Pindrop is a fraud prevention and authentication tool that's now being used in three out of the top four banks. The company has spent the last five years building up a digital library of audio traits that can pinpoint where and what kind of call is coming through. If the service or the geography seems like an anomaly, or if it looks like the same kind of phone print that it's picked up over and over again, then Pindrop can flag the call as a possible risk.
Source: Tech Insider
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