That message corresponds to errSecCSInvalidObjectRef (-67071). That’s an obscure one. I’ve been supporting Mac coded signing for almost a decade and I’ve never seen it before. Well done! [quote='818406021, hasii2021, /thread/818406, /profile/hasii2021'] Can't figure out how to post the log file. [/quote] You can post log files as text attachments. I have info on how to do that in Posting a Crash Report. Its focus is on crash reports, but the process for posting a text attachment is the same in both cases. However, the notary log is unlikely to help here because, as you say, the app notarises successfully. Rather, this is a code signing error on your local Mac. [quote='818406021, hasii2021, /thread/818406, /profile/hasii2021'] when I try to verify the signature I get the above error. [/quote] How are you doing that? Normally I’d verify a signature like so: % codesign -v --deep --strict /path/to/my.app Is that what you’re doing? As to the potential causes of errSecCSInvalidObjectRef, there are very few. Most of