suresh To ensure data integrity and security, a blockchain utilizes cryptographic techniques and a decentralized network structure.
Firstly, each block in a blockchain contains a unique hash value calculated based on the data within the block and the hash of the previous block. This makes it almost impossible to alter the data in a block without changing all subsequent blocks, which is extremely difficult due to the computational power required.
Secondly, the decentralized nature of a blockchain means that the data is distributed and verified by multiple nodes in the network. This consensus mechanism ensures that any fraudulent or malicious activity is quickly identified and corrected by the majority of the network, making it highly secure against attacks.
In summary, blockchain technology ensures data integrity and security through the use of cryptographic hashing, immutability of data, and a decentralized network consensus mechanism.
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