In general, embodiments of the present invention provide systems, methods and computer readable media for providing a user verification service based on analyzing digital fingerprint signals derived from out-of-band data (i.e., data not directly supplied by the user). In some embodiments, a digital fingerprint engine embedded in an app hosted on a client device being accessed by a user reads various device or user data and then creates a set of encoded user verification data representing out-of-band data stored locally on that device. In some embodiments, the user verification data are encoded as hashes generated by a hash function. In some embodiments, the app is configured to contact a business server via the cloud, and the set of digital fingerprints are included in an authorization request transmitted from the client device to the business server. In some embodiments, a digital fingerprint verification service verifies the set of digital fingerprints by determining whether they match any of a stored set of digital fingerprints representing a group of previously verified users.