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Polkadot Proof of Concept 4 arrives with new ways to stake In April, Polkadot’s Alexander testnet underwent a successful runtime upgrade that adds new features to the Polkadot relay chain. Proof-of-Concept 4 is here and comes with new staking features that make running a validator on Polkadot much more secure and customizable. Staking A healthy proof-of-stake system needs a high number of validators and a large percentage of capital locked up in staking to secure the network. Proof-of-Concep