Blockchains are incredibly popular nowadays. But what is a blockchain? How do they work, what problems do they solve and how can they be used?
Like the name indicates, a blockchain is a chain of blocks that contain information. This technique was originally represented in 1991 by a bunch of researchers and was originally supposed to timestamp digital documents in order that it’s impossible to affect them or to tamper with them. Almost like a Notary. However, it slid largely unused until it had been tailored by Satoshi Nakamoto in 2009 to form the digital cryptocurrency Bitcoin. A blockchain may be a distributed ledger that’s fully open to anyone. They have an interesting property: once some data has been recorded inside a blockchain, it becomes very difficult to change it. So how does that work? Well, let’s take a closer look at a block.
Each block contains some data, the hash of the block and the hash of the previous block. The data that is stored inside a block depends on the type of blockchain. The Bitcoin blockchain, for example, stores the details about a transaction in here, such as the sender, receiver and amount of coins. A block also has a hash. You can compare a hash to a fingerprint. It identifies a block and every one of its contents and it is often unique, just as a fingerprint. Once a block is formed, it’s hash is being calculated. Changing one thing within the block can cause the hash to alter. Therefore in other words: hashes are terribly helpful when you need to discover changes to blocks. If the fingerprint of a block changes, it no longer is the same block. The third element inside each block is the hash of the previous block. This effectively creates a chain of blocks and it’s this technique that makes a blockchain so secure.
Let’s take an example. Here we have a chain of 3 blocks. As you can see in the above image, each block has a hash and the hash of the previous block. So block number 3 points to block number 2 and number 2 points to number 1. Now the first block is a bit special, it cannot point to previous blocks because it’s the first one. We call this the genesis block. Now let’s say that you tamper with the second block. This causes the hash of the block to alter also. in turn which will build block three and all following blocks invalid as a result of they no longer store a legitimate hash of the previous block. Thus ever-changing one block can build all following blocks invalid. However, using hashes isn’t enough to stop tampering.
Also Read: What is Deep Web?
Computers currently are very fast and may calculate many thousands of hashes per second. You’ll effectively tamper with a block and compute all the hashes of different blocks to create your blockchain valid once more. Thus to mitigate this, blockchains have one thing referred to as proof-of-work. It is a mechanism that slows down the creation of new blocks. In Bitcoins case: it takes about ten minutes to calculate the desired proof-of-work and add a replacement block to the chain. This mechanism makes it terribly exhausting to tamper with the blocks because if you tamper with one block, you’ll have to compute the proof-of-work for all the subsequent blocks. Therefore the security of a blockchain comes from its inventive use of hashing and also the proof-of-work mechanism.
But there’s another approach that blockchains secure themselves and that is by being distributed. Instead of using a central entity to manage the chain, blockchains use a peer-to-peer network and anyone is allowed to join. When someone joins this network, he gets the full copy of the blockchain. The node can use this to verify that everything is still in order. Now let’s see what happens when someone creates a new block. That new block is sent to everyone on the network. Each node then checks and ensure that block to make sure that it hasn’t been tampered with. If everything checks out, each node adds this block to their own blockchain. All the nodes in this network create consensus. They agree about what blocks are valid and which aren’t. Blocks that are tampered with will be rejected by other nodes in the network. So to successfully tamper with a blockchain one need to tamper with each and every block on the chain, redo the proof-of-work for each block and take control over 50% of the peer-to-peer network. Only then will your tampered block become accepted by everyone else. This is almost impossible to do!
Blockchains are also constantly evolving. One of the more recent developments is the creation of smart contracts. These contracts are simple programs that are stored on the blockchain and can be used to automatically exchange coins based on certain conditions. The creation of blockchain technology caught the interest of a lot of people. Soon, many realized that this technology can be used for other things like storing medical records, creating a digital notary or even collecting taxes.
So now you know what a blockchain is, how it works on a basic level and what problems it solves. Hope you liked this article. Mention your queries in the comments section below. We will try to solve them as soon as possible.
Now you can play PUBG for only 6 hrs / day
Player Unknown’s Battlegrounds (PUBG), the known and trending battle royal game that has sparked a wave of fan following in Asian country, seems to be obtaining daily usage restrictions.
Some players of the sport have rumored that the title serves health reminders and stops operating once an exact amount of your time.
The modification comes within the inside of reportable deaths and addiction issues over the sport.
6-hour restriction on PUBG Mobile
Multiple PUBG players have taken to Twitter to report that the mobile version of the sport’s problems a health reminder once 6-hour usage and so stops playing.
After this, once PUBG is launched, it serves a message saying “You’ve played the game for six hours today,” and prompts the user to return back at 5:30 am on the following day to continue taking part in.
