Michael Saylor challenged the concept of on-chain proof of reserves at the Bitcoin 2025 conference, emphasizing its drawbacks.Saylor argued that the current implementations of proof of reserves are risky and do not provide a complete picture of solvency.He likened publishing institutional wallets to sharing personal and vulnerable information, making them susceptible to various threats.Saylor highlighted that assets without considering liabilities are insufficient for institutional investors to assess risk.He proposed a standard involving auditor attestation and stringent financial practices to ensure transparency and security.Saylor emphasized the importance of regulatory compliance and rigorous financial reporting to build trust with investors.He acknowledged the theoretical possibility of implementing proof of reserves using zero-knowledge proof in the future.Saylor advised against relying solely on on-chain data and stressed the significance of counterparty discipline in the cryptocurrency space.He underlined the necessity for proper governance and security measures in handling corporate treasuries holding Bitcoin.Saylor's approach prioritizes financial standards and transparency over on-chain proof of reserves in the context of institutional investment.