The consensus mechanism used by Ethereum after The Merge is called Proof of ________.
- Interdisciplinary Cyber Physical Systems / NM-ICPS
- Stake / PoS
- Ransomware
- Closed-loop / Feedback
Answer: Stake / PoS
Ethereum transitioned from Proof of Work to Proof of Stake (The Merge, 2022), reducing energy consumption by ~99.95%. Validators stake ETH to propose/attest blocks. Critical for understanding crypto sustainability.