It’s better to calculate checksum for your downloaded files, it can make sure you download that real file from server, not from the ISP proxy server.

In MacOS, you can use md5 and shasum to calculate file checksums.

• calculate a MD5 checksum

md5 xxx.data

• calculate a SHA-1 checksum

shasum -a 1 xxx.data

• calcuate a SHA-256 checksum

shasum -a 256 xxx.data

Thanks for here