What Is “Stake Centralization” and Why Is It a Concern for PoS Security?
Stake centralization occurs when a small number of entities (individuals, exchanges, or staking pools) control a disproportionately large amount of the total staked cryptocurrency. This is a security concern because it lowers the effective cost and coordination difficulty for a 51% attack.
If a few large entities collude or are compromised, they can easily gain a majority stake and manipulate the chain, undermining decentralization.