The WiFiSlax project might not have an official English version or might be hosted on specific sites that cater to such distributions. The steps below are generalized and assume you are downloading from a reputable source.

Get-FileHash -Algorithm SHA256 .\Wifislax-3.1-64bits.iso

Note: Without official hash tables for v3.1, compare with checksums posted on older security forums (e.g., HackForums, Zone-H).