I have a doubt regarding blockchain. I understand how it works, but couldnot make use of it.

I am currently working on a platform which let client to assign task to their employee

Now I am planning to make use of blockchain on existing platform, to somehow set up a mechanism to authenticate that employee had completed the task, as a certification to the employee. I just cannot figure out how

I thought of an implementation, ( if its possible ) where client will trigger the smart contract with some employee-specific data, and the smart contract will generate a custom token, which will then be sent to the employee's account. This token will be non transferable