Currently, we have two separate contract repositories: shutter-network/shop-contracts and shutter-network/gnosh-contracts. We should merge them into one (e.g. shutter-network/contracts) and get rid of unused contracts. In particular:

• shop-contracts:
  • KeyperSetManager, KeyperSet, KeyBroadcast and EonKeyPublish is used in both the SHOP and the GNOSH implementation
  • Inbox is used in the SHOP implementation
• gnosh-contracts:
  • KeyperSetManager, KeyperSet, KeyBroadcast and EonKeyPublish are unused and can be removed
  • Sequencer and ValidatorRegistry are used in the GNOSH implementation
  • The interfaces IKeyperSetManager, IKeyperSet, IKeybroadcast, IValidatorRegistry and ISequencer are references to the GNOSH spec and should be preserved
• We have tests and scripts in both repositories. There is a probably a lot of overlap that we only need to preserve once. For the scripts, we should especially have two separate deploy scripts for shop and gnosh as well as a script to add a new keyper set.
• The two repos have automatically generated go bindings that are used as dependencies in rolling-shutter and other repos. They get generated in slightly different ways (see gen/gen.go in shop-contracts and gen_bindings.sh in gnosh-contracts). I personally prefer the latter, but others may disagree. We should end up with either a single or two separate packages. A single is probably preferable for simplicity.
• In shop-contracts there's some predeploy code that probably should be preserved, but I'm not entirely sure if we still need it.