Free Blockchain Tutorial | Free Blockchain Video Tutorial | Blockchain Basics

Free Blockchain Tutorial | Free Blockchain Video Tutorial | Blockchain Basics

I have put together Blockchain Basics concepts in a video tutorial format in order to save your time in doing research and extra work. I have tried to cover each and every topic of Blockchain Fundamentals and explained in a very simple way. Each video in this series are short and simple and explained with an easy to understand diagram. If you want to know more about the blockchain or if you want to learn the advanced concept of the blockchain please refer the Udemy URL given in the Link section below

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Must know topics for Ethereum Blockchain developer | Ethereum Blockchain developer Certification

Must know topics for Ethereum Blockchain developer | Ethereum Blockchain developer Certification

Right now, the whole world needs lots of Blockchain developers but there is a lot of scarcity. The first blockchain platform which came up with smart contract is ethereum.

There are two perceptions of users in Ethereum

• Consumers
• Developers

Consumers primarily use wallets to do the ether transfers or interact with any of the Dapp using the metamask wallets.

Developers are the one, who develops Dapp which end users start consuming it. To become a good ethereum blockchain developers you are supposed to understand some concepts, terminologies and architectures.

This article will help you to get started with a list of contents you can start reading with.

1.Why we need the ethereum.

a. Importance of new system

b. User types of Ethereuem

2. Study about Ethereum

 a. Ethereum foundation

 b. Analyse White and Yellow paper of Ethereum

3. How ethereum works

 a. Ethereum network

 b. Accounts & its creation

 c. EVM

 d. Transactions and Types

 e. Gas

 f. Smart contract

 g. What is Block

 h. What is Mining and consensus?

 i. Transaction execution

 j. Wallets

 4. Types of consensus

 a. PoW

 b. PoA

 c. PoS

 5. DAO, & DAPPS

 a. What is DAO

b. What is DAPP

6. Dapp Components

 a. Introduction

 b. Client app

 c. Smart contract

 d. Web3js

 f. Use Metamask to do a transaction

 g. Use the account keys directly to the application

 h. Programming languages - JavaScript

 i. Types of Architecture design

 j. Client, Web3js, Network, Account/wallet.

 k. Client, Middleware, Web3js, Network, Account/wallet

 7. Programming in solidity.

 a. What is solidity

 b. Solidity basics

 c. Solidity Datatypes

 d. Functions and modifiers

 f. Inheritance

 g. Libraries

 h. Solidity Events

 i. ERC20, ERC223, ERC771 Tokens

 j. Auditing security and testing

 k. Using Remix, Testnet, Metamask


8. Dapp development Tools

 a. TestRpc

 b. Ganache.

 c. Infura

 d. Metamask

 f. Truffle Box.

 fa. Develop contracts in truffle

 fb. contracts to testrpc

 fc. Use truffle console

 fd. Deploy contracts to rinkeyby

 fe. Testing smart contracts with truffle

 g. IPFS

 h. Zepplin Contracts

 9. Create Voting app

 a. Define the requirements

 b. Define the functional components and personas

 c. Design the tech stack architecture

 d. Develop Client application

 e. Develop smart contract

 f. Writing the test script

 g. Deploy smart contract with Truffle in testnet.

 h. Integration with UI

 i. Deploy the UI in cloud

 j. Access the application.

10. Top B2C Applications

 a. Slock It

 b. UPort

 c. SkuChain

 d. Storj

 e. EthLance

 f. Supplychain


Join our Ethereum Blockchain Developer training program where we explain each and every topic mentioned above in detail. You can become the better Ethereum Blockchain developer.

KERALA TO USE BLOCKCHAIN TECHNOLOGY FOR FOOD SUPPLY

KERALA TO USE BLOCKCHAIN TECHNOLOGY FOR FOOD SUPPLY

Blockchain Technology has been gaining more widespread adoption ever since investors first took note of the technology in last year’s bull run. Finance and banking are the most obvious applications for Blockchain Technology, closely followed by supply chain logistics. In logistics, blockchains give corporations a plethora of options with regards to shipment data. All inventory could be tracked in real time, and this helps logistics companies to plan for any expected delays due to weather conditions or other reasons. Let’s take a look at how the Indian state of Kerala us using blockchain in logistics to make its food supply more secure.