All players in India will currently play the sport for under six hours per day. Players below eighteen can receive a reminder each 2 hours (at two and four hours of game time).
Health remainder on @PUBGMOBILE . One of my friend played it for 6 hours it seems an . #PUBG To the next level. @Im_Rahul16 Take care of your health daww.. 🤣😂 ¼ part of day well spent with @PUBG pic.twitter.com/6nOUTrvglh
— Srihari Lakshminarasimhan (@Srihari_lsr) March 21, 2019
So far, Tencent, the maker of the game, has not created an official announcement in respect to the introduction of those restrictions.
However, the screenshots doing rounds on the web clearly recommend that the corporate is willing to implement the aptitude shortly.
However, the announcement was created on the official discord server of the game wherever one amongst the moderators revealed the following message-
“Due to political concerns in India, a play time restriction of six hours has been imposed. This applies to all Indian players regardless of their age. The restriction does not affect players of other regions than India. Players below the age of 18 will receive a reminder after two and four hours, this before the six-hour restriction is reached.
Note: It may take some time for these changes to take full effect and apply to every Indian player.”
The only question as of now could be once it’ll happen at the large scale and the way the general public will react.
PUBG is insanely big popular in the youth of INDIA.
Over the previous few months, PUBG has raked large quality in Republic of India and alternative components of the planet.
The user-base of the sport has big therefore massive that folks have started raising addiction alarms, business for a state ban on the sport.
Notably, it’s already been illegal in Gujarat, due to multiple reports of death. And many players have been arrested in playing PUBG in public areas.
Apple Watch Caring like a Human – Saves Lives
Apple Watch has become a lifesaver on over one occasion and it adds another feather to the hat by saving a user with its timely designation. The inbuilt heart-rate device within the Apple Watch may be a corking feature obtainable within the most well-liked wearable out there and it’s attributable for correct readings from most of its users. In one such instance, Apple Watch prompted its user to travel to the hospital once detecting uncommon activity within the pulse.
Science Friday radio host Ira Flatow shared his grateful expertise with Apple Watch on Twitter on Thursday, once his brother’s life was saved by the Watch’s impromptu designation. in line with Flatow, his brother’s Apple Watch hit a warning upon striking >200bpm pulse rate and instructed he pay a visit to the hospital.
After obtaining checked up at the hospital, Flatow’s brother was diagnosed with cardiac arrhythmia, a condition wherever the resting pulse rate exceeds the traditional gait (beats per minute). for many adults, a resting pulse rate is considered traditional between 60-100bpm. something on top of 100bpm is considered risky and Flotow’s brother’s pulse rate had broken 200bpm, business for immediate medical attention.
After Flatow’s brother was admitted to the hospital, he found that the Apple Watch readings matched with those of the hospital medical instrumentality all the time. “During the fifteen hours I used to be at the hospital attached to the monitors, the monitors ne’er disagreed with my watch’s reading. I checked repeatedly,” Flatow tweeted quoting his brother.
2/ He says … “and BTW, during the 15 hours I was at the hospital hooked up to the monitors, my the monitors never disagreed with my watch’s reading. I checked MANY times.”
— Ira Flatow (@iraflatow) March 7, 2019
Even though Apple Watch’s intrinsic heart-rate device may be a reliable tool to discover uncommon pulse activity, the favored wearable remains not absolutely able to replace the advanced EKG machines. however, obtaining an early designation while not having to bear a series of tests in unsuspecting people is definitely a boon.
This is not the primary time Apple Watch has been attributable to saving lives. Recently, Gaston D’Aquino, a semi-retired diamond dealer, thanked Apple chief executive officer Tim Cook once his Apple Watch saved him from a dangerous heart condition, giving him “a new lease on life.” Apple Watch conjointly helped diagnose a teen’s urinary organ disorder and another user thanked Apple for sleuthing elevating pulse rate, that clothed to be an embolism.
Apple introduced watches’ 5.1.2 for its smartwatches, that enabled EKG to perform within the Apple Watch Series four and also the Irregular Rhythm Notification for all models. Ever since Apple Watch reportedly saved various lives.
DIGITAL HEALTH MARKET may value over $500 BILLION
The digital health market might reach a worth of $504 billion globally by 2025, and $7 trillion is spent on health care around the world per annum. That’s 10 % of the world’s GDP and also the biggest pay for global governments. health care wearables alone are expected to hit a market price of nearly $18 billion by 2021.
Apple has created no secret that it sees a future far away from the product just like the iPhone and iPad. CEO Tim Cook, in keeping with CB Insights, has aforementioned the health care market makes the smartphone sector look “small.” the corporate has discharged a Health Record and further its heart observance to the Apple Watch. The device conjointly has “fall” detection and an emergency SOS feature.
