Compare the output with the MD5 checksum provided on the Cisco download page.
As direct download links may change or expire, I recommend using the Cisco website to download the image. However, if you're looking for a direct link, you can try: Nxos.7.0.3.i7.9.bin Download--
After downloading the image, verify the MD5 checksum to ensure the file integrity: Compare the output with the MD5 checksum provided
https://software.cisco.com/download/navigator.do?keyType=Software%20Center&ft=1&url=/softwarecenter/release/nxos/7.0.3.I7.9/nxos.7.0.3.I7.9.bin Nxos.7.0.3.i7.9.bin Download--
When you're ready to install or upgrade, refer to the Cisco Nexus Installation and Upgrade Guide for detailed instructions.
Please note that this link might not work if you're not logged in or if the link has expired.