Methods, apparatus, and processor-readable storage media for user-controlled transaction tagging to enable easier identification and co-relation of subsequent related events are provided herein. An example computer-implemented method includes receiving, via a first user device in connection with a request to access a protected resource, a first set of user-generated cryptographic information and a second set of user-generated cryptographic information; generating and outputting an authentication request to a second user device in response to processing the first set of user-generated cryptographic information against a stored set of cryptographic information associated with the protected resource, wherein the authentication request causes the second set of user-generated cryptographic information to be rendered via the second user device; and resolving the authentication request in response to receiving, via the second user device, an indication to grant or deny the request to access the protected resource via the first user device.