Introduction
At the Bitcoin 2025 conference, Michael Saylor, Executive Chairman of Strategy (formerly MicroStrategy), took a critical stance on the widely endorsed practice of on-chain proof-of-reserves (PoR). Contrary to expectations, Saylor argued that current PoR implementations pose significant security risks and fail to provide a complete picture of an entity’s financial health.
The Security Risks of Public Wallet Disclosures
Saylor likened the publication of institutional wallet addresses to sharing sensitive personal information, stating, “Publishing institutional wallets resembles publishing the address and the bank accounts of all your kids and the phone numbers of all your kids and then thinking somehow that makes your family better.” He indicated that this kind of transparency can act as an “attack vector for hackers, nation-state actors, every troll class of person.” When organizations disclose wallet addresses, they risk exposing themselves without realizing it. Their adversaries can see their transactions, will have their treasury movements, and they can rely on other vulnerabilities, which may expose custodians, exchanges and investors.
The Partial Transparency of Proof-of-Reserves
Besides the security implications of exposing themselves to the public, Saylor mentioned what he viewed as a significant flaw in the PoR model as only have information on their assets, while ignoring their liabilities. He then proceeded to highlight the ridiculousness of claiming to have large amounts of bitcoin when you have liabilities, asking, “So you’ve got $63 billion of bitcoin – you got a hundred billion of liabilities?”
Transparency for corporates means reporting both assets and liabilities. Stakeholders need both to assess the solvency or financial stability of the organization.
For Institutional-Grade Transparency
Saylor began with a different proposal, rooted in traditional financial auditing practices. Saylor’s recommendation for all corporates was to engage Big Four auditors to verify holdings in Bitcoin and to assure that the corporate’s assets had not been rehypothecated or pledged to other counterparties. This level of transparency would require all of the checks and balances that go along with a big four audit, including certifications by CFO’s, CEO’s and board of directors who will be personally held accountable civilly and criminally for the company’s misrepresentations. He emphasized that such a system would provide a more accurate and secure representation of an entity’s financial standing, aligning with established corporate governance standards.
Potential for Future Innovations
While critical of current PoR practices, Saylor acknowledged the potential for future solutions that address existing shortcomings. He expressed openness to implementing a PoR system utilizing zero-knowledge proofs, which could verify holdings without revealing specific wallet addresses. However, he noted that such a system would still require comprehensive governance measures, including approvals from custodians, exchanges, auditors, risk managers, and corporate officers.
Conclusion
Michael Saylor’s critique at Bitcoin 2025 underscores the need for more robust and secure methods of demonstrating financial transparency within the cryptocurrency industry. By advocating for institutional-grade auditing over public wallet disclosures, he calls for a shift towards practices that prioritize both security and comprehensive financial reporting. As the industry evolves, integrating traditional financial standards may prove essential in building trust and ensuring long-term stability.