Kerala Embraces Emerging Technologies Blockchain and IoT

The state of Kerala is all set to utilise blockchain technology in conjunction with the Internet of Things (IoT) to streamline its supply of milk, vegetable, and fish in the state. The project is being implemented through the Kerala Development and Innovation Strategic Council (K-DISC). K-DISC is the state’s think-tank that was created to formulate and implement plans to create a healthy and sustainable ecosystem with the help of new technologies. In addition to spearheading the new programme to implement the distribution system, K-DISK has also started a curriculum to teach students in Kerala about blockchain technology which will help the state get an early mover’s advantage in the emerging fields of blockchain technology.

For this new distribution system, K-DISK is planning to use separate ID tags for every shipment to track them across the entire supply chain. Every segment of the chain will have RFID (Radio Frequency Identification) tags that are integrated with mobile applications to make the supply data available in real time. This will ensure speedy and high-quality delivery of milk, vegetables and fish in the state and also help reduce food wastage due to slow delivery systems.

Blockchain for Crop Insurance in Kerala

Kerala is also planning to use blockchain for its crop insurance scheme to ensure the tamper-proof and efficient processing and settlement of claims for farmers suffering crop losses. Immutable data on the blockchain can help to judge whether the crop loss was due to natural causes or other factors. Additionally, with Blockchain Technology, the need for third-party representatives is reduced as smart contracts can be used to settle disputes between insurance firms and beneficiaries. Chairman of K-DISC, K M Abraham claims that Blockchain Technology in crop insurance would help avoid time-lag in the assessment and delivery of compensation to farmers who suffer losses due to natural calamities.

Agriculture is the biggest employer in the Indian economy with about 70% of the population of the country involved in agriculture-related jobs. However, agriculture in India is still plagued by basic problems of sourcing, distribution, adulteration and low yields. Prime Minister Modi said in a recent speech that Blockchain Technology can help control this problem by real-time monitoring of supply chain operations. Modi claims that Blockchain Technology can bring in transparency in the agricultural trade, starting from the production process to the final delivery of the product to the farmers. This reduces the scope of corruption through middlemen and could help increase the yield for farmers.

Blockchain in Emerging Markets

By taking the lead in the adoption of emerging technology to improve efficiency, Kerala is setting an example for the rest of the emerging markets as well. As recently reported, the state of Andhra Pradesh has also been developing its real estate records on the Blockchain. Storing land records and vehicle registration data on the blockchain made the process much more secure and streamlined to the benefit of the populations in this state. Visakhapatnam in Andhra Pradesh is all set to become the first smart cities which will become a world-class technology hub for financial applications because of its willingness to experiment with upcoming technology.

Top 14 European banks by assets ranked by fintech portfolio companies

Top 14 European banks by assets ranked by fintech portfolio companies

Blockchain decision tree | How to decide when to use blockchain

Blockchain decision tree | How to decide when to use blockchain

Blockchain Certification Program 2018 | Top Certification in Blockchain Technology | Online Certification in Blockchain

Blockchain Certification Program 2018 | Top Certification in Blockchain Technology | Online Certification in Blockchain

Become a Blockchain Architect or Developer by learning from leading Industry Experts. Know how to create blockchain strategies and tools at world’s most comprehensive program in Blockchain.

MAIN TOOLS & LANGUAGES THAT YOU WILL LEARN TO BECOME A TOP BLOCKCHAIN PRO

1. GoLang
2. Solidity
3. node js
4. Hyperledger
5. Ethereum
6. Multichain

Website - http://www.sonitechnology.com/

Course Content - http://www.sonitechnology.com/p/blockchain.html

Trainer Profile - https://www.linkedin.com/in/blockchaintrainer/

Phone - 09738925800

Contact - http://www.sonitechnology.com/#contact

Register for training -
https://docs.google.com/forms/d/1ghqbxkEUiWq1dj50PkkSXFIamGCYSUm77QaZ8FfMLes

BLOCKCHAIN INTERVIEW QUESTIONS PART 12 - What is a distributed ledger technology and its benefit

BLOCKCHAIN INTERVIEW QUESTIONS PART 12 - What is a distributed ledger technology and its benefit

What is a distributed ledger?

·         A distributed ledger is a type of database that is shared, replicated, and synchronized among the members of a decentralized network. 

·         The distributed ledger records the transactions, such as the exchange of assets or data, among the participants in the network.

·         Participants in the network govern and agree by consensus on the updates to the records in the ledger. 

·         No central authority or third-party mediator, such as a financial institution or clearinghouse, is involved.

