What Is Blockchain Technology
Traditionally, there have been middlemen who have been controlling the data. For instance, Facebook is the middleman between users and advertisers. Banks are middlemen between borrowers and lenders.
The issue here is that the data is controlled by a central authority – Facebook and banks. They, therefore, control the prices and also technically own the data. In this scenario, all the power lies with a middleman and users have to trust them to remain ethical and continue to think about user interest. Blockchain was invented to make the data decentralized and trust minimized with any centralized party.
In order to understand it better, let us talk about torrents. In torrents, no file is owned by a single person. It is a kind of peer-to-peer architecture where multiple copies of the file are present at multiple workstations/users. Therefore, no single person controls that file. This kind of architecture is highly scalable and fault-tolerant since there is no single point of failure.
Blockchain essentially borrows the same idea: what if databases could be decentralized. This solves a lot of issues:
- You can directly connect to a borrower without a middleman like a bank. You will get more profits.
- You can connect directly to advertisers to tell them the kind of ads that you like, without going through Facebook.
There are several applications and use cases of Blockchain for which we’ve written an in-depth article:
Learn Blockchain And Become A Blockchain Developer
Looking for blockchain online training? edX offers numerous blockchain tutorials and classes for people of different skill levels. If you are just starting to learn about it, The University of Berkeley offers a program called Blockchain fundamentals where you will learn core topics in cryptocurrency, including Bitcoin, and blockchain technology. You will synthesize your own blockchain solutions, gain an in-depth understanding of the specific mechanics of Bitcoin, bitcoins’s real-life applications and learn how to attack and destroy Bitcoin, Ethereum, smart contracts and Dapps, and alternatives to Bitcoinâs Proof-of-Work consensus algorithm, and much more.
For students with advanced technical backgrounds, the Linux course offers the opportunity to work with enterprise-ready Hyperledger blockchain frameworks. Set up Hyperledger Sawtooth and Hyperledger Fabric and develop applications. The 8-week online course is free and open for anyone to enroll. Start your path to become a blockchain developer today.
Explore additional courses in network security, data management, cybersecurity and more on edX. Many courses are self-paced so you can enroll and start learning today.
Whether you are looking to accelerate your career, earn a degree, or learn something for personal reasons, edX has the courses for you.
Feature #: Move Semantics
One of the most interesting aspects of C++ is move semantics. Move semantics provides a way for the contents to be moved between objects rather than be copied outright. Lets check out the differences between copy semantics and move semantics. .
- a = b
So what is happening here? The value of b goes into a and b remains unchanged at the end of the whole thing.
Now, consider this.
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Learn The Basics Of Blockchain
This Blockchain basics program will help you cut through the buzz surrounding blockchain, Bitcoin, and cryptocurrency. Learn blockchain and its core platforms while mastering important tools like Ganache, Truffle, MetaMask, and Geth. You will also be able to create apps with Ethereum and set up a small private network using Hyperledger Composer.
- 6 HoursOf self-paced video lessons
- Completion Certificateawarded on course completion
- 90 Days of AccessTo your Free Course
- Enroll and win rewards
What Is The Professional Certificate Program In Blockchain
In association with IIT Kanpur, this blockchain certification program gives deep insights into Bitcoin, Hyperledger, Ethereum, Ripple, and Multichain blockchain platforms through our applied learning methodology. Through this blockchain course, you will gain real-life experience via 4+ hands-on projects. Upon completing this certification, you will be able to set your blockchain network using Hyperledger Composer and use smart contracts on Ethereum.
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Q What Do You Need To Learn In Order To Start Developing On The Blockchain
Though the answer to this question is too vast, let us summarize in a few basic pointers:-
- Strong knowledge of the basics of Blockchain development, i.e. its characteristics and popular platforms.
- Awareness of the points of failure in the overall system.
- Expertise at top Blockchain programming languages.
- Familiarity with the popular cryptocurrencies and the concept of cryptocurrency mining.
- A background in web development, networking, and security.
Ethereum And Solidity: The Complete Developers Guide
- Learn concepts about Blockchain and Ethereum.
- Build design and deploy your application.
- Create secure smart contracts.
Here is the link to join this course Ethereum and Solidity: The Complete Developers Guide
The best thing about this course is that its created by Stephen Grider, who is one of the best instructors on Udmey and author of courses like Modern React with Redux on Udemy, which is joined by more than 200K developers.
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Join A Blockchain Programming Community
Remember the saying that no man is an island? The same holds true in the world of blockchain programming. You will need to keep learning to stay relevant and there is no better place to stay updated and get guidance than amidst like-minded professionals.
