The Basics of Blockchain

Decentralization is one of the most essential features of blockchain. It means that data is stored, updated, maintained, and operated through a distributed ledger, rather than relying entirely on the servers of a centralized institution.

This structure helps avoid many problems caused by centralized systems, such as server outages, hacking incidents, or the failure and unreliability of centralized organizations.

Why is decentralization considered the most important feature of blockchain?

The idea originates from Bitcoin, the first major application of blockchain technology. Bitcoin was originally created as a decentralized peer-to-peer electronic cash system.

Only after Bitcoin became widely known did people begin to pay attention to the underlying technology behind it—blockchain. For this reason, decentralization can be seen as the foundational characteristic of blockchain and the core ideal it seeks to achieve.

Another key feature of blockchain is tamper-evidence.

Before any content is recorded on the blockchain, it must go through complex cryptographic processes. In addition, each new block contains information from the previous block, forming a tightly linked structure. This makes unauthorized changes to blockchain data extremely difficult and costly.

This is why blockchain is described as tamper-evident: once data has been written to the blockchain, it cannot be altered without authorization.

Because of this characteristic, blockchain is naturally well suited to many fields, such as public welfare fund supervision, auditing efficiency improvement, copyright protection, healthcare, and academic credential verification in education.

Traceability is also an important characteristic of blockchain.

As mentioned earlier, blockchain uses a block-chain data structure, similar to an interlocked iron chain. Each new link contains information from the previous one, and all on-chain data is connected in chronological order. As a result, any piece of data on the blockchain can be traced back to its origin through this structure.

This traceability has broad practical value. In addition to applications in public services, auditing, copyright protection, healthcare, and academic verification, one particularly important use case is the supply chain.

With blockchain-based traceability, products can be recorded on-chain from the very beginning of production, and subsequent transportation, sales, and regulatory information can also be added to the chain. If a problem occurs, the issue can be traced back to the exact stage where it happened. In this way, incidents such as counterfeit vaccines or contaminated milk powder could be greatly reduced.

Blockchain is characterized by both openness and anonymity. At first glance, these may seem contradictory, but blockchain’s innovation lies precisely in its ability to support both. In fact, both openness and anonymity stem from its fundamental feature: decentralization.

Let us begin with openness.

Because blockchain is decentralized, all network nodes can participate in maintaining data records—except in the case of consortium blockchains and private blockchains. Therefore, its data must remain open. Only through openness can broad participation be ensured, and only through transparency can the security of the data be maintained, making unauthorized tampering far more difficult.

As blockchain technology evolved, Ethereum emerged after Bitcoin. Ethereum is more advanced in some respects because, unlike Bitcoin’s pre-defined transaction system, Ethereum is an open-source and programmable blockchain. In simple terms, Ethereum provides a more complete underlying framework—similar to Android or Apple’s operating systems—on top of which developers can build applications.

For this reason, Ethereum can also be seen as an expression of blockchain’s openness, and in many ways, it represents an upgraded form of that openness.

This is why blockchain is regarded as a highly promising technology. As long as its openness can be fully explored and utilized, blockchain can be applied far beyond Bitcoin’s single-function role as a digital currency service.

The main purpose of openness is to ensure data security. However, beyond protecting data, it is also necessary to protect the rights and interests of participants on the chain—especially the privacy of their transactions. After all, in an open ledger, people should not be forced to reveal all of their personal financial information to everyone on the network.

To address this, blockchain uses cryptographic methods to protect private information while keeping the overall data transparent. This is what is referred to as anonymity.
(Examples include hashing, asymmetric encryption, private keys, and public keys, which are common cryptographic concepts discussed in Bitcoin-related topics.)

Blockchain anonymity first became widely known in connection with the dark web, but its usefulness goes far beyond that context.

In everyday life, anonymity on blockchain can play a major role in protecting personal privacy. A typical example is online shopping.

With blockchain-based anonymity, a seller may know your delivery address, but not necessarily your full identity. In this way, personal privacy can be better protected.

The decentralized nature of blockchain means that there is no centralized authority controlling the system, which gives blockchain a strong democratic character.

This democracy is reflected in the consensus mechanism, which allows all nodes in the network to store and update data freely and securely based on shared rules, voting, and mutual trust.

Voting, trust, and negotiation are all elements closely related to democracy. From this perspective, blockchain democracy has the potential to reshape traditional production relationships. Within a blockchain ecosystem, the power to maintain the system is distributed among nodes rather than concentrated in a single authority. All nodes are treated equally, and through consensus and trust built by participation, they can contribute to the system and receive rewards in return.