Using the UC online journal may not be mandatory

DWP wrote:
Work search activities

Work search activities can be:  
  required – with failure to carry out those activities resulting in a potential reduction
in the payment of Universal Credit  
  voluntary – with no reduction in the payment of Universal Credit if these specific
activities are not carried out (but see Expected hours)  

There are two sub-categories of work search activity. A general requirement to take all
reasonable action and particular, specific actions accepted on the Claimant
Commitment.  
All work searches should be for the purpose of obtaining paid work, more paid work or
better-paid work. Work search activities include:  
  carrying out work searches  
  making applications  
  creating and maintaining an online history  
  registering with an employment agency  
  seeking references  
  any other actions  

Evidence
A claimant has to provide information and / or evidence if requested in order to show they are
able to comply with the rules relating to work-related requirements.