pull down to refresh
The Touch ID / Secure Enclave magic isn’t in that two-commit demo branch at all. All the code lives in a separate module (specter-enclave) that we keep in its own repo and pull in at build time. The README edits just point macOS users at the notarised DMG. Nothing is “only in the binary” ,  you can reproducibly rebuild the exact same DMG from source in about 15 minutes.
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Is the source for specter-enclave open? (I search the repo but GH says it's being indexed.)
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Yep, 100 % open-source 👍 Repo just went live so GH’s code search is still indexing it.
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The fork only has two commits which update the README (one of which is to download software): https://github.com/cryptoadvance/specter-desktop/compare/master...CryptOpenDevelopment:specter-desktop:master
Where are the other changes?
Are they in the binary you're linking to? Can those changes be verified?