Block, the payments company formerly known as Square, has released a free AI-powered vulnerability scanner called Loupe aimed at Bitcoin developers. The tool is designed to spot security flaws in Bitcoin-related code without requiring a dedicated security team — a resource many small projects lack. Loupe is available immediately, and Block is positioning it as a way to democratize security for the Bitcoin ecosystem.
What Loupe does
Loupe scans Bitcoin codebases for common vulnerabilities, using an AI model trained on known Bitcoin-specific bugs. The scanner runs locally, meaning developers don’t have to upload code to a third-party server. That privacy feature is a deliberate choice — many open-source projects are wary of exposing unreviewed code to external services. Block says the tool is free and will remain so, with no subscription or usage limits.
Why Bitcoin projects need it
Bitcoin’s development community is fragmented, with thousands of independent projects building wallets, payment processors, and layer-2 tools. A single missed vulnerability in one project can ripple across wallets or exchanges that integrate it. Smaller teams often can’t afford a dedicated security auditor or static analysis tools. Loupe doesn’t replace a full audit, but it gives those teams a cheap first pass that catches obvious problems before they go live.
Block’s long play in Bitcoin
Block has been building Bitcoin infrastructure for years — from the Cash App’s BTC trading feature to its open-source Spiral development arm. Loupe fits a pattern: the company puts out free tools that improve the broader Bitcoin ecosystem while keeping its own product roadmaps private. It’s not the first security tool Block has backed, but it’s the first one aimed directly at developers rather than end users.
Availability
Loupe is open-source and hosted on GitHub under a permissive license. Developers can download and run it against their own repositories. Block hasn’t announced any integration partners or a timeline for updates, but the code is live, and the company says it welcomes contributions from the community.
