What a ten-minute check caught that the ad review didn't

What this step is

Blind-verifying every launch is step 52 (Part VIII), marked easy difficulty, almost nobody does this, with manual tooling (it genuinely needs a second person, not automation). The gap between easy and almost-nobody is the whole finding here.

The seven-point blind check

Run through a checkout with a real payment before reading the copy. View the preview, not the editor, since the reader sees the preview and not the intention behind it. Confirm every link carries its tracking parameters. Confirm the destination loads, on a phone too. Confirm the offer matches: the same price on the ad and on the page. Confirm the budget is set per day, not lifetime. Confirm every claim describes the product rather than an assumed failure in the reader.

What it actually caught

The first time this check ran, it caught a word that had come apart into characters that weren't letters, invisible to a normal proofread, and a set of links that had dropped their tracking parameters entirely, a fault that would have made every sale from that launch un-creditable to any campaign.

Why it has to be someone else

A guideline like this erodes within a month on its own, and there's always a good reason to slip one more creative in without review. The checker has to be someone who didn't build the launch, because the builder's own blind spots are exactly what the check exists to catch.

Where it breaks

Letting the person who built the launch also be the one who blind-checks it. Skipping the check on a launch that feels routine, which is also the launch least likely to get a second look otherwise.

A checker who only reads the copy and skips the checkout step misses exactly the class of fault (a dropped tracking parameter, a broken link) that costs the most once real spend is behind it, which is why the seven-point list above includes a real payment, not just a read-through.