No, it’s not possible to modify the data in a block. In case any modification is required, you would have to erase the information from all other associated blocks too.

In a typical blockchain, once a block is added to the chain, its data is considered immutable. The cryptographic hash of each block is dependent on its content, including the hash of the previous block. If someone attempts to modify the data in a block, it will result in a change in the block’s hash. This, in turn, would require the modification of subsequent blocks’ hashes, creating a chain reaction throughout the blockchain.

The consensus mechanism of the blockchain network, whether it’s Proof of Work (PoW), Proof of Stake (PoS), or another protocol, relies on the integrity and immutability of the blockchain. Attempting to modify a block’s data is extremely challenging and would require significant computational power and resources. In a well-designed and secure blockchain, modifying the data in a block is practically impossible without consensus from the majority of the network participants.