I don't know enough about SLYK to suggest a full solution, but couldn't additional checks be performed that confirm it's a SLYK file? Other than all SLYK files

I don't know enough about SLYK to suggest a full solution, but couldn't additional checks be performed that confirm it's a SLYK file? Other than all SLYK files starting with ID, are there any other properties that exist in all SLYK files that could be checked against?