Check if a SHA-1 hash appears in the Have I Been Pwned (HIBP) breach dataset using k-anonymity (only a 5-character prefix is sent to HIBP, the full hash never leaves this tool). This is a read-only lookup — no data is stored, no files are accessed, no system state is modified. Input must be a 40-char hex SHA-1 digest. Returns JSON with fields: found (boolean) and count (number of breach appearances). A count of 0 means the hash has not been seen in any known breaches.
Connector