Re:Trust is good, control is better: Reproducible builds at ...
by Boulth on Sunday July 21, 2019 @03:05AM
(#20490292)
Yes, F Droid builds it itself. Then compares with your build minus the signature. If it's the same it publishes with your signature. No need for any private key handling.
AFAIK it should work that way but I couldn't tell from the diagram and skimming the text.