Blockchain is still in its nascent stages and source material as to the technology is still relatively new in comparison with other database-oriented languages. What this means is that you could run into coding obstacles from reading a book or watching a video. An online or offline blockchain programming community may be your only rescue in such a situation.
There is virtually a user group for just about every major programming language. The good thing about these communities is that you will be exposed to experts with varying degrees of experience. There is also the possibility that someone else may have encountered and solved the coding challenge you are currently facing.
Developers in a community will often discuss whats new in their language of choice, challenges they have encountered, as well as different ways of solving problems. As a new developer, you will meet people, learn about industry standards, and gain practical advice on the necessary skills you may need to accomplish your goals. You may also have some of your rigid ideas challenged.
Some of the popular communities for blockchain developers include Reddit, Blockgeeks, Medium, and IEEE Blockchain community.
How To Learn Blockchain Programming
Trying to learn blockchain programming can feel very overwhelming! You will surely come across many new concepts, terms, programming languages, and developer tools. It can feel like you are stepping into a different world entirely. In many ways, you are! Thats because building blockchain technology is a fundamental paradigm shift from building traditional web technology. There is a reason that the blockchain revolution is often referred to as the arrival of Web 3.0. While some aspects of Web 2.0 are here to stay, others are replaced by new ways of solving problems that old ways could not. There is a steep learning curve to overcome in order to understand the blockchain, and how to build applications for it.
How can you overcome this learning curve faster? How can you make learning blockchain programming easier?
This task-oriented approach starts with identifying a question that you want to know the answer to, then identifying the task that will give you the answer. You break this task down into skills, and then acquire the supporting knowledge that will enable you to perform these skills. These steps look like this:
This looks like a round trip that can be visualized like this:
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A Beginners Guide To Blockchain Programming
Youve likely heard of the concept of cryptocurrency and their mining process, which means you have likely heard the term blockchain at least once or twice.
If you still arent really sure what its all about, dont worry. You arent alone, as there are many programmers out there who cant accurately describe blockchain and cryptocurrency, and a far smaller number actually puts one or both terms to use on a regular basis.
Section : Adding The Blocks
Firstly, we will need to know what the last block in the blockchain currently is. For that we use the getLatestBlock function.
getLatestBlock Now that we have determined the latest block, lets see how we are going to add new blocks.addBlock
So, what is happening here? How are we adding the blocks? How are we checking if the given block is valid or not?
Remember the contents of a block?
A block has the hash of the previous block right?
So, what we are going to do here is simple. Compare the previousHash value of the new block with the hash value of the latest block.
Image Courtesy: Lauri Hartikka medium article
If these two values match, then this means that the new block is legit and it gets added to the blockchain.
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How Does Solidity Work
Solidity is a high-level coding language. This means that it is designed to be read and used by human beings! Computer programs are usually written in a high-level language and then translated into a low-level coding language.
Now, if you really want to know how to become a blockchain developer, you must learn about low-level coding languages also.
A low-level coding language is designed to be read and used by computers. Low-level languages are made up of 1s and 0s. This is called binary. Some very clever human beings can write code in binary, but unfortunately, Im not one of them!
Binary Conversion Chart | Source: sciencefriday
When a blockchain developer builds dApps and smart contracts on the Ethereum blockchain, there are rules which guide their design.
For example, if you want to design a new cryptocurrency using Solidity you have to follow a set of rules called ERC20. These rules make it easier to tell how new dApps will work when they are launched on the blockchain.
Ethereum blockchain development happens in a very special place called the Ethereum Virtual Machine.
What Does A Blockchain Developer Do
The wise yet short answer to this is: a Blockchain developer develops Blockchains! Well, that was easy!
Now that we got that out of our system lets take a serious look at what a Blockchain developer does. To best answer this question, we first need to establish that there are two different types of Blockchain developers theres the Core Blockchain Developer and the Blockchain Software Developer. Call them sub-divisions of Blockchain development.
A Core Blockchain Developer designs the security and the architecture of the proposed Blockchain system. In essence, the Core Blockchain Developer creates the foundation upon which others will then build upon.
What others are we referring to? That would be the Blockchain Software Developers, of course, who use the core web architecture built by the Developer to create apps, specifically the decentralized and web varieties.
Perhaps there may be situations where the same person fulfills both roles, most likely in cases where the business is small, and people traditionally wear more than one hat. Whatever the case, the everyday responsibilities and roles of the Blockchain developer are:
- Design the Blockchain protocols
- Design the network architecture that can be used for the centralizing or decentralizing the data
- Backend development according to the Blockchain protocols
- Developing front-end designs according to client requirements
- Developing and monitoring any smart contracts
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Blockchain Technology On Edx
This is another awesome online course to learn Blockchain and become a Blockchain developer. This course is offered by BerkeleyX and it’s also part of professional certification.
