Each red flag is derived deterministically from a public USPTO record, computed point-in-time (as of the record's date, no look-ahead), and carries a rule version, a confidence score, an evidence hash, and an Ed25519 signature verifiable at /v1/pubkey.
Fires when a recorded patent assignment's conveyance is a security interest (patents pledged as loan collateral). Releases and terminations are excluded. The flagged entity is the assignor (the patent owner granting the pledge).
Fires when a plain assignment transfers a large block of patents out in one recordation (sale / M&A / distress). Quarantined to review before publication.
Fields are descriptive, never conclusive. A recorded filing is a fact, not a judgment about the entity, its patents, or its securities.