Skip to main content

Featured post

8 Top Data Science Platform Developers in the World

Top data science tools and platforms providers across the world. Useful information for data science and data analytics developers.

Data Science is a combination of multiple skills. AI and Machine Learning are part of data science. You can create AI and Machine Learning products with data. 

Related Posts

Top Skills You Need for Data Science CareerData Science Sample Project an Example

Blockchain real story useful beginner to professional

Satoshi Nakamoto created first Blockchain project wished Bitcoin to be secure, anonymous and could work with no centralized intermediary. To achieve that, Nakamoto combined public key cryptography, a distributed ledger, and a consensus algorithm.
  • Nakamoto combined public key cryptography, a distributed ledger, and a consensus algorithm. 
  • The groundwork for each component was painfully laid by people before him, such as Wei Dai, Nick Szabo, Hal Finney, and Adam Back, 
  • The Blockchain can sometimes refer to the combination of all three components or just the distributed ledger
Blockchain ideas
Blockchain ideas

As the name aptly describes, at the heart of the Blockchain there is a chain of blocks, each block containing read-only data that represents monetary transactions. Every time a new block is written, you need to reference the block that immediately precedes it – so at any given point, you can track down the chain up to the very first block created.

How blockchain design works

  • The Blockchain is by design a decentralized and autonomous system, and sometimes more than one block gets created. 
  • To keep the integrity of its ledger, a consensus mechanism is used that considers that the longest chain is always the most trustworthy (it will be mentioned later why that is the case) and nodes can only be allowed to blocks to the chain if they solve an arbitrary mathematical puzzle (also more on that later).

Quiz on blockchain

Messages or transactions are exchanged between nodes through a peer-to-peer network, and there are two types of participants: those who generate transactions and "spend coins" and those who gather and record these operations.

To incentivize the processing nodes, the system rewards them with new brand new coins. so they not only do record keeping but also "make currency."

How technology works

Because of the intended strong analogy to precious metal mining, these particular nodes are called "miners."

This can appear trivial, but keep in mind that when you send something digital – a music file, or written document or picture — you are always making copies. Moreover, although, is not a real problem with files, is a big, big problem with digital currencies.


For a digital currency to work it is crucial that once you give it to someone, the money is not in your possession anymore, and you cannot give this same money to someone else.

This does not happen with wire transfers, for instance, because the financial institutions record and share a ledger of all the money that enters and exits their systems.

However, that is a centralized solution that depends that you trust an organization always to keep their "word."

The real process

Every transaction made in the Bitcoin network is directed to a pending transaction list. The transaction itself is a simple message that senders sign with a cryptographic key with an amount, as well as the sender's and recipient's addresses.
  • A node authenticates and integrates these transactions in the blockchain. 
  • It is useful to recall that every block references the block that came before. 
  • The new block has to have a hash value that equals all data it is trying to add to the chain, PLUS all data already stored in past blocks of the blockchain. 

Top blockchain books

Since the subsequent hashes are always dependent on the previous, that makes the blockchain tamper-proof. Remember that for anyone to change any value – even a single bit – in the already calculated block, means that he would need to update the hashes of every subsequent block.

This is heavily time-consuming and makes it harder to modify past blocks of Blockchain. The deeper the block down the "height," the more difficult.

How secure is it?

  1. The records on a blockchain are secured through cryptography. 
  2. Network participants have their own private keys that are assigned to the transactions they make and act as a personal digital signature. If a record is altered, the signature will become invalid and the peer network will know right away that something has happened. 
  3. Early notification is crucial to preventing further damage.

Blockchain Resources

Comments

Popular posts from this blog

Hyperledger Fabric Real Interview Questions Read Today

I am practicing Hyperledger. This is one of the top listed blockchains. This architecture follows R3 Corda specifications. Sharing the interview questions with you that I have prepared for my interview.

Though Ethereum leads in the real-time applications. The latest Hyperledger version is now ready for production applications. It has now become stable for production applications.
The Hyperledger now backed by IBM. But, it is still an open source. These interview questions help you to read quickly. The below set of interview questions help you like a tutorial on Hyperledger fabric. Hyperledger Fabric Interview Questions1). What are Nodes?
In Hyperledger the communication entities are called Nodes.

2). What are the three different types of Nodes?
- Client Node
- Peer Node
- Order Node
The Client node initiates transactions. The peer node commits the transaction. The order node guarantees the delivery.

3). What is Channel?
A channel in Hyperledger is the subnet of the main blockchain. You c…

Blue Prism complete tutorials download now

Blue prism is an automation tool useful to execute repetitive tasks without human effort. To learn this tool you need the right material. Provided below quick reference materials to understand detailed elements, architecture and creating new bots. Useful if you are a new learner and trying to enter into automation career.
The number one and most popular tool in automation is a Blue prism. In this post, I have given references for popular materials and resources so that you can use for your interviews.
RPA Blue Prism RPA blue prism tutorial popular resources I have given in this post. You can download quickly. Learning Blue Prism is a really good option if you are a learner of Robotic process automation.

RPA Advantages The RPA is also called "Robotic Process Automation"- Real advantages are you can automate any business process and you can complete the customer requests in less time.

