Does LineageOS provide "Zip Signature Verification"
No! LineageOS does not Zip Signature Verify, instead the LineageOS download site provides SHA256 codes which the user or the downloading app can use to verify their downloads (using a tool like sha256sum).



You can click on the sha256 link above and change the ?sha256 in the url to ?sha1sum for example make this

https://mirrorbits.lineageos.org/full/guacamole/20191212/lineage-16.0-20191212-nightly-guacamole-signed.zip?sha256

Look like this,

https://mirrorbits.lineageos.org/full/guacamole/20191212/lineage-16.0-20191212-nightly-guacamole-signed.zip?sha1



You can verify build authenticity by checking the signature,

keytool -J-Duser.language=en -printcert -jarfile lineage-build-signed.zip