EMVCo publishes one contactless kernel specification per payment system family (EMV Book C-1 to C-8) and a common kernel. They share Entry Point and Level 1, and differ in how much of the contact flow they keep.

⚠ This is an overview from public information, in our own words. Each kernel has its own specification, test plan and options; the simulator implements two educational models (C-2 style and C-3 style), not certified kernels.