Saylor Slams On-Chain Proof-of-Reserves: A Security Risk?
Michael Saylor, MicroStrategy’s executive chairman, recently voiced strong concerns regarding the security implications of on-chain proof-of-reserves for institutions. During a Bitcoin 2025 side event, Saylor declared the common approach to publishing such proofs “a bad idea,” citing significant security vulnerabilities.
He argued that publicly revealing wallet addresses introduces considerable risk, potentially exposing institutions, custodians, exchanges, and investors to increased threats. Saylor remained tight-lipped when questioned about MicroStrategy’s own intentions regarding proof-of-reserves publication.
“The current, conventional way to publish proof of reserves is an insecure proof of reserves. It actually dilutes the security of the issuer, the custodians, the exchanges and the investors. It’s not a good idea, it’s a bad idea.”
While acknowledging the lessons learned from the collapses of FTX and Mt. Gox, Saylor emphasized that proof-of-reserves alone is insufficient. He highlighted the critical oversight of neglecting liabilities in the equation, stating that such proofs only depict a partial picture of an institution’s financial status.
“No institutional-grade or enterprise security analyst would think it’s a good idea to publish all of the wallet addresses, such that you could be traced back and forth.”
He further illustrated his point by suggesting a hypothetical exercise: feeding the question of security risks associated with publishing wallet addresses into an AI. The result, he claimed, would be a comprehensive report detailing numerous security vulnerabilities.
The Post-FTX Shift Towards Transparency
The collapse of FTX prompted widespread adoption of proof-of-reserves by various players in the crypto space, including exchanges, custodians, and ETF issuers. This move aimed to enhance transparency and assure users that sufficient reserves were held to cover deposits. Notable adopters include Binance, Kraken, OKX, and Bitwise.
However, as Saylor points out, the common practice of only showcasing assets without disclosing liabilities presents an incomplete and potentially misleading representation of financial health.
MicroStrategy, the world’s largest corporate Bitcoin holder, according to BitcoinTreasuries.NET, holds over 576,000 BTC. This underscores the weight of Saylor’s opinion within the industry. His critical stance on current proof-of-reserve methodologies raises vital questions about the true effectiveness and security implications of this widely adopted practice.