Most companies find out they were breached the same way the public does - after a ransomware gang has already posted it. Checking a leak site by hand isn't really a workflow; by the time someone thinks to look, the disclosure is already public.
Real number, verified at the source: 7,307 companies were listed on ransomware leak sites in 2025, up 45% year over year, across 138 active groups. That's roughly 20 companies disclosed every day, continuously, not in bursts.
Dark Web Breach Sentinel takes a watchlist - company names or domains - and checks it against newly disclosed ransomware and breach victims on a schedule, via ransomware.live's open threat-intel feed. It reports only what's new since the last check. The first run on any watchlist entry establishes a silent baseline; nothing already-known gets replayed as if it just happened.
Bug found in production, not local: Apify's key-value storage rejects keys containing spaces. Local tests never enforced that, so a watchlist entry like "Real Estate" broke silently until it hit production. Fixed by hashing the keyword instead of trying to sanitize it - guarantees a valid storage key no matter what a client types in.
https://apify.com/0xgollum/dark-web-breach-sentinel
Source: Breachsense 2025 Ransomware Report (https://www.breachsense.com/ransomware-reports/annual-report-2025/)
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