Huawei Matebook 13: Macbook Air killer
Huawei’s Matebook X which was released last year was considered as the MacBook Pro killer as it provided a lot of features which the MacBook Pro provided at a much affordable price. And this year, Huawei is back with Huawei Matebook 13 which offers specification between the ultra-slim Matebook X and the pocket-friendly Matebook D.
With Matebook 13’s premium Aluminum alloy and metal unibody finish, Intel Whiskey lake processor and thin bezel display, it can be clearly observed as a competitor for the Apple’s new 2018 MacBook Air. The release took place at CES 2019. Let’s have a closer look at the details of Matebook 13.
Starting with the display, it has 13-inch 3:2 touchscreen display which is super sharp with 2,160 x 1,440 resolution. Display provides rich colors with ample viewing angles. Taking a look towards the bezels, company says they are 4.4mm thin providing 88 percent screen to body ratio which is 6 percent more than the rivals MacBook Air with 82 percent screen to body ratio.
Moving to the keyboard, Matebook 13 offers a bigger touchpad than usual which will help you with better space and provide the rich user experience. Matebook 13 comes with an edge-to-edge comfortable keyboard with a 1.2mm travel between each key which is efficient to provide smooth and fast typos which makes it a thumbs up for those who hate Macbook Air’s low-travel keyboard although it is also pretty good. The keycaps barely come out and are not too loud or clicky. It has embedded fingerprint sensor on the power button which makes it easier to wake the computer up by just scanning the finger. With fingerprint sensors come to the security and to enhance it, Huawei has provided an independent security chip for storing the biometrics.
Let’s have a look over the heart of the machine. The Matebook 13 is very capable machine in terms of processing. The device will have two configurations in the US. The higher-end version packs in eight-generation Intel Core i7-8565U chipset coupled with NVIDIA GeForce MX150 graphics card, on the other hand, low-end version ships with Intel Core i5 and Intel’s UHD620 graphics. Both the versions of Matebook 13 will have 8GB of RAM which will be standard considering the price range. The Matebook 13 having quad-core will be having a good multitasking ability which will be a serious upgrade than the MacBook Air which includes a dual-core processor.
Although providing the great performance the weight and thickness of the device matters a lot. The Matebook 13 comes with a 14.9mm thickness which company says is 6 percent thinner than the 2k18 MacBook Air which has 15.9mm thickness. Although the Matebook 13 is thinner than the MacBook Air, it weighs 2.82 pounds which is heavier than the 2.75 pounds MacBook Air.
The Matebook 13 has squeezed a lot of powerful chipsets in such a small device which they mention is due to Shark Fin 2.0 thermal setup which has the capability to handle 8,000 rpm without overheating the device. Huawei has provided dual fan system placing them between the CPU and GPU which enables to separate the heat and also accomplish 25 percent higher volume than a traditional fan. The company also says that cooling system uses an “intelligent filtering solution” which is claimed to manage performance and reduce the fan noise.
Huawei also praised the Shark Fin 2.0 setup for helping them to dedicate almost 50 percent of the laptops underhood space to embed massive 42Whr battery but it is bit smaller as compared to the 57Whr battery of Macbook Air. According to the Huawei’s claim, the low-end version, which is Core i5 Matebook 13, will last up to 10 hours while playing a 1080p video which will be great if it is able to hold on its words.
Following the previous models of Matebooks, the Matebook 13 also comes with two USB-C ports and one headphone jack. But Huawei has included a dock which places in USB – A port, USB-C port, VGA and HDMI port as well. Webcams are important for the video conferences and to help with it, the Matebook 13 houses a one-megapixel camera into its bezel, which makes it at a better place as compared to Matebook X Pro which hid the webcam under one of the keys in the keyboard.
With a webcam you also need good speakers to make the video conferences lively and to do so, the Matebook 13 has two speakers docked into the keyboard with Dolby support giving out the crisp and clear sound.
Huawei also provides a 65W USB-C power adapter which can be used for fact charging the laptop. The Matebook 13 is claimed to provide 2.5 hours of “office work” which may include working with spreadsheets, emails, internet surfing etc. when charged for 15 minutes.
At last, if we list the highs of the device it will go as follows:
- High performance with Whiskey Lake processor
- Efficient design making is slim and light
- High screen to body ratio
- Affordable price
The Matebook 13 truly looks a well-built laptop to compete with Apple Macbook Air. The base version of Matebook 13 which includes Core i5 with 256GB SSD and 8GB RAM will be available in Silver color and will cost $999 and the higher end version with Core i7 with NVIDIA GeForce MX150 graphics and 512GB SSD will start from $1,299. The Matebook 13 will be on sale from January 29 on Amazon and Newegg.
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