Code Signing is a developer tool that reads files' signing information and validates the signature. 
There is no more need to use command-line tools, parse the results, or read the definition of OSStatus'es. The application uses a native Security framework to get all needed data and visualize validation results in a representative way.
Code Signing application has been made to speed up and improve the software development process and to help us focus on creativity, but not on machine error parsing.

Quickly validate and gather signing information.
Just drag and drop any kind of file and the verification process will start automatically. No other actions or setup are needed. The application will emphasize all possible validation errors.

Check multiple files simultaneously by adding them to the sidebar.
The application supports multiple files validation in parallel, no need to wait until the process is finished.

Compare multiple signatures.
Select multiple files at once to compare their code signatures, common entry types will be highlighted.

Check entitlements.
The entitlements are being visualized in a human-readable format.

Search for entitlements.
Use entitlements glossary to find the needed one.

Verify error codes with glossary.
Security error codes glossary exists to help in verifying possible error codes with constant names and descriptions.

"Code signing" is a macOS security technology that you use to certify that an app was created by you. Once an app is signed, the system can detect any change to the app—whether the change is introduced accidentally or by malicious code.