They already know who you are. They typed your email address in themselves when they named you on the record. Answering does not tell them anything about you that they did not already know.
What the person who asked sees
That you answered, and when.
Which answer you gave.
If you declined: the reason you picked, if you picked one, and anything you typed. A reason is optional.
If you corrected a detail: what you changed it from and to, and any note you added.
They do not get told why a confirmation did or did not count as independent evidence. They may be able to see that an outcome was recorded but not counted. Neither of you is told which check applied.
If you picked a relationship, such as client or manager, it is never displayed next to a single record for anyone, including them. It only ever reaches a reader as part of an overall mix.
What a stranger reading their record sees
Their record is not public unless they turn it on, and it is off by default for every account. If they have turned it on:
The record can list the agreement itself, including the name they entered for the other side. That may be your name, or your business's name, depending on what they typed. A shopfitter's record might show "Whitcombe Road Newsagents" against the job.
Your email address never appears. It is on the explicit list of fields that cannot be included in anything served to a counterparty or on a public page.
Your reason for declining, anything you typed with it, and any note you added to a correction never appear on the public page either. Those go to the person, not to the world.
If they share their score through a Credda link rather than their public page, a reader sees how many separate parties have confirmed things, and never who. No part of that payload names a confirmer.
What nobody sees
There is no page anywhere on Credda that lists who confirmed what for whom.
Answering does not create an account, a profile or an entry for you. If you later start a record of your own, it is unpublished until you publish it.
Credda holds no register of customers, no no-show list and no blacklist of any kind, so your answer cannot end up on one.
Does my answer give them a score
Only indirectly, and not in a way you control.
The score is a formula applied to the record. No person and no AI adjusts it, and there is no number for you to set. A confirmation that counts as independent evidence is one input among several. A confirmation that is recorded but does not count is not.
Two things worth knowing, because people assume the opposite:
Confirming an education record, a certificate, a skill, a project or an award does not move anybody's score at all. Those are recordable and displayable, and they are not inputs. If a registrar confirms someone attended, that is a true fact on the record and it is worth nothing to the number.
Declining moves nothing either. Not down, not at all.
One limit worth naming
If you confirm that someone holds a license number, Credda does not show that as checked with the issuing board, because you are not the board and you did not look it up in its register. You confirmed what you saw. In the trades and in healthcare that difference matters, so the product refuses to display it as a tick.