What does blockchain cid mean?

CID (Content Identifier) ​​is a hash value used to uniquely identify data in the blockchain. It has the functions of data integrity verification, data retrieval and data sharing. CID is generated by applying a hash function to the data. Its format consists of version number, decoder encoding and encoded data. It is widely used in blockchain projects such as Filecoin, IPFS and Ethereum.

Detailed explanation of blockchain CID

What is CID?

CID (Content Identifier) ​​is a unique identifier used to identify specific data in the blockchain. It is a hash value, generated by a specific algorithm, that provides a one-way mapping of given data.

The role of CID

CID plays a vital role in the blockchain, including:

• Data integrity verification: CID can be used to verify the integrity of the data, because any verification of the data Modifications will result in different CIDs.
• Data retrieval: CID can be used to retrieve data from the blockchain network, similar to using URLs in the HTTP protocol.
• Data Sharing: CID can be easily shared between different parties, enabling distributed storage and retrieval of data. Generation of

CID

CID is generated by applying a hash function to the data. Common hash functions include SHA-256, BLAKE2b, etc. A hash function converts data into a fixed-length hash value that uniquely identifies the data.

Format of CID

The format of CID is defined by the Internet Engineering Task Force (IETF). It consists of the following parts:

• Version Number: Identifies the version of the CID.
• Decoder Encoding: Identifies the decoder type used to decode the CID.
• Encoded Data: After decoding, the original data will be returned.

Applications of CID

CID has been widely used in various blockchain projects, including:

• Filecoin: used to identify files stored on the Filecoin network.
• IPFS: Used to identify data stored in the IPFS network.
• Ethereum: Used to identify smart contract code stored on the Ethereum blockchain.

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