Getting the trinity-keyring in Devuan can be tricky, I had to learn a system that worked, First of course is to do the Devuan base install and then boot and login and do apt-get update and 'apt-get install trinity-keyring --allow-unauthenticated', now you can apt-get install tde-trinity, you will have to tell apt 'y' for yes when asked to install untrusted. After the install is done and you boot to the trinity desktop you can copy the trinity-keyring and run 'apt-key adv --keyserver keyserver.quickbuild.io --recv-keys (paste the trinity-keyring here)' and your good to go. If you try to have a system without the keyring properly installed you are going to have system problems, so make sure you can install aptitude and can run aptitude dist-upgrade without problems.
Cheers!