To choose the correct statement about blockchain. Let's evaluate each option:

The question asks to choose the correct statement about blockchain. Let's evaluate each option:

• Blocks in a blockchain are linked to each other via hashes: This statement is correct. Each block in a blockchain contains a cryptographic hash of the previous block, which creates a secure and immutable chain of blocks.
• A blockchain requires a central server-node to function: This statement is incorrect. Blockchain technology is fundamentally decentralized, meaning it operates without a central authority or server.
• Blockchain is always decentralized: This statement is incorrect. While many public blockchains are decentralized, there are also private or permissioned blockchains that can be centralized or semi-decentralized.
• The largest participant can change the information in a blockchain: This statement is incorrect. The design of a blockchain, especially public ones, makes it extremely difficult for any single participant, regardless of size, to alter past information due to the cryptographic linking and consensus mechanisms.

Therefore, the first statement is the correct one.

The correct statement is:

• Blocks in a blockchain are linked to each other via hashes