1) the server signs what's uploaded using one or more TUF keys shared to RAM on every pypi upload server.
2) the client uploads a cryptographic signature (made using their own key) along with the package, and the corresponding public key is trusted to upload for that package name, and the client retrieves said public key and verifies the downloaded package's cryptographic signature before installing.
FWIU, 1 (PyPI signs uploads with TUF) was implemented, but 2 (users sign their own packages before uploading the signed package and signature, (and then 1)) was never implemented?
2) the client uploads a cryptographic signature (made using their own key) along with the package, and the corresponding public key is trusted to upload for that package name, and the client retrieves said public key and verifies the downloaded package's cryptographic signature before installing.
FWIU, 1 (PyPI signs uploads with TUF) was implemented, but 2 (users sign their own packages before uploading the signed package and signature, (and then 1)) was never implemented?