Developed by Blockchain at Berkeley and faculty from UC Berkeleys premier Computer Science department, this course provides a wide overview of many of the topics relating to and building upon the foundation of Bitcoin and blockchain technology.
This is also a good course to learn various enterprise-level blockchain implementations, such as JP Morgans Quorum, Ripple, Tendermint, and HyperLedger, including the industry use cases for blockchain, ICOs, and the increasing regulations surrounding blockchain.
Here is the link to join this course Blockchain Technology
This course is effectively free for learning but you need to pay for certificates.
Blockchain Programming Code Example
Now suppose, if we were to mutilate the genesis_block
The output will be as follows:
Here, the value of genesis_block_hash and block1_parent_hash are clearly different while they should actually be the same in the correct Blockchain. As a result, the Blockchain is now corrupted.
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Attend A Coding Boot Camp
Although there is a lot of controversy surrounding the cost and effectiveness of coding boot camps, statistics speak in their favor. A 2017 survey by Indeed revealed that 4 out of 5 US companies have at one point or the other hired a boot camp graduate, with HR managers hinting that they would do it again. Another survey by Course Report found out that around 80% of the graduates from coding boot camps got employed using the skills they learned in boot camps.
Boot camps are arguably the most expensive option on this list. On average, you may spend up to $15,000 to learn blockchain programming in a boot camp. This is not to say that they are your golden ticket to landing a blockchain developer job with Amazon.
If your dream is becoming a professional and full-time blockchain developer, then an intensive and in-person boot camp might suit you. It is faster and more affordable than a traditional college degree. You will also be taught the skills you need to succeed within the blockchain industry in a fraction of the time you might take to learn on your own or earn a computer science degree.
What Is Cryptography
Cryptography is the study and practice of securing private messages so that they can only be read by the intended parties. It involves encrypting and decrypting content using various methods and encryption keys. An unintended third party would not be able to understand the message without the proper key to decode it. Modern cryptography has grown to include many sub-fields of study such as data integrity and user authentication and is vital to ecommerce, banking and much more.
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How Do Accounts Work
One of the big differences in blockchain applications vs traditional web applications is that accounts are managed by the network itself, not necessarily the individual application. For example, in a traditional web application like Gmail, you create a username and password that is stored in a database owned by Google. When you use the blockchain, you have an account that represents you as a user of the entire network, not just the application. Your account is identified by an address, which is a representation of its public & private key pair.
An Ethereum account address looks like this:
In fact, this is the `from` account from the above code example. This account address is represented by a hex string. It has an associated account balance in Ether. Whenever you run the code example, you are essentially sending money from one user on the network to another user.
Get Familiar With Decentralized Applications
As a blockchain developer, you need to develop decentralized applications using blockchain technology. There are several blockchain platforms that can be used in building DApps. Lets learn some basic information about some popular blockchain platforms from below:
- Hyperledger: It is a permission private Blockchain that plays a key role in developing Hyperledger tools. You must have knowledge about two projects, namely, Hyperledger Fiber and Hyperledger Composer.
- EOS: This platform supports industrial-scale applications. Also, it has more scalability and higher transaction speed like ethereum. So the application of EOS is also widely spread across the blockchain ecosystem.
- NEO: This blockchain platform is not limited to one programming language. Therefore, a beginner programmer having knowledge of basic programming language can easily get hands-on experience in this blockchain platform. For example, developing DAapps on NEO, you can use JAVA and C#. This platform has a great opportunity in digital business.
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Ethereum Development Course Blockchain At Berkeley
This is a good, practical course to begin your journey with Ethereum Blockchain Development, where you will learn how to create a Hello World Blockchain app in no time.
This course is designed for programmers beginning their journey with Ethereum Blockchain Development and want to test their skills with a basic practical project before moving forward with more advanced Ethereum Development courses covering much more.
Here is the link to sign up for the FREE Ethereum Development Course Blockchain at Berkeley
If you want to learn more about Etherium you can also join a more comprehensive course like Ethereum Development Fundamentals from 101 Blockchains, a specialized training portal for everything related to Blockchain. This course teaches Ethereum development in great detail.
Its a bit costly and you need to pay $199 to get access to the course but you can also use my code BCHAIN30 to get the 30% OFF.
Whether you are an engineer, developer, or architect, if you want to open the doors to build a blockchain career path in development, this course will help you with the fundamentals.
If you are interested more in developing with Etherium network then I definitely suggest you to check out this awesome Etherium development course.