Ethereum co-founder Vitalik Buterin has proposed zero-knowledge (ZK) payments as the new standard for cryptocurrency transactions, aiming to enhance privacy and drive mass adoption. In a recent research article, Buterin emphasized the need to transition from "pseudonymity" to "privacy by default" in crypto payments, particularly in the emerging "agent era." He argues that the transparent nature of blockchains is a significant barrier to replacing traditional fiat systems, advocating for ZK-proof-based transactions that validate payments without exposing users' balances or transaction histories. Buterin's proposal includes using Ethereum Layer 2 solutions to facilitate privacy-preserving payments with the same efficiency as transparent transactions, employing technologies like "recursive SNARKs" and "ZK API usage credits." The initiative also introduces "selective disclosure" and "proof of innocence" mechanisms, allowing users to provide compliance proofs to authorities without public data exposure. This approach aims to attract enterprises and institutions concerned about privacy, offering instant settlement, low fees, and confidentiality akin to traditional banking. As these standards become default on Ethereum's Layer 2 networks, the platform is poised to become a secure, private financial layer for global users.