I do not use the zap store Obtanium. you need to contact the dev to get the hash. but mostly thats a PITA so I'm just trusting their github.
thanks. zap store has a little section when you select a specific application and gives more details to verify those hashes and from what I've seen many have the checksums in that place. I just can't find the dang apk to confirm it 😂😂😂 but it does also have the social "verification" aspect.