Question

question 5 of 10
how does a block of data on a blockchain get locked?
it gets double - checked by the people with access to the public ledger.
the goverment reviews and verifies all blocks of data.
financial institutions review all blocks of data related to cryptocurrency.
blocks of data are locked since they are unalterable.

Explanation:

Blockchain is decentralized. The government (centralized entity) doesn't review all data blocks in a typical blockchain (like Bitcoin blockchain). Financial institutions also don't have the role of reviewing all cryptocurrency - related data blocks in a decentralized blockchain. And the statement "Blocks of data are locked since they are unalterable" is a circular argument. In a blockchain, when new transactions are added to a block, miners (or nodes in some consensus mechanisms) validate the transactions. Once a block is added to the blockchain (after being validated by the network of nodes with access to the public ledger), it is considered locked.

Answer:

It gets double - checked by the people with access to the public ledger.