Certainty level

CertaintyLevel is the measure of confidence that BlinkID Verify has in the result of a check.

It can be Low, Medium, or High. If a check was not performed, the value is NotPerformed.

"checks": [
  {
    "name": "ExtractedDataCheck",
    "result": "Pass",
    "certaintyLevel": "High",
    "type": "DetailedCheck",

Why certainty varies

Some checks are inherently limited in how certain they can be. For example, a check that flags suspiciously common names can never be fully certain—a document holder could genuinely be named "John Smith". When such checks fail, they never do so with a High certainty level.

Other checks can draw on multiple independent factors. The more of those factors are present and consistent, the higher the certainty level. Conversely, if too few factors are available—for example, because image quality is poor—the certainty level drops.

What to do with a low certainty level

A low certainty level on a failed check is a signal that the result may benefit from human review. If your workflow supports it, route documents with low-certainty failures to manual review rather than rejecting them outright.