如果您的目的是验证软件的完整性，就应该下载签名文件。
If you intend to verify the software's integrity, you should download the signature file.
这个签名块文件存储相应的签名文件的数字签名。
This signature block file stores the digital signature of the corresponding signature file.
签名者由带有扩展名. SF的签名文件表示。
Each signer is represented by a signature file with extension.sf.
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