Get a hash of model and its linked subystems

I'm looking for a way to make a hash of a Simulink model (mdl/slx), including it's linked subsystems to determine uniqueness. I'm having throuble with repeatability (getting the same hash back-to-back on the same model) and/or thoroughness. Here is what I have tried so far and the downsides of each:

1. Saving a copy of the model using save_system with BreakAllLinks. Stripping timestamps and UUIDs, and taking the hash of that.

• Different kind of unique identifiers keep cropping up that I need to filter out.
• block ordering can vary
• note: using the deprecated ExportToXML option helps a lot to minimize the issues but does not eliminate them

2. Dependency walking the model and hashing each the file of each dependency to create a hash for the model.

• dependencies.fileDependencyAnalysis is very slow
• if a new block (comment, etc) is added to a library, then every model that uses that library will have its uniqueness hash unnecessarily change

3. Recursively running though model structure

• Seemingly infinite loops when talking through structure
• numeric values of the handles change every time

Answer 1

[Kent Schonert]

Answering my own question.. Simulink.BlockDiagram.getChecksum looks like it will do the trick