Jack Dorsey's Block enables onchain proof-of-reserves for 8,883 BTC holdings across treasury, Cash App and Square, allowing users to independently verify balances via cryptographic signatures

Block, the Jack Dorsey-led payments company behind Cash App and Square, has launched a public proof-of-reserves system for its Bitcoin holdings, letting anyone verify its reported balances using cryptographic signatures. The company says the dashboard covers Bitcoin held across its corporate treasury, Cash App, and Square, and is meant to show that the reserves are actively controlled rather than only captured in a past snapshot. The immediate context is the broader post-FTX push for reserve transparency, as crypto firms have faced pressure to prove custody of customer and corporate assets. Block’s published materials say users can independently verify wallet ownership and audit results on-chain, while reporting around the launch places the disclosed holdings at roughly 8,883 BTC in the treasury-focused disclosure and more broadly in the tens of thousands of BTC when customer-related balances are included in some recent reports. The story matters because Block is a large public company using consumer-facing products to normalize verifiable Bitcoin custody, but some industry figures argue proof-of-reserves can create security risks by exposing sensitive wallet information.

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