Browsed by
Category: My Blog

What is a blockchain?

What is a blockchain?

For some time now, the term blockchain has been emerging on the web and elsewhere, but it is not always easy for some to have a clear idea of what it represents.

The idea of construction and operation is quite simple.

The latter is a means of transmitting, storing, and verifying information in a mathematical and entirely decentralized way.

Let us take a notary as a counter-example. The latter is a trusted and recognized individual who confers (in exchange for payment) on the acts you ask for a pledge of authenticity through his signature.

However, everything is based on this so-called trust that you and others have in him and without which the acts would no longer be of any value. Not only is it theoretically possible for him to lie and validate a litigious act, but it is also conceivable for other individuals to copy his seal and signature to authenticate forgeries.

A revolutionary technological breakthrough

The way the blockchain works is revolutionary in the sense that no trusted third party is necessary and falsification of acts is impossible. The blockchain network is made up of multiple individuals called miners (now several hundred thousand) who are responsible for validating the latter which are in a block by mathematical proof. Once the block is approved, it is linked to the previous ones.

It is not possible for minors to falsify a transaction because, as a result of decentralization, if one of them decides to lie by validating an illegal operation, the others will invalidate it later. Each person can play the role of the miner, thus guaranteeing the neutrality of the network.

Nor is it feasible for a person to do an invalid act as something that is validated because the blocks containing the authentic acts are visible to all. Indeed, each person participating in the network downloads all the blocks (and therefore the acts) since the creation of the network.
Miners get blockchain transaction fees that each person who wishes to enter something in the blockchain must pay (the average fees are generally meager, the equivalent of $0.05 for some cryptos), but also by creating new tokens (or cryptocurrencies) that they can then sell. Indeed, it is the latter that will be used to pay future transaction costs.

Multiple applications of the blockchain are possible, the most famous being its use for crypto-currencies. The first application of the blockchain is bitcoin.

Operation in summary:

  1. Jane wants to send 1 Bitcoin to John. She deposits her transaction in a pool (which contains all transactions pending validation) and deposits a “tip” (transaction fee) for minors.
  2. Miners select from the pool the transactions with the most tips and then put them in a block.
  3. The block is then validated using cryptographic means thanks to the work of the latter. They receive tips and new coins created during this process (ensuring the circulation of new cash).
  4. The block is registered in the blockchain, and anyone can, therefore, see the transactions present in this block (unless the blockchain is private).
  5. John received his Bitcoin because the network validated Jane’s shipment and entered “+1 BTC” in John’s wallet.

Of course, an infinite number of applications are conceivable, such as a decentralized supercomputer, a secure cloud, or even a new Internet. The operation described above will remain the same if blockchains with a different security principle, the Proof-Of-Stake, are introduced. We will not be interested in it in this article.

Clean My Mac – The Ultimate Tool to Clean your Apple Computer!

Clean My Mac – The Ultimate Tool to Clean your Apple Computer!

A new major version of CleanMyMac, not to be confused with MacKeeper, is available. The editor has lightened the interface of its cleaning utility by making the sidebar transparent and modifying other interface elements.

the clean my mac app from macpawThe primary function of the software remains the same: to recover several gigabytes on its hard disk (or SSD) by deleting unnecessary files. Clean My Mac test stands out from previous versions by taking additional files into account.

In addition to removing caches, translations, and logs, among others, the software now proposes to clean up Mail attachments and unnecessary iTunes files (interrupted downloads, damaged backup …).

For Mail attachments, CleanMyMac 3 only selects those that have not been modified. Attachments deleted from the hard drive remain accessible online, via the web version of the email service configured in Mail.

In any case, it is advisable to carefully look at which files will pass through the trap before confirming. The author of these lines never had a bad surprise with the version 3 of CleanMyMac, but the software is extending its field of action, it is better to be careful.

1. Standard Functions of Clean My Mac

This Mac Mac utility software has all the features you can find in other software to clean your Mac computer: clean the hard drive, clear caches, detect and delete duplicate files, remove temporary files, address files Binaries and remove unnecessary language files.

 2. Additional features of Clean My Mac

Removed corrupted startup items, development junk, leftovers application, photo trash, broken preferences, flash driver trash and Mac OS service junk. Also, this Mac also includes an uninstaller application, package analyzer, ignore list applications, drag and a drop features, widget manager, and many other fun things.

CleanMyMac 3 also includes some maintenance scripts (reindexing Spotlight, dumping DNS caches, reconstructing the launch services base …), but it does much less than Onyx on this point – which is free more.

A Privacy section is used to delete web browsing files and the history of Skype and Messages communications.

protect your privacy online

Finally, a dashboard summarizes the hard drive, memory, battery, and processor status. This information can be accessed by clicking on the software icon in the menu bar.

CleanMyMac 3 is sold for 20 € instead of 40 until 14 April. The 50% discount is valid without time limits for users of the previous version. The demo version can only delete 500 MB of files. OS X Mountain Lion minimum is required.

Satellite Internet – How is it Working?

Satellite Internet – How is it Working?

There are a lot of zips and zaps that take place to bring the web from service providers to worldwide users, at lightning fast speed!

By traveling through space at speeds once reserved for science fiction, satellite signals using HuguesNet Generation 4 technology allow world web users even in the most remote areas to enjoy the convenience and brilliance of broadband networks.

Find how this happens

how satellite works through internet

Drones and How they Work ?

Drones and How they Work ?

Long used by the military, drones are now used by private individuals for both recreational and commercial use.

How do they really work?

Generally speaking, a drone is characterized by 4,6 or 8 propellers.

The propeller blades of a drone are fixed, in fact, they can not change angle of inclination. The rotation of the propeller blades is alternated. In the meantime, the alternating inversion of these propellers promotes flight stability.

bebop 2 parrot

The principle of flight is based solely on the movement of the propellers. If all engines run at the same speed, the drone will hover.

To make a movement, advance or back up, the success of the flight is played on the front and rear engines. Similarly, for the right and left movement of the arms. The slowing of the right engines favors the movement to the right. To rotate, increase the speed of motors aligned on an axis. In addition, a drone is also equipped with several technologies. It is powered by an electrical power namely polymer lithium batteries.

How to control the navigation?

The control of a drone requires a particular technique that the individual must learn. Like other flying machines, drones move in the air. The blades of the propellers allow it to perform the flight. Thanks to navigation electronics, you can control a drone from the ground.

The latter obeys you with the finger and the eye. Using a specific device called a radio controller, you can easily influence the movements made by your multirotor. Then the barometer accurately measures the altitude traveled by this flying device.

Finally, using a GPS, you can easily detect the position of your drone. In general, a drone has an autonomy of between 5 min up to 1 h. Most drones can carry mass objects between 1 kg and 10 kg like cameras and video gear. Some custom drones can load large masses.

a dji drone the market leader

Thus, the payload of drones depends on the reason for use.

How to choose your drone?

Known as UAVs, drones play several roles in different areas. Now they are accessible to the general public and can be purchased in the department stores or online.

Whether for professional use or just for fun, the choice of the type of drone must be made depending on your use and needs.

At the moment, drones exist in several models, sizes, pace … Each has distinctive features that make them better. Find more on the trendiest drone of 2017 www.le-mavic.fr