While there are some demand partners currently decisioning spend based on ads.txt, it is by no means fully adopted on the buy side and is not likely the reason why impressions stopped serving on your blogspot page, if they stopped serving completely. I will be glad to help you troubleshoot this issue. There is no username associated with this email, so I unfortunately was not able to reference your account for further info.
Can you provide your username so I can look into this further? Feel free to message me directly.
@brady.moritz Thanks for the relevant info, that is very helpful for anyone using Blogger who wants more info regarding their ads.txt or monetization.