trust levels used during signing represent quality of identity check. in simple terms: if you checked ID of the person that is "sig3", if guy just claims the na

trust levels used during signing represent quality of identity check. in simple terms: if you checked ID of the person that is "sig3", if guy just claims the name on internet than it's "sig1" on the other hand, "owner trust" is a local concept which is not exported and used solely for trust-path verification