The function of blockchain is to share the database, which has the characteristics of decentralization, openness, independence, security and anonymity.

1, decentralization.

Blockchain technology does not rely on additional third-party management institutions or hardware facilities, and there is no central control. In addition to the self-contained blockchain itself, each node realizes self-checking, transmission and management of information through distributed charging and storage. Decentralization is the most prominent and basic feature of blockchain.

2. openness.

The technical basis of blockchain is open source. In addition to the encrypted private information of all parties to the transaction, the blockchain data is open to everyone, and anyone can query the blockchain data through the open interface and develop related applications, so the whole system information is highly transparent.

3. independence.

Based on the agreed specifications and protocols (similar to various mathematical algorithms such as hash algorithm adopted by Bitcoin), the whole blockchain system does not depend on other third parties, and all nodes can automatically and securely verify and exchange data in the system without any human intervention.

4. Safety.

As long as all data nodes of 5 1% cannot be controlled, network data cannot be manipulated and modified at will, which makes the blockchain itself relatively safe and avoids subjective and artificial data changes.

5. anonymity.

Unless there is a legal requirement, technically, the identity information of each block node does not need to be disclosed or verified, and the information transmission can be anonymous.

The data or information stored in it has the characteristics of "unforgeability", "leaving traces all the way", "traceability", "openness and transparency" and "collective maintenance". Based on these characteristics, blockchain technology has laid a solid "trust" foundation and created a reliable "cooperation" mechanism, which has broad application prospects.

Extended data:

Type of blockchain:

1, public blockchain

Public blockchain means that any individual or group in the world can send transactions, and transactions can be effectively confirmed by blockchain, and anyone can participate in its knowledge process. Volkswagen blockchain is the earliest blockchain and the most widely used blockchain. Every virtual digital currency of Bitcoin series is based on an open blockchain, and there is only one blockchain in the world corresponding to this currency.

2. Joint (industrial) blockchain

Industry blockchain: a group designates multiple pre-selected nodes as bookkeepers, and the generation of each block is decided by all pre-selected nodes (pre-selected nodes participate in the * * * knowledge process). Other access nodes can participate in the transaction, but don't ask about the billing process (essentially just becoming distributed billing, preselecting the number of nodes, and how to determine the bookkeeper of each block to become the main risk point of the blockchain.

3. Private blockchain

Private blockchain: bookkeeping only uses the general ledger technology of blockchain. It can be a company or an individual, and it has the exclusive right to use the blockchain. This chain is not much different from other distributed storage schemes. Traditional finance wants to experiment with private blockchain, while the application of public chain, such as bitcoin, has been industrialized, and the application products of private chain are still being explored.

References:

Baidu Encyclopedia-Blockchain (Data Structure)