The Books Available on Blue Prism 
Blue Prism resourcesDavid chappal PDF bookBlue Prism Blogs

PL/SQL: Popular Reserved Words

Perfect in PL/SQL is an art. To become this you need to understand top reserved words and their meanings. The below list is useful for your projects.


Top List of PL/SQL Reserved Words.. Before you start knowing reserved words, wait one moment. The reserved words all are similar to words that you use in normal SQL. ALL*DESC*ISOLATIONOUTSQLERRMALTER*DISTINCT*JAVAPACKAGESTART*AND*DOLEVEL*PARTITIONSTDDEVANY*DROP*LIKE*PCTFREE*SUBTYPEARRAYELSE*LIMITEDPLS_INTEGERSUCCESSFUL*AS*ELSIFLOCK*POSITIVESUMASC*ENDLONG*POSITIVENSYNONYM*AUTHIDEXCEPTIONLOOPPRAGMASYSDATE*AVGEXCLUSIVE*MAXPRIOR*TABLE*BEGINEXECUTEMINPRIVATETHEN*BETWEEN*EXISTS*MINUS*PROCEDURETIMEBINARY_INTEGEREXITMINUTEPUBLIC*TIMESTAMPINTEGEREXTENDSMLSLABEL*RAISE

Automation developer these are top Skills you need to learn

Robotic process automation is an upcoming IT skill. Three tools are popular. It is difficult to learn all three tool. So, learn anyone tool to start your career in automation.
To get a job in this line, I found in my research that some programming skills and Hand-on training on any one of the tools is required. Also, try to know the differences between popular RPA tools.
Skills Companies Looking in Automation Engineers All big companies looking for candidates having experience in Automation anywhere, Blue Prism and UIPath. It is not possible to learn all tools. Learn anyone tool and do practice well.

Ok.

You may ask a question about how to do it. Join in good training institute and learn one tool.  Take online classes to learn faster.

To learn Uipath try here. Also, you can enroll online course to learn UiPath.

UiPath GO The list of IT skills you needAutomation anywhere/Blue Prism/Uipath .Net/C#/Java/SQL skills MS-Visio Power Builder Python scripts/Unix Scripts/Perl Scripts HTML/CSS/J…

8 Top Data Science Platform Developers in the World

Top data science tools and platforms providers across the world. Useful information for data science and data analytics developers.

Data Science is a combination of multiple skills. AI and Machine Learning are part of data science. You can create AI and Machine Learning products with data. 

Related Posts

Top Skills You Need for Data Science CareerData Science Sample Project an Example

Three popular RPA tools functional differences

Robotic process automation is growing area and many IT developers across the board started up-skill in this popular area. I have written this post for the benefit of Software developers who are interested in RPA also called Robotic Process Automation.


In my previous post, I have described that total 12 tools are available in the market. Out of those 3 tools are most popular. Those are Automation anywhere, BluePrism and Uipath. Many programmers asked what are the differences between these tools. I have given differences of all these three RPA tools.

BluePrism Blue Prism has taken a simple concept, replicating user activity on the desktop, and made it enterprise strength. The technology is scalable, secure, resilient, and flexible and is supported by a comprehensive methodology, operational framework and provided as packaged software.The technology is developed and deployed within a “corridor of IT governance” and has sophisticated error handling and process modelling capabilities to ens…

Top 100 Hadoop Complex Interview Questions (Part 3 of 4)

These are complex Hadoop interview questions. This is my 3rd set of questions useful for your interviews. 1). What are the features of Standalone (local) mode? Ans). In stand-alone mode there are no daemons, everything runs on a single JVM. It has no DFS and utilizes the local file system. Stand-alone mode is suitable only for running MapReduce programs during development. It is one of the least used environments.

2). What are the features of Pseudo mode?
Ans). The pseudo mode is used both for development and in the QA environment. In the Pseudo mode, all the daemons run on the same machine.

3). Can we call VMs as pseudos?
Ans). No, VMs are not pseudos because VM is something different and pseudo is very specific to Hadoop.

4). What are the features of Fully Distributed mode?

Ans). The fully Distributed mode is used in the production environment, where we have ‘n’ number of machines forming a Hadoop cluster. Hadoop daemons run on a cluster of machines. There is one host onto which Namenod…

SQL queries how to use built-in functions correctly

In this post I am giving top examples on SQL functions. About built-in functions, I have covered in my previous post.
List of examples:DATE-TIME functionsNumeric functionsChar functionsNull-related functions1. DATE/TIME functions SELECT p_code, launch_dt, CURRENT_DATE FROM product; CURRENT_DATE returns current date.
SELECT p_code, TO_CHAR(launch_dt, 'DD MONTH YYYY') reformatted_dt FROM product; TO_CHAR function returns DATE in CHAR format.
2. Numeric functions SELECT p_code, price, (price - 20), ABS(price - 20.00) FROM product; ABS - function returns absolute value
SELECT p_code, price, ROUND (price, 1) FROM product;
ROUND function - Round to 1 digit.
SELECT p_code, price, SIGN(price - 15) FROM product;
SIGN function - It returns sign; either + or -
SELECT p_code, price, TRUNC(price, 1) FROM product;
TRUNC function - Truncates to a certain number of decimal places.
3. CHAR functions SELECT p_code, CONCAT(CONCAT(p_name, ' -- ') , price) FROM product; CONCAT function - co…