Thanks, but it's unclear to which is a hash file, a signature and whatever else.
Here's the latest output:
Mac:Downloads macUser$ ls
Bitcoin-Qt.app bitcoin-27.0-x86_64-apple-darwin.zip
SHA256SUMS.asc
Mac:Downloads macUser$ gpg --verify SHA256SUMS.asc
gpg: WARNING: multiple signatures detected. Only the first will be checked.
gpg: no signed data
gpg: can't hash datafile: No data
Mac:Downloads macUser$ shasum -a 256 --ignore-missing --check SHA256SUMS.asc
Unknown option: ignore-missing
Type shasum -h for help