What is a m-check?

Could you please elaborate on what exactly a "m-check" is? I'm not familiar with this term in the context of cryptocurrency or finance. Is it a specific type of payment method, a security feature, or something else entirely? If it's related to digital currencies, does it involve any specific blockchain technology or is it a more traditional banking tool adapted for the digital age? I'm curious to learn more about how it works and where it fits within the broader landscape of financial services and technology.