Block On-Chain Bitcoin Proof-of-Reserves

Key Takeaways

• Block has launched a proof-of-reserves feature allowing users to verify its 8,883 $BTC ($681 million) stash via on-chain signatures.

• The transparency measure covers Block’s corporate treasury, Cash App, and Square, setting a new standard for fintech giants.

• While Jack Dorsey advocates for public verification, MicroStrategy’s Michael Saylor maintains that proof-of-reserves is a “bad idea” that compromises security.

In a move designed to eliminate the need for “blind trust” in corporate custody, Jack Dorsey’s Block has officially launched a proof-of-reserves (PoR) system. By providing on-chain signatures, the company now allows anyone to independently confirm that its Bitcoin holdings are exactly as stated on the balance sheet.

This initiative is a direct response to the industry-wide demand for transparency that followed the 2022 collapse of major centralized entities, emphasizing that reserves should be “actively controlled” rather than merely reported on paper.

Dorsey’s Block Implements On-Chain Verification for Bitcoin Treasury

The rollout, announced in Las Vegas, is comprehensive. It covers not just the corporate treasury—which holds the 14th-largest Bitcoin stash in the world—but also the retail-facing Cash App and Square platforms. Block’s commitment to transparency is coupled with a push for mainstream utility; the company simultaneously launched a touchscreen Bitkey hardware wallet and increased Bitcoin withdrawal limits to $10,000 per day.

By enabling payments to be automatically converted into Bitcoin and offering 5% $BTC cashback, Block is positioning itself as the premier bridge between traditional fiat and the Satoshi-inspired vision of peer-to-peer cash.

Saylor and Strategy Remain Skeptical of Public Reserve Disclosures

Despite the move by Block, the corporate Bitcoin world remains divided. Michael Saylor of MicroStrategy (Strategy), the largest corporate holder of $BTC, has doubled down on his opposition to public proof-of-reserves. Saylor argues that such disclosures “dilute the security” of issuers and custodians by exposing sensitive information to potential attackers.

This creates a fascinating ideological split in 2026: Dorsey’s camp prioritizes user-side verification and transparency, while Saylor’s camp prioritizes hardened security through obfuscation. As more companies add Bitcoin to their treasuries, the industry will likely have to choose between these two distinct philosophies.

Final Thoughts

Block’s move toward radical transparency sets a high bar for publicly traded companies. Whether “Don’t Trust, Verify” becomes the corporate gold standard depends on whether other giants follow Dorsey’s lead or Saylor’s caution.

Frequently Asked Questions

What is Proof-of-Reserves?
It is a technical method using on-chain signatures to prove a company actually holds the assets it claims to have.

How much Bitcoin does Block hold?
As of the latest report, Block holds 8,883 $BTC, valued at approximately $681.4 million.

Why does Michael Saylor oppose it?
He believes it creates a security risk by providing too much information to potential hackers or bad actors.