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I thought maybe confirmer or confirmator would work, but confirmer is not an english word and the "ator" suffix only applies to words ending in "ate" (source). The closest noun I can think of is "validator", which is a synonym of confirm. However I was hoping there was a noun form of confirm itself.

For example, "the confirmator was broken, and clients were unable to establish the requests were submitted".

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    'Clincher' (A fact, argument, or event that settles a matter conclusively): Lexico certainly fits well with the title question. It's rather informal. But don't you just want 'guarantee' or a synonym for your example sentence? Or is it 'validating mechanism'?
    – Edwin Ashworth
    Commented Mar 22, 2020 at 17:56
  • I was thinking more along the lines of validating mechanism.
    – Justin Raymond
    Commented Mar 22, 2020 at 18:56
  • Looking at the example sentence, perhaps "The automatic acknowledgement was broken, ..."
    – Weather Vane
    Commented Mar 22, 2020 at 20:26
  • @JustinRaymond How about "validator" then? It's already used to describe various kinds of syntax checkers.
    – user888379
    Commented Mar 22, 2020 at 22:05
  • Or you could use authenticator, because what you are doing sounds very much like authentication.
    – Robusto
    Commented Mar 23, 2020 at 1:12

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Is the answer not confirmation. It is certainly "that which confirms".

It also works with your example sentence: The confirmation was broken, and clients were unable to establish the requests were submitted.

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  • It just occurred to me that with one letter change "confirmation" can turn into "confirmatron", which is obviously a machine that confirms :)
    – user888379
    Commented Mar 22, 2020 at 23:03
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Word Hippo has

confirmator
One who, or that which, confirms; a confirmer.

and

confirmer
One who confirms something

along with lots of others, like

confirmee
A person who is confirmed via religious rite.

and

confirmand
A candidate for confirmation or affirmation of baptism.

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