Could you please elaborate on the total supply of Ethereum Proof of Work (PoW)? I'm curious to know if there's a fixed or variable limit on the amount of Ethereum tokens that can be mined under the PoW consensus mechanism. Understanding the total supply is crucial for investors and analysts alike, as it provides insights into the potential scarcity or inflation of the currency. Additionally, is there any planned transition from PoW to another consensus mechanism that could affect the total supply? Thank you for clarifying this matter.