·         Every record in the distributed ledger has a timestamp and unique cryptographic signature, thus making the ledger an auditable, immutable history of all transactions in the network.

The role of business ledgers

Business networks typically come together at marketplaces where the participants, such as

• ·         producers,
• ·         consumers,
• ·         suppliers,
• ·         partners,
• ·         market makers/enablers, and
• ·         other stakeholders

own, control, and exercise their rights, privileges, and entitlements on objects of value known as assets.

Tangible and physical assets

• ·         Car
• ·         Home

 Intangible and virtual assets

• ·         Deeds
• ·         Patents
• ·         Stock certificates

Asset ownership and transfers are the transactions that create value in a business network.

Problems with current business ledgers

Current business ledgers in use today are deficient in many ways. They are

• ·         inefficient,
• ·         costly,
• ·         subject to misuse and tampering.
• ·         Lack of transparency, as well as
• ·         susceptibility to corruption and fraud

These risks and uncertainties contribute to missed business opportunities.

What is blockchain, exactly?

A blockchain is a

• ·         tamper-evident,
• ·         shared digital ledger

that records transactions in a public or private peer-to-peer network.

Distributed to all member nodes in the network, the ledger permanently records, in a sequential chain of cryptographic hash-linked blocks,

All the confirmed and validated transaction blocks are linked and chained from the beginning of the chain to the most current block, hence the name blockchain.

Blockchain is the digital and decentralized ledger technology that records all transactions without the need for a financial intermediary like a bank.

BLOCKCHAIN INTERVIEW QUESTIONS PART 11 - How Bitcoin network is formed?

BLOCKCHAIN INTERVIEW QUESTIONS PART 11 - How Bitcoin network is formed?

How Bitcoin network is formed?

1. New node (Node number 8) will identify the seed node from the existing network.

2. The new node will ask seed node (node number 5) to respond with its peer node.

3. Seed node will respond with its neighbouring peer node (node number 1 & 7).

4.  The new node can choose which one to peer with.

To get a better understanding in detail join our online or classroom training. Contact us on below number. 

BLOCKCHAIN INTERVIEW QUESTIONS PART 10 - Bitcoin Transaction Life Cycle

BLOCKCHAIN INTERVIEW QUESTIONS PART 10 - Bitcoin Transaction Life Cycle

Bitcoin Transaction life cycle

To get a better understanding in detail join our online or classroom training. Contact us on below number. 

BLOCKCHAIN INTERVIEW QUESTIONS PART 9 - What Is Hashing in Blockchain

BLOCKCHAIN INTERVIEW QUESTIONS PART 9 - What Is Hashing in Blockchain

What Are Addresses on Blockchains?

In the early days of Bitcoin, it was possible to send payments to an IP-address like 104.25.248.32 (which is blockgeeks.com). This was planned to be a convenient method to use Bitcoins without dealing with unhandy public keys and addresses. However, after the Bitcoin developers realized that this way of sending coins could be subject to serious man- in-the-middle-attacks, the option was disabled and did never come back.

The Public Key: Where the Blockchain Address Generation begins

After Pay to IP had been abandoned in Bitcoin, P2PKH became the new standard format for Bitcoin addresses.

It looks like this:

1K31KZXjcochXpRhjH9g5MxFFTHPi2zEXb

A standard P2PKH address has something like 34 signs and starts with a 1.

P2PKH is the abbreviation of “Pay To Public Key Hash.” This means that you pay to a hash of a public key.

Examples of cryptographic hash functions

• MD 5: It produces a 128-bit hash. Collision resistance was broken after ~2^21 hashes.
• SHA 1: Produces a 160-bit hash. Collision resistance broke after ~2^61 hashes.
• SHA 256: Produces a 256-bit hash. This is currently being used by Bitcoin.
• Keccak-256: Produces a 256-bit hash and is currently used by Ethereum.

So what is hashing?

In simple terms, hashing means taking an input string of any length and giving out an output of a fixed length.

In the context of cryptocurrencies like Bitcoin, the transactions are taken as an input and run through a hashing algorithm (Bitcoin uses SHA-256) which gives an output of a fixed length.

As you can see, in the case of SHA-256, no matter how big or small your input is, the output will always have a fixed 256-bits length.

This becomes critical when you are dealing with a huge amount of data and transactions. So basically, instead of remembering the input data which could be huge, you can just remember the hash and keep track.

