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Model signing is an experimental feature with ongoing development, which might include breaking changes. We are releasing these capabilities to improve the integrity of our models for our security-conscious users and to facilitate feedback from the community.

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Getting started

Before trying to verify the signature, ensure that the tensor files have been downloaded with git-lfs and that no files have been added, removed, or modified in your local git checkout: 
git lfs fetch --all
git lfs pull
git lfs checkout
Install the model_signing (v1.0.1) library with the following command: 
pip install 'model-signing==v1.1.1'

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Signature verification

Then verify the signature with the following command ensuring that the IBM identity ‘granite.preview@ibm.com’ was used for signing this model: 
python -m model_signing verify sigstore \
  --signature model.sig \
  --ignore-paths .git \
  --ignore-paths .gitattributes \
  --identity Granite.Preview@ibm.com \
  --identity_provider https://sigstore.verify.ibm.com/oauth2 \
  .