Let's learn the knowledge of topic blockchain with 30 seconds quizzes!

Does blockchain change the world !?
Do not miss this wave!

Learn fun, easy, and effective skills!
Built-in blockchain simulator!

- Easy operation
- Various questions
- Number of questions 100 or more!
- Quiz corresponding to the latest distribution news
- Built-in blockchain simulator
- Clear user interface
- Intuitive animation
- Compatible with a wide range of devices with iOS 9.3 or later
- iPod, iPhone, iPad
- Various settings Dark / Lite theme
- Issue internal certificate


- Easy operation
Just answer by clicking on the 4 option button to the 30 seconds limit quiz question !!

- Various questions
It covers from basics to difficult problems that require calculation.
You can understand why blockchain is paying attention.

- Number of questions 100 or more!
Although many questions are included, it is not a burden because it is subdivided.
Since it is a stage of 10 questions, you can answer quickly to a quiz in the free time.

- Built-in blockchain simulator
Blockchain technology seems difficult at first glance.
With a simulator, we made it visible by eye.
Believe it or not, the simulator actually builds a blockchain inside.
In other words, it generates a transaction, performs a hash calculation, executes the PoW consensus algorithm, performs mining work, and builds a blockchain.
Furthermore, we actually set "difficulty" and visualize it.
You can visually understand how the technical items for understanding the blockchain are intertwined and working.

- Quiz corresponding to the latest distribution news
Regularly quizzes will be delivered to the technical trends of blockchain updated daily.
By answering the latest quiz to be delivered, you can automatically follow the latest blockchain technology.

- Easy user interface and animation
Since it is a card format with animation, there is no annoying operation.
Since necessary information such as a progress bar is visualized, it can be understood intuitively.

- Compatible with a wide range of devices with
Available on iOS 9.3 or higher devices
It works on iPod, iPhone, iPad.
We check the operation on Portrait / Landscape screen.

- Various settings
Dark / Lite theme and color
You can change the theme by day or night, or with your choice.
Available in multiple languages.

- Internal certificate
Certain grades, certificates will be issued!



## What is Blockchain?

Blockchain is a published **record** connected in a super simple manner, like the chain, on the Internet.

A blockchain is a structure in which countless blocks are linked in a chain.
A block contains information for a certain period of time and it is connected like a chain.

There are several reasons why blockchain is paid attention, and if you raise some of its revolutionary points,

- No administrator
Records are updated arbitrarily on the Internet
(Central bank, somewhat dictatorship administration state, enterprise of commission business, bank / insurance industry, cold sweats?)

- Bitcoin system using blockchain technology
**System has never stopped since full-scale operation in 2009**
(Have you noticed news that the system of a big company in somewhere has stopped, hacked, etc?)


Blockchain is simultaneously promising technologies such as AI, machine learning, deep learning at the same time, and are expected to be applied to various fields in the future.
Depending on the field, the technology is said to have a **destructive effect**.

Users can exchange information among individuals (without administrator) via blockchain.
(explain in detail later)

Bitcoin's blockchain is open to all users and can be checked from the following site, for example.
https://blockchain.info/