, and trusts.
Smart contracts will revolutionize how we do business.
There are so many possibilities with blockchain; not just in the now, but with things we haven’t begun to think about yet.

What’s Blockchain ?

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A blockchain is a distributed ledger technology that forms a “chain of blocks.” Each block includes information and data that are bundled together and verified. These blocks are then validated and strung onto the chain of transactions and information in previous blocks. These blocks of transactions are permanently recorded in the distributed ledger that is the blockchain.

Store in blockchain

A block on a blockchain can be thought of much like a page in a notebook. Data is stored on a block, just like data is written on a page of a notebook.
Each block is chained or tied to the previous block by embedding the block with information from the previous block.If the data is tampered with anywhere in the chain, the links will break in a very obvious way

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Blockchain Components
The blockchain is built of several different types of components, each with a specific role to play within the blockchain’s operation:
Ledger: A distributed, immutable historical record.
Peer Network: Stores, updates, and maintains the ledger.
Membership Services: User authentication, authorization, and identity management.
Smart Contract: Program that runs on the blockchain.
Wallet: Stores users’ credentials.
Events: Notifications of updates and actions on the blockchain.
Systems Management: Component creation, modification, and monitoring.
Systems Integration: Integration of blockchain with external systems.
 
 

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