When zap.store is ready i'll change the keys and start publishing the hashes
For now you can check if Amber is signed with the key 56dc631996a55c2284790448c7dc9f1dd05df596b2ce4882313633f5602e5fe4 and try to check if the apk is reproducible by building it and see if it matches the content inside the apk
The best way of doing this i found was adapting the signal docker file
https://github.com/signalapp/Signal-Android/tree/main/reproducible-builds
If you dont want to do this its better to wait for when i start signing with my new keys in zap.store