Various properties of hashing functions and how they get implemented in the blockchain.

A cryptographic hash function is a special class of hash functions which has various properties making it ideal for cryptography. 

There are certain properties that a cryptographic hash function needs to have in order to be considered secure.

1.      Deterministic - This means that no matter how many times you parse through a particular input through a hash function you will always get the same result. 

2.      Quick Computation - The hash function should be capable of returning the hash of an input quickly. If the process isn’t fast enough then the system, simply won’t be efficient.

3.      Pre-Image Resistance - What pre-image resistance states is that given H(A) it is infeasible to determine A, where A is the input and H(A) is the output hash. 

Suppose you are rolling a dice and the output is the hash of the number that comes up from the dice. How will you be able to determine what the original number was? It’s simple all that you have to do is to find out the hashes of all numbers from 1-6 and compare. Since hash functions are deterministic, the hash of a particular input will always be the same, so you can simply compare the hashes and find out the original input.

But this only works when the given amount of data is very less. What happens when you have a huge amount of data? Suppose you are dealing with a 128-bit hash. The only method that you have to find the original input is by using the “brute-force method”. Brute-force method basically means that you have to pick up a random input, hash it and then compare the output with the target hash and repeat until you find a match.

So, while it is possible to break pre-image resistance via brute force method, it takes so long that it doesn’t matter.

4.      Small Changes in The Input Changes the Hash- Even if you make a small change in your input, the changes that will be reflected in the hash will be huge.

5.      Collision Resistant - Given two different inputs A and B where H(A) and H(B) are their respective hashes, it is infeasible for H(A) to be equal to H(B)

BLOCKCHAIN INTERVIEW QUESTIONS PART 8 - How blockchain is different from traditional architecture

BLOCKCHAIN INTERVIEW QUESTIONS PART 8 - How blockchain is different from traditional architecture

Background - The Rising Interest in Distributed Ledger Technologies

Mainframe computers are largely centralized. They typically house all computing power, memory, data storage, and code. Access to mainframes is mainly by 'dumb terminals', which only take inputs and outputs, and do not store or process data.

With the advent of personal computers and private networks, similar computational capabilities were now housed both on the clients, as well as the servers. This, in part, gave rise to the 'client-server' architecture. Massive data sets, which are housed on mainframes, could move onto a distributed architecture. 

Over time, Internet and cloud computing architectures enabled global access from a variety of computing devices. Even though this 'cloud architecture' is decentralized in terms of hardware, it has given rise to application-level centralization (e.g. Facebook, Twitter, Google, etc.).

Currently, we are witnessing the transition from centralized computing, storage, and processing to decentralized architectures and systems.

Distributed ledger technology is one of the key innovations making this shift possible.

Peer-to-Peer Network Architecture

Peer-to-peer (P2P) networks consist of computer systems which are directly connected to each other via the Internet, without a central server.

P2P networks are generally considered to be more secure than centralized networks, as they do not have a single point of attack, as in the case of a server-based network, where the security of the entire network can be compromised if the central server is successfully attacked.

Permissionless P2P systems do not require a set amount of peers to be online and are generally slower.

Permissioned P2P networks have to guarantee uptime and require a high level of quality of service on the communication links.

BLOCKCHAIN INTERVIEW QUESTIONS PART 7 - Do you even need blockchain

BLOCKCHAIN INTERVIEW QUESTIONS PART 7 - Do you even need blockchain

Blockchain is not suitable for all applications. In-fact blockchain is useful for only certain business processes. Please see a flowchart below

BLOCKCHAIN INTERVIEW QUESTIONS PART 6 - What Blockchain can do

BLOCKCHAIN INTERVIEW QUESTIONS PART 6 - What Blockchain can do

The blockchain is so much more than an isolated technology using advanced forms of cryptography and a crowdsourced ledger system. And it’s not only about efficiency or effectiveness… doing things 20 times faster or saving money - it enables people to organize themselves in new and different ways. 

We can replace companies like Uber that are structured to put all the risk in the hand of the drivers while huge profits go to the top with companies where the drivers own the blockchain and own the company, hiring managers to maintain the system. Every mile is driven into the blockchain, rewarding the driver who puts in the work. 

We can create bulletproof voting systems which can result in direct democracy unlike we have ever seen before in society. 

We can replace some companies with many people with companies with few people that are run on pre-determined rules – called DAOs and DACs. With no employees, there’s no theft, graft, profiteering, fraud, bribery et al. 

