Are decentralized blockchains immutable?

Question: Are decentralized blockchains immutable?

Decentralized blockchains, also known as distributed ledgers, are designed to be immutable, meaning that once data is recorded on the blockchain, it cannot be altered or deleted. Immutability is achieved through the use of consensus algorithms and cryptographic techniques, such as hashing and digital signatures.

In a decentralized blockchain network, each node maintains a copy of the ledger, and new transactions are added to the ledger through a consensus process. Once a block of transactions is added to the blockchain, it is very difficult to alter or delete, as doing so would require the consensus of the majority of nodes on the network. Additionally, each block in the blockchain is linked to the previous block through a cryptographic hash, making it virtually impossible to tamper with the data without being detected.

However, it is important to note that the immutability of a decentralized blockchain does not mean it is totally invulnerable. There are known attacks that can happen in a blockchain network, such as 51% attack, sybil attack, double spending, and others. These attacks can compromise the security and integrity of the blockchain network.

In summary, decentralized blockchains are designed to be immutable, but this immutability is not guaranteed and can be affected by certain types of attacks.

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