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Interview Questions and Answers

PoW requires miners to solve complex mathematical problems to validate transactions, consuming significant energy. PoS selects validators based on the amount of cryptocurrency they hold and are willing to stake, making it more energy-efficient.

Applications include supply chain management, healthcare, voting systems, digital identity, and finance.

Blockchain can track products from origin to consumer, improving transparency, reducing fraud, and ensuring product authenticity.

Regulatory challenges include uncertainty around legal frameworks, data privacy concerns, and anti-money laundering (AML) compliance.

You can learn through online courses, tutorials, books, conferences, and by joining the Blockchain community. Many universities also offer Blockchain-related programs.

Ethereum is a blockchain platform that allows developers to build and deploy decentralized applications (dApps) using smart contracts. It also has its own cryptocurrency called Ether (ETH).

Decentralized applications are applications that run on a decentralized network, such as a blockchain. They are not controlled by a single entity and are more resistant to censorship.

Mining is the process of validating transactions and adding new blocks to a blockchain. Miners solve complex mathematical problems to earn cryptocurrency rewards.

Disadvantages include scalability issues, regulatory uncertainty, high energy consumption (in some blockchains), and complexity.

Cryptocurrency is a digital or virtual currency that uses cryptography for security and operates independently of a central bank. Many cryptocurrencies are built on blockchain technology.

Bitcoin is the first and most well-known cryptocurrency, built on a public blockchain. It is a decentralized digital currency that can be sent peer-to-peer without intermediaries.

Key features include decentralization, immutability, transparency, security (through cryptography), and efficiency.

There are three main types: public (permissionless), private (permissioned), and consortium (hybrid of public and private).

A public blockchain is open to anyone to join and participate in, such as Bitcoin and Ethereum.

A private blockchain is controlled by a single organization or entity, restricting who can access and participate, often used for internal corporate processes.

A consortium blockchain is governed by a group of organizations, offering a balance between decentralization and control, suitable for collaborative projects.

A smart contract is a self-executing contract written in code and stored on the blockchain. It automatically enforces the terms of an agreement when predetermined conditions are met.

Advantages include increased transparency, improved security, enhanced efficiency, reduced costs, and greater trust.

Blockchain is a decentralized, distributed, and immutable ledger that records transactions across many computers. Its a chain of blocks, each containing a batch of transactions, cryptographically linked together.

Transactions are grouped into blocks, which are then validated by a network of computers using a consensus mechanism. Once validated, the block is added to the chain, creating a permanent and unalterable record.

Blockchain is a distributed ledger technology (DLT) built on a peer-to-peer (P2P) topology that enables data to be stored globally on thousands of servers, thus allowing everyone on the network to see the entries of anyone else in near real-time.

A block records some or all of the most recent transactions that have not yet entered any prior blocks. A block, therefore, is like a ledger or record book page. It gives way to the next block in the blockchain each time a block is 'completed'.

When the decentralized ledger which consists of two hash functions are approved by all or more than 51% of peers, then the said information is recognized as a block.

The goal of the blockchain is to address the issue of double records without the need for a central server.

In Blockchain encryption is really a great factor for the security of data. Using cryptography, Blockchain protects the identity of network users, guarantees secure transactions and protects all kinds of useful information.

To identify a block, you have a cryptographic hash, a digital signature. This is created by hashing the block header twice with the SHA256 algorithm.

Currently, there are 4 types of blockchain networks — public blockchains, private blockchains, consortium blockchains and hybrid blockchains.

Centralization is the key difference between a blockchain and a database. While all records secured on a database are centralised, each participant has a protected copy of all records and all changes on a blockchain so that each user can access the data'

Blockchains are designed to be immutable. Once a block is written to a blockchain, it cannot change.

Yes, it can be done.

Merkle tree is a data structure that is used in cryptocurrencies?, they serve to encode blockchain data more efficiently and securely. They are also referred to as \"binary hash trees.\"

While Proof of Work rewards its miner for solving complex equations, in Proof of Stake, the individual that creates the next block is based on how much they have \"staked\". The stake is dependent on the number of coins the person has for the specific blo

Basic blockchain security is based on principles of cryptography, decentralization, and consensus, which ensure trust in transactions. Each new block connects to all the blocks before it in a cryptographic chain in such a way that it's nearly impossible t

Blockchain Features:

- Data stored in blockchain is immutable and cannot be changed easily.

- Also the data is added to the block after it is approved by everyone in the network and thus allowing secure transactions.

- Blockchain is

Bitcoin

Bitcoin is “digital money” minus all the formal regulations that come with a bank. It’s not a technology or company but your money, held in a digital form.

Some people buy Bitcoin to store money somewhere other than a bank an

For so many reasons, you can trust Blockchain. Given its open-source nature, its compatibility with other business applications. The security. The developers have paid particular attention to keeping up the pace when it comes to its security, as it was in

Blockchain is a transparency machine in which anyone can join the network and, as a result, view all information on that network.

The blockchain is an incorruptible digital ledger of economic transactions that can be programmed to record not just f

-Decentralization, immutability, security, and transparency are the basic benefits of Blockchain technology.

- Without having to be reliant on third parties, blockchain technology allows for verification.

- Append-only is the data structu

Explain with examples that sync with the job description.

Model–view–controller(MVC) is a software design pattern used for developing user interfaces that separate the related program logic into three interconnected elements. Each of these components is built to handle specific development aspects of an applicat

Explain specific instances with respect to the job JD.

Explain specific instances with respect to the job JD.

Use a phased life-cycle plan, Continuous validation, Maintain product control, Use the latest programming practices, Maintain clear accountability for results.

The most common software sizing methodology has been counting the lines of code written in the application source. Another approach is to do Functional Size Measurement, to express the functionality size as a number by performing Function point analysis.

The major parts to project estimation are effort estimation, cost estimation, resource estimate. In estimation, there are many methods used as best practices in project management such as-Analogous estimation, Parametric estimation, Delphi process, 3 Poin

A feasibility study is a study that takes into account all of the related factors of a project — including economic, technological, legal, and scheduling considerations — to assess the probability of completing the project.

Quality control can be defined as a \"part of quality management concentrating on maintaining quality requirements.\" While quality assurance relates to how a process is carried out or how a product is produced, quality control is more the quality managem