The blockchain can pave the way to a future where corruption is crushed and a social consciousness is nurtured. 

With the blockchain, we can build organizations with measurable social responsibility and a memory to keep track of their deeds! 

The blockchain can store all that and no one can erase it.

BLOCKCHAIN INTERVIEW QUESTIONS PART 5 - What are the types of Blockchain

BLOCKCHAIN INTERVIEW QUESTIONS PART 5 - What are the types of Blockchain

Types of Blockchain

Blockchain is a type of technology not a single network. It can be implemented in many different ways.

1.      Public Blockchain – Open to everyone to view and access

2.      Private Blockchain – Access to a select group of authorized users.

3.      Hybrid Blockchain – combination of both private and public Blockchain

A permissionless blockchain is also known as a public blockchain, because anyone can join the network.

Bitcoin blockchain, is a permissionless blockchain.

A permissioned blockchain, or private blockchain, requires pre-verification of the participating parties within the network, and these parties are usually known to each other.

The supply chain management is an ideal use case for permissioned blockchains. 

BLOCKCHAIN INTERVIEW QUESTIONS PART 4 - What's a good blockchain use case

BLOCKCHAIN INTERVIEW QUESTIONS PART 4 - What's a good blockchain use case

What's a good blockchain use case?

·         In finance, blockchain networks allow securities trades to be settled in minutes rather than days.

·         In supply chains, blockchain networks allow the flow of goods and payments to be tracked and logged in real time.

To determine whether your use case is a good fit for blockchain, ask yourself these questions:

1.      Is a business network involved?

2.      Is consensus used to validate transactions?

3.      Is an audit trail, or provenance, required?

4.      Must the record of transactions be immutable, or tamper proof?

5.      Should dispute resolution be final?

If you answered yes to the first question and to at least one other, then your use case would benefit from blockchain technology.

A network always needs to be involved for blockchain to be the right solution

BLOCKCHAIN INTERVIEW QUESTIONS PART 3 - What are the business benefits of blockchain

BLOCKCHAIN INTERVIEW QUESTIONS PART 3 - What are the business benefits of blockchain

What are the business benefits of blockchain?

In legacy business networks, all participants maintain their own ledgers with duplication and discrepancies that result in disputes.

However, by using blockchain-based shared ledgers, where transactions cannot be altered once validated by consensus and written to the ledger, businesses can save time and costs while reducing risks.

Immutability mechanisms of blockchain technologies lead to lowered cost of audit and regulatory compliance with improved transparency.

No more intermediaries which can save both time and money. 

Five of the biggest advantages of Blockchain technology. 

Transparency

One of the prime reasons blockchain is intriguing to businesses is that this technology is almost always open source. That means other users or developers have the opportunity to modify it as they see fit. But what's most important about it being open source is that it makes altering logged data within a blockchain incredibly difficult. After all, if there are countless eyes on the network, someone is probably going to see that logged data has been altered. This makes blockchain a particularly secure technology.

Reduced transaction costs

As noted, blockchain allows peer-to-peer and business-to-business transactions to be completed without the need for a third party, which is often a bank. Since there's no middleman involvement tied to blockchain transactions, it means they can actually reduce costs to the user or businesses over time.

Faster transaction settlements

When it comes to traditional banks, it's not uncommon for transactions to take days to completely settle. This is due to protocols in bank transferring software, as well as the fact that financial institutions are only open during normal business hours, five days a week. You also have financial institutions located in various time zones around the world, which can delay processing times. Comparatively, blockchain technology is working 24 hours a day, seven days a week, meaning blockchain-based transactions process considerably more quickly.

Decentralization

Another central reason blockchain is so exciting is its lack of a central data hub. Instead of running a massive data center and verifying transactions through that hub, blockchain actually allows individual transactions to have their own proof of validity and the authorization to enforce those constraints. With information on a particular blockchain piecemealed throughout the world on individual servers, it ensures that if this information fell into unwanted hands (e.g., a cyber-criminal), only a small amount of data, and not the entire network, would be compromised.

User-controlled networks

Lastly, cryptocurrency investors are tending to be really encouraged by the control aspect of blockchain. Rather than having a third party run the show, users and developers are the ones who get to call the shots. For instance, an inability to reach an 80% consensus on an upgrade tied to bitcoin's blockchain is what necessitated a fork into two separate currencies (bitcoin and bitcoin cash)