In this digital age, we are faced with a large amount of data and information, and these data and information need a safe and reliable platform for transmission and storage. The blockchain technology that has attracted much attention in recent years was born for this purpose. It is considered to be the next revolutionary technology after the Internet, which can realize the transfer of trust and value without the need for a centralized institution. So, what is blockchain technology? What are its characteristics? In which fields can it be applied? What challenges do you face? This article will discuss these issues in detail.
### The core idea of blockchain technology :
The core idea of blockchain technology is decentralization, that is, removing the centralized organization so that every participant can participate in the entire system. This kind of decentralization feature enables blockchain technology to realize the transfer of trust and value without the need to trust centralized institutions. Specifically, blockchain technology stores data on multiple nodes through distributed storage, and each node has the same copy. This distributed storage can not only improve security and reliability, but also avoid single point Fault.
### Other features of blockchain technology :
In addition to decentralization, blockchain technology has other features, such as immutability, anonymity, and smart contracts. Immutable modification means that once the data is stored on the blockchain, it cannot be tampered with or deleted. This feature can ensure the authenticity and security of the data. Anonymity means that transactions on the blockchain can protect the privacy of users, while smart contracts can realize automation and decentralized applications. 
### Blockchain technology present & future application scenarios :
1. Financial field: Blockchain technology can be used for the application of digital currency and smart contracts. Bitcoin is one of the most famous blockchain applications. It is a decentralized digital currency that enables global payments. In addition, smart contracts can automatically execute contract terms, thereby reducing manual intervention and improving efficiency.
2. Logistics field: Blockchain technology can be used for logistics tracking and supply chain management. Through blockchain technology, logistics companies can track the transportation of goods and realize the transparency and traceability of logistics information. In addition, blockchain technology can connect all links in the supply chain, thereby improving the reliability and efficiency of the supply chain.
3. Medical field: Blockchain technology can be used for sharing and querying electronic medical records. Through blockchain technology, doctors and patients can share and query medical record information, thereby improving the quality and efficiency of medical services. Ali Health is a typical case of using blockchain technology to share and query electronic medical records.
4. Copyright protection field: Blockchain technology can be used for digital copyright protection. Through blockchain technology, the immutability and traceability of digital copyright can be realized, thereby protecting the legitimate rights and interests of digital copyright. Some companies such as Ascribe and Monegraph are typical cases of using blockchain technology to realize digital copyright protection.
5. Public service field: Blockchain technology can be used for the management of public services. Through blockchain technology, the government can realize the transparency and traceability of public services, and improve the efficiency and quality of public services. The Land Administration of Sweden is a typical case of using blockchain technology to realize public service management.
6. Game field: Blockchain technology can be used for the management of game virtual currency. Through blockchain technology, game virtual currency can achieve decentralized management, thereby ensuring the security and reliability of virtual currency. Some game companies such as Enjin and WAX are typical cases of using blockchain technology to realize game virtual currency management. 
Conclusion : Blockchain technology is a very promising technology, which will have a profound impact on the future society. It can realize decentralized applications in finance, medical care, logistics and other fields, improve security and reliability, and at the same time realize automation and intelligence. Although blockchain technology faces some challenges, we believe that these problems will be gradually resolved. We are looking forward to the future and expect blockchain technology to play a more important role in the future development.