A best-in-class IPA will have a published checksum. Legitimate spacedesk IPAs (from the developer, datronicsoft) have a signature hash. If a website doesn't list the hash, walk away.
best way to get the spacedesk iOS app is through the Apple App Store spacedesk ipa best
Disclaimer: This article is for educational purposes. Sideloading IPAs may violate Apple's terms of service. Always prefer the official App Store. A best-in-class IPA will have a published checksum