Where to get iskra in Tarkov?

Excuse me, could you please provide some clarity on the matter of acquiring Iskra in Tarkov? I'm quite intrigued by the concept, but I'm not entirely sure where to begin my search. Is Iskra a specific cryptocurrency, or perhaps a service that's exclusive to the Tarkov region? If it's a cryptocurrency, are there any reliable exchanges or platforms where one might be able to purchase it? And if it's a service, could you perhaps direct me towards any reputable providers in the Tarkov area? Your insights would be greatly appreciated.