The signing server provides a service that makes account administration and the associated signature process convenient for the developer.
The signing server can be integrated into a bigger application server, or it can function as a standalone micro-service. Thus, the signing server is well suited to be employed as a security measure to carry out automatic transaction signature in trust based applications and systems.
Here's a list of the basic functionalities that are supported by the signing server-
Primary asset operations
Native contract invocation
NeoVM contract invocation