EQSL

From HFUnderground

An eQSL is an electronic QSL or verification that you heard a transmission. They are very popular with pirate radio stations, as they can be immediately sent, and offer more anonymity than paper QSL cards.

They are typically send as a JPG or other image file via email.

Al Fansome owns the critical patents on eQSL technology, leveraging the QNX operating system.