Blockchain: The Invisible Technology That's Changing the World

Blockchain isn't a household buzzword, like the cloud or the Internet of Things. It's not an in-your-face innovation you can see and touch as easily as a smartphone or a package from Amazon. But in a world where anyone can edit a Wikipedia entry, blockchain is the answer to a question we've been asking since the dawn of the internet age: How can we collectively trust what happens online?

Every year we run more of our lives—more core functions of our governments, economies, and societies—on the internet. We do our banking online. We shop online. We log into apps and services that make up our digital selves and send information back and forth. Think of blockchain as a historical fabric underneath recording everything that happens—every digital transaction; exchange of value, goods and services; or private data—exactly as it occurs. Then the chain stitches that data into encrypted blocks that can never be modified and scatters the pieces across a worldwide network of distributed computers or "nodes."

Think about a blockchain as a distributed database that maintains a shared list of records. These records are called blocks, and each encrypted block of code contains the history of every block that came before it with timestamped transaction data down to the second. In effect, you know, chaining those blocks together. Hence blockchain.

A blockchain is made up of two primary components: a decentralized network facilitating and verifying transactions, and the immutable ledger that network maintains. Everyone in the network can see this shared transaction ledger, but there is no single point of failure from which records or digital assets can be hacked or corrupted. Because of that decentralized trust, there's also no one organization controlling that data, be it a big bank or a tech giant like Facebook or Google. No third-parties serving as the gatekeepers of the internet. The power of blockchain's distributed ledger technology has applications across every kind of digital record and transaction, and we're already beginning to see major industries leaning into the shift.

First up are the big banks and tech giants. Big business will always drive innovation, and the rise of blockchain-based smart contracts (read on for a deeper explanation) turns blockchain into a middleman to execute all manner of complex business deals, legal agreements, and automated exchanges of data. Companies such as Microsoft and IBM are using their cloud infrastructure to build custom blockchains for customers and experiment with their own use cases, like building a worldwide food safety network of manufacturers and retailers. On the academic side, researchers are exploring blockchain applications for projects ranging from digital identity to medical and insurance records.

At the same time, dozens of startups are using the technology for everything from global payments to music sharing, from tracking diamond sales to the legal marijuana industry. That's why blockchain's potential is so vast: When it comes to digital assets and transactions, you can put absolutely anything on a blockchain. A host of economic, legal, regulatory, and technological hurdles must be scaled before we see widespread adoption of blockchain technology, but first movers are making incredible strides. Within the next handful of years, large swaths of your digital life may begin to run atop a blockchain foundation—and you may not even realize it.

Beyond Bitcoin

Blockchain is the data structure that allows Bitcoin (BTC) and other up-and-coming cryptocurrencies such as Ether (ETH) to thrive through a combination of decentralized encryption, anonymity, immutability, and global scale. It's the not-so-secret weapon behind the cryptocurrency's rise, and to explain how blockchain came to be, we have to begin briefly with the legacy of Bitcoin.

On Oct. 31, 2008, Bitcoin founder and still-mysterious Satoshi Nakamoto (a pseudonym) published his famous white paper introducing the concept of a peer-to-peer (P2P) electronic cash system he called Bitcoin. The Bitcoin blockchain launched a few months later on Jan. 3, 2009.

For Jeff Garzik, it started the way many a buzzy idea in the tech community has over the years: with a post on "news for nerds" and OG tech aggregator Slashdot.org. Garzik is the CEO and cofounder of enterprise blockchain startup Bloq, but has spent years as a Bitcoin core developer. He was also recently elected to the Board of Directors of The Linux Foundation (as the first member with a blockchain and cryptocurrency background).

In July 2010, Garzik was working on Linux at enterprise software company Red Hat when what he calls "The Great Slashdotting" occurred. One viral postintroduced programmers, investors, and tech nerd-dom at large to the concept of Bitcoin, and by extension, to blockchain. Garzik had always been fascinated with the goal of making seamless digital payments work on a global scale and across borders. When he realized how Bitcoin's underlying technology worked, he said it "knocked him on his bum."

"I had already thought to myself about how someone might create a decentralized version of PayPal. When Elon [Musk] and Peter Thiel and the other founders created PayPal, they had this vision of a global ledger that could easily and cheaply add entries between users like a database entry. That vision met reality with banking laws and cross-border friction, with legal hurdles and regulations not only in the U.S. but around the world. It made that kind of decentralized global currency impossible, or so we thought.

"Bitcoin turned all of that on its head," Garzik went on. "From an engineering perspective, the proof of work was this very elegant way to elect a leader, the block creator, in this decentralized and potentially adversarial system. Bitcoin layered on top of that engineering a set of economic and game-theory incentives that paid you in the script of the system itself, creating this virtuous cycle where it's in your best economic interest to to follow the consensus rules and create the longest, strongest chain possible. I didn't realize until that post on that day how elegantly it could be done."

It's important to understand why Bitcoin and blockchain are not the same thing. In Garzik's TEDx Talk (above), he described Bitcoin as "an organism." It has layers, like other software. On top of the public Bitcoin blockchain sits billions of dollars worth of cryptocurrency, but beneath that is a ledger just like any other blockchain. That decentralized ledger technology, and its myriad potential uses for securely transferring data and digital assets over the internet, is the subject of this feature. For a deeper dive into the nuances of cryptocurrencies like Bitcoin and Ethereum and the complex political dynamics at work in those communities, check out our explainer on why blockchains fork.

Garzik said Bitcoin was just the first demo application of what blockchain can do. In this case, it built a monetary revolution on the back of an all-seeing ledger, one that's everywhere and nowhere at once, and gave the cryptocurrency its power.

Blockchain for Beginners - coming soon...

Source: pcmag.com | by ROB MARVIN 
Read more here: Blockchain: The Invisible Technology That's Changing the World.

 
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