The present disclosure describes a computer-implemented platform for managing electronic instruments and electronic endorser verification information in order to validate endorser identity. A generated link and a verification information request are sent in one or more messages targeted a phone number of a computing device associated with a target party. The verification information request includes a request for imagery of the target party captured by the computing device. An endorsed electronic instrument and electronic verification information is received from the computing device, including received imagery data and a time stamp indicating when the received imagery data was captured. The received imagery data is validated at least according to whether the time stamp is sufficiently recent, and whether the received imagery data sufficiently matches expected imagery data of the requesting party based on performing a facial recognition on the received imagery data and the expected imagery data.