6 ▁Asian ▁Winter ▁Games ▁was ▁held ▁on ▁ 4 ▁March ▁ 1 9 8 6 ▁in ▁S app oro , ▁Japan . ▁ ▁Records ▁ ▁Results ▁▁ ▁Lü ▁Sh uh ai ▁was ▁awarded ▁bronze ▁because ▁of ▁no ▁three - med al ▁swe ep ▁per ▁country ▁rule . ▁ ▁References ▁Results ▁ ▁External ▁links ▁Ch ang ch un ▁ 2 0 0 7 ▁Official ▁website ▁ ▁Men ▁ 1 0 0 0 0 <0x0A> </s> ▁Hash c ash ▁is ▁a ▁proof - of - work ▁system ▁used ▁to ▁limit ▁email ▁sp am ▁and ▁den ial - of - service ▁attacks , ▁and ▁more ▁recently ▁has ▁become ▁known ▁for ▁its ▁use ▁in ▁bit co in ▁( and ▁other ▁crypt oc urr encies ) ▁as ▁part ▁of ▁the ▁min ing ▁algorithm . ▁Hash c ash ▁was ▁proposed ▁in ▁ 1 9 9 7 ▁by ▁Adam ▁Back ▁and ▁described ▁more ▁formally ▁in ▁Back ' s ▁ 2 0 0 2 ▁paper ▁" Hash c ash ▁- ▁A ▁Den ial ▁of ▁Service ▁C ounter - Me asure ". ▁ ▁Background ▁A ▁similar ▁idea ▁was ▁first ▁proposed ▁by ▁C yn th ia ▁D work ▁and ▁Mon i ▁Na or ▁and ▁Eli ▁P ony at ov ski ▁in ▁their ▁ 1 9 9 2 ▁paper ▁" P ric ing ▁via ▁Process ing ▁or ▁Com b atting ▁J unk ▁Mail ", ▁ ▁How ▁it ▁works ▁Hash c ash ▁is ▁a ▁crypt ographic ▁hash - based ▁proof - of - work ▁algorithm ▁that ▁requires ▁a ▁select able ▁amount ▁of ▁work ▁to ▁compute