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What is 'Proof of Stake' in Blockchain?

Options are:

1-     A method of proving ownership of cryptocurrencies.

2-     A consensus mechanism where validators are chosen based on the amount of cryptocurrency that they hold and 'stake'. 

3-     A way to prove the authenticity of blockchain.

4-     A technique for staking a claim on newly mined coins.


Correct Answer is:

A consensus mechanism where validators are chosen based on the amount of cryptocurrency that they hold and 'stake'.