블록 체인? - 노드? 무엇에 쓰는 물건인가?

 

 

 

블록체인은 디지털 정보의 저장과 전송 방식을 혁신적으로 변화시킨 분산 원장 기술입니다. 이 기술은 데이터의 투명성, 무결성, 보안성을 보장하며, 다양한 분야에서 새로운 가능성을 열어가고 있습니다. 블록체인을 독창적으로 설명하기 위해, 이를 하나의 거대한 디지털 도서관에 비유해 보겠습니다.

 

 

blockchains' image

 

가. 블록체인: 거대한 디지털 도서관

  1.  책장과 책: 블록과 체인 

블록체인을 거대한 도서관으로 생각해 봅시다. 이 도서관은 수많은 책장으로 구성되어 있고, 각 책장은 많은 책을 보관하고 있습니다. 여기서 책장은 '블록'을, 책장은 서로 연결되어 있는 도서관 전체는 '체인'을 의미합니다.

-  블록(Block) : 하나의 책장에는 일정한 양의 정보(트랜잭션)가 기록된 책들이 있습니다. 블록은 정보가 가득 차면 닫히고, 다음 블록으로 넘어갑니다.
-  체인(Chain) : 각 블록(책장)은 이전 블록과 연결되어 있으며, 이 연결 고리가 바로 블록체인의 '체인'입니다. 이 체인은 시간순으로 연결되어 정보의 흐름을 따라갈 수 있게 해 줍니다.

 

  2.  사서: 분산 네트워크의 노드 

이 도서관에는 여러 명의 사서가 있습니다. 이들은 도서관의 모든 책장을 감시하고, 새로운 책이 추가될 때마다 이를 기록합니다. 여기서 사서들은 블록체인의 '노드'입니다.

-  노드(Node) : 블록체인의 네트워크에 참여하는 모든 컴퓨터입니다. 각 노드는 동일한 복사본의 블록체인을 가지고 있으며, 새로운 블록이 추가될 때마다 이를 검증하고 기록합니다.
-  분산 원장(Distributed Ledger) : 도서관의 모든 사서가 동일한 책 목록을 가지고 있어, 누군가 책을 빌리거나 반납할 때 모든 사서가 이를 기록합니다. 이는 블록체인의 분산 원장과 동일한 개념으로, 모든 노드가 동일한 정보를 공유합니다.

 

  3.  책장 봉인: 암호화와 해시 

책장이 가득 차면, 사서들은 이 책장을 봉인합니다. 봉인을 위해 특별한 도장을 사용하며, 이 도장은 암호화와 해시 함수를 의미합니다.

-  암호화(Encryption) : 책장에 기록된 정보는 암호화되어 있어, 허가된 사람만이 이를 읽을 수 있습니다.
-  해시(Hash) : 책장을 봉인할 때 사용된 도장은 해시 함수의 결과입니다. 이 도장은 고유하며, 책장의 내용이 조금이라도 바뀌면 완전히 다른 도장이 만들어집니다. 이는 정보의 무결성을 보장합니다.

 

  4.  신간 출판: 새로운 블록 추가 

새로운 책이 출판될 때마다, 도서관은 이를 기록하고 새로운 책장을 만듭니다. 여기서 새로운 책은 새로운 트랜잭션을, 새로운 책장은 새로운 블록을 의미합니다.

-  새로운 블록 : 새로운 트랜잭션이 발생하면, 이를 모아 새로운 블록을 생성합니다. 이 블록은 이전 블록에 연결되어 체인의 일부가 됩니다.

-  검증(Consensus Mechanism) : 모든 사서(노드)는 새로운 책이 도서관 규칙에 맞는지 검토합니다. 이를 위해 합의 메커니즘이 사용됩니다. 예를 들어, 비트코인은 작업 증명(Proof of Work)을, 이더리움은 지분 증명(Proof of Stake)을 사용합니다.

 

  5.  불변의 기록: 신뢰와 투명성 

이 도서관에 한 번 기록된 책의 내용은 수정할 수 없습니다. 이는 블록체인의 가장 큰 장점 중 하나인 불변성을 나타냅니다.

-  불변성(Immutability) : 한 번 기록된 블록은 변경할 수 없습니다. 이는 데이터의 무결성을 보장하며, 신뢰할 수 있는 기록을 제공합니다.
-  투명성(Transparency) : 모든 노드가 동일한 정보를 가지고 있으므로, 누구나 도서관의 기록을 검토할 수 있습니다. 이는 블록체인의 투명성을 보장합니다.

