The reason opting in twice feels safer than once

Confirm your email address, then click the link in the email to confirm again. The second step tests nothing the first did not, unless the address was mistyped. What it produces is an artefact: a two-stage trail showing that consent was obtained deliberately, which is exactly what will be needed if it is ever questioned.

What everyone sees

Double confirmation is presented as protecting the user from error, and sometimes it does catch typos. That benefit is narrow and the practice is broad, applied to decisions where no error is possible. The additional step is doing work for the organisation rather than for the person clicking.

What is actually happening

Feldman and March argued that organisations gather more information than they use because information functions as a signal of competence and legitimacy, with the act of collection serving to demonstrate that a decision was properly made rather than to improve it. Tetlock’s work on accountability shows the mechanism from the individual side: people held accountable for their process, rather than for outcomes, adopt strategies that are defensible to observers, which favours visible thoroughness over accuracy. A redundant confirmation step is the interface expression of both findings. It generates evidence of diligence, that evidence is durable and auditable, and the decision it certifies is unchanged.

Why it stays hidden

The purpose hides because the user experiences the reassurance the step was designed to document. Being asked twice feels like being taken seriously, so the artefact’s intended audience — an auditor, a regulator, a court — never comes to mind. Both parties get something, and only one of them gets the thing the step exists for.