Proof of Authority (PoA) and Proof of Stake (PoS)

Nhan Cao
3 min readOct 27, 2024
Proof of Authority (PoA) and Proof of Stake (PoS)

Proof of Authority (PoA)

  • Validation Mechanism: Validators are pre-approved, trusted entities based on authority.
  • Validator Selection: Limited; validators are selected by a central authority or consensus.
  • Network Type: Primarily used in private or consortium networks.
  • Energy Efficiency: Highly efficient as it doesn’t require mining.
  • Security Model: Relies on validator reputation and trust.
  • Fault Tolerance: Byzantine Fault Tolerant (BFT), though less decentralized.
  • Scalability: High scalability, as a limited number of validators handle consensus.
  • Decentralization: Lower due to a smaller, centrally approved set of validators.
  • Governance: Usually centralized, as the validator set is controlled by a central authority.
  • Transaction Finality: Immediate or near-instant finality.
  • Risk of Centralization: High, as the validator set is often small.

Proof of Stake (PoS)

  • Validation Mechanism: Validators lock up tokens as collateral (stakes).
  • Validator Selection: Open to any user who meets staking requirements.

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