I haven’t seen it around clearly exposed, but I figure that those 700 BTCs are meant to back the existing BTCs within the Chivo system, and not so much intended to hold as part of the countries reserves. With now over 1,1 Million Chivo wallet users, presumably nearly all will have redeemed their 30$ in bitcoin voucher, so the 700 BTCs kind of backs current redemptions (roughly, give or take).