 

나. 블록체인의 응용 분야

1.  금융 : 비트코인과 같은 암호화폐를 통해 빠르고 안전한 거래를 지원합니다.
2.  공급망 관리 : 제품의 생산부터 배송까지의 과정을 추적하여 투명성과 신뢰성을 높입니다.
3.  의료 기록 : 환자의 의료 기록을 안전하게 보관하고 공유하여 의료 서비스의 효율성을 높입니다.
4.  부동산 : 소유권 기록을 블록체인에 등록하여 부동산 거래의 신뢰성을 높입니다.
5. 디지털 신원 : 개인의 신원을 안전하게 관리하고, 인증 절차를 간소화합니다.

 

 

다. 결론

블록체인은 단순한 기술을 넘어, 데이터의 저장과 전송 방식을 혁신적으로 변화시키는 도구입니다. 이를 통해 우리는 더 안전하고 투명한 사회를 만들 수 있습니다. 마치 거대한 디지털 도서관처럼, 블록체인은 정보를 안전하게 보관하고 공유하며, 신뢰할 수 있는 기록을 제공합니다. 이는 다양한 산업에 적용되어 우리의 삶을 더욱 편리하고 안전하게 만들어 줄 것입니다.

 

 

 

 

 

 

 

Blockchain? - Black? Is it a chain? Is it a car chain?

 

 

Blockchain is a distributed ledger technology that has revolutionized the way digital information is stored and transmitted. The technology ensures the transparency, integrity, and security of data, and is opening up new possibilities in various fields. In order to explain blockchain in an original way, let's compare it to one giant digital library.

A. Blockchain: A Huge Digital Library

1. Bookshelf and Book: Blocks and Chains
Let's think of blockchain as a huge library. The library is made up of countless bookshelves, and each one holds many books. Here, the bookshelf means 'block' and the bookshelf means 'chain' as a whole connected library.

- Block: One bookcase contains books that record a certain amount of information (transactions). Blocks close when they are full of information, and then move on to the next block.
- Chain: Each block (bookcase) is linked to the previous block, and this link is the 'chain' of the blockchain, which allows you to follow the flow of information in chronological order.

2. librarian: nodes in distributed networks
The library has several librarians. They monitor every bookcase in the library and record every new book as it is added. Here, librarians are the 'node' of the blockchain.

- Node: Any computer that participates in the network of the blockchain. Each node has a blockchain of the same copy, and each time a new block is added, it verifies and records it.
- Distributed Ledger: Every librarian in the library has the same list of books, so every librarian records it when someone borrows or returns a book. This is the same concept as the distributed ledger on the blockchain, where all nodes share the same information.

3. Bookshelf Seal: Encryption and Hash
When the bookshelf is full, librarians seal the bookshelves. A special seal is used for sealing, which stands for encryption and hash functions.

- Encryption: The information recorded on the bookshelf is encrypted, so only authorized people can read it.
- Hash: The seal used to seal the bookshelf is the result of a hash function. This seal is unique, and any slight change in the contents of the bookshelf creates a completely different seal. This ensures the integrity of the information.

4. New Book Publishing: Add New Blocks
Whenever a new book is published, the library records it and creates a new bookcase. Here, a new book means a new transaction and a new bookcase means a new block.

- New Block: When a new transaction occurs, a new block is collected to create a new block. This block is connected to the old block and becomes part of the chain.
- Consensus Mechanism**: All librarians (nodes) review new books to ensure they meet library rules. For this, a consensus mechanism is used. For example, Bitcoin uses Proof of Work and Ethereum uses Proof of Stake.

5. Unchanging Records: Trust and Transparency
Once recorded in this library, the contents of a book cannot be modified, indicating one of the biggest advantages of blockchain: immutability.

- Immutability: Once recorded, blocks cannot be changed, which ensures the integrity of the data and provides a reliable record.
- Transparency: Since all nodes have the same information, anyone can review the library's records, which ensures the transparency of the blockchain.


B. Application of blockchain

1. Finance: Supports fast and secure transactions through cryptocurrencies such as Bitcoin.
2. Supply Chain Management: Increase transparency and reliability by tracking the process from production to delivery.
3. Medical Records: Securely store and share patients' medical records to increase the efficiency of healthcare.
4. Real Estate: Increase the reliability of real estate transactions by registering ownership records on the blockchain.
5. Digital identity: Securely manage your personal identity and simplify the authentication process.


C. Conclusion

Blockchain is a tool that goes beyond just technology and revolutionizes the way data is stored and transmitted. It allows us to create a safer and more transparent society. Just like a huge digital library, blockchain keeps and shares information securely, and provides reliable records. It will be applied to various industries and make our lives more convenient and secure.