Proof of Stake (PoS)

Proof of Stake (PoS) It's a distributed consensus mechanism used in blockchains to validate blocks and secure the network, where the right to participate as validator is assigned based on the amount of locked tokens (“stake”) for each node. Unlike Proof of Work (PoW), which requires large amounts of computational power and energy, PoS is based on economic incentives and digital signature cryptography to achieve consensus among network participants.

In PoS, validators are selected pseudorandomily, weighted by the amount of cryptocurrencies they are staking. This process includes penalties such as Slashing for misbehavior (e.g. double validation or inactivity) and rewards in the form of newly issued tokens or transaction fees. This allows the network to be kept secure without the need for hardware-intensive block mining.

PoS has multiple variants implemented in networks such as:

• Ethereum (after The Merge): Pure PoS with slashing and selection using the RANDAO algorithm.
• Polkadot/Cosmos: NPoS (Nominated PoS) or DPoS (Delegated PoS) model, where users can delegate their stake to validators.
• Cardano/Tezos: they use adaptive PoS with integrated governance.

In addition to improving the energy efficiency and scalability, PoS allows for more inclusive and sustainable network designs, opening the door to on-chain governance mechanisms, greater economic decentralization and reduction of entry barriers for block validation.