{"id":12883,"date":"2022-09-06T10:30:24","date_gmt":"2022-09-06T08:30:24","guid":{"rendered":"http:\/\/crypto50x.com\/dvojite-vydavky-v-kryptomene\/"},"modified":"2026-08-15T14:26:21","modified_gmt":"2026-08-15T12:26:21","slug":"dvojite-vydavky-v-kryptomene","status":"publish","type":"post","link":"https:\/\/crypto50x.com\/sk\/dvojite-vydavky-v-kryptomene\/","title":{"rendered":"Dvojit\u00e9 v\u00fddavky v kryptomene"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Ak nie\u010do m\u00f4\u017ee dok\u00e1za\u0165 ve\u013ek\u00e9 mo\u017enosti finan\u010dn\u00fdch technol\u00f3gi\u00ed na celom svete, potom s\u00fa to kryptomeny. V priebehu rokov sa technol\u00f3govia sna\u017eili vymyslie\u0165 \u010disto virtu\u00e1lnu menu. V\u0161etky tieto snahy v\u0161ak stroskotali na overovan\u00ed transakci\u00ed a obmedzovan\u00ed mo\u017en\u00e9ho dvojit\u00e9ho vynakladania prostriedkov. Ale h\u013ea, technol\u00f3gia blockchain a kryptografia pri\u0161li pr\u00e1ve v\u010das, aby situ\u00e1ciu zvr\u00e1tili.  <\/span><br \/>\n<span style=\"font-weight: 400;\">Kryptomena existuje ako investi\u010dn\u00e1 mo\u017enos\u0165 a platobn\u00fd prostriedok, v\u010faka ktor\u00e9mu sa obchodovanie stalo fascinuj\u00facim aj m\u00f3dnym. Ide o syst\u00e9m digit\u00e1lnych alebo virtu\u00e1lnych mien s decentralizovanou \u00fa\u010dtovnou knihou, v\u010faka ktorej maj\u00fa majitelia pln\u00fa zodpovednos\u0165. \u0164a\u017eba kryptomien, ktor\u00e1 je energeticky n\u00e1ro\u010dn\u00fd komplexn\u00fd proces vykon\u00e1van\u00fd na r\u00f4znych po\u010d\u00edta\u010doch naz\u00fdvan\u00fdch uzly, vytv\u00e1ra nov\u00e9 kryptomeny. Pri transakci\u00e1ch s kryptomenami,  <\/span><a href=\"https:\/\/kryptovaluta.info\/#3_Start_kjopet\"><span style=\"font-weight: 400;\">inform\u00e1cie o va\u0161ich transakci\u00e1ch sa zverej\u0148uj\u00fa v sieti kryptomien.<\/span><\/a><span style=\"font-weight: 400;\"> <\/span><br \/>\n<span style=\"font-weight: 400;\">V kryptografickom svete maj\u00fa po\u010d\u00edta\u010dov\u00e9 syst\u00e9my programy a sie\u0165, ktor\u00e9 zabezpe\u010duj\u00fa, aby sa t\u00e1 ist\u00e1 transakcia neuskuto\u010dnila dvakr\u00e1t. \u010ci u\u017e ide o prevod kryptomeny, <a href=\"https:\/\/kryptovaluta.info\/en\/about-swapping-cryptocurrency\/\">v\u00fdmenu bitcoinov<\/a> alebo ak\u00fako\u013evek inicializovan\u00fa transakciu, programy zabezpe\u010duj\u00fa, aby sa neduplikovali. Ale ako zvy\u010dajne, ka\u017ed\u00fd syst\u00e9m mus\u00ed ma\u0165 poruchu a mus\u00ed ma\u0165 ur\u010dit\u00fa duplicitu. Sie\u0165 syst\u00e9mu kryptomien sa nel\u00ed\u0161i od ak\u00e9hoko\u013evek in\u00e9ho syst\u00e9mu, ktor\u00fd zaznamen\u00e1va duplicitu. V takomto pr\u00edpade duplicita predstavuje poruchu alebo anom\u00e1liu, na ktor\u00fa sa r\u00fdchlo upozorn\u00ed a vyvol\u00e1 sa poplach, aby sa vykonala potrebn\u00e1 n\u00e1prava.  <\/span><br \/>\n<span style=\"font-weight: 400;\">Zo syst\u00e9mu fal\u0161ovania alebo duplicity m\u00f4\u017ee vznikn\u00fa\u0165 probl\u00e9m dvojit\u00e9ho m\u00ed\u0148ania v kryptomen\u00e1ch. Na rozdiel od fyzickej meny sa virtu\u00e1lna mena uchov\u00e1va v digit\u00e1lnom s\u00fabore, ktor\u00fd m\u00f4\u017ee by\u0165 sfal\u0161ovan\u00fd alebo duplikovan\u00fd. Celkovo by jasn\u00e9 pochopenie zdvojn\u00e1sobenia v\u00fddavkov v kryptomen\u00e1ch najprv znamenalo  <\/span><a href=\"https:\/\/crypto50x.com\/sk\/co-potrebujete-vediet-o-technologii-blockchain\/\"><br \/>\n<span style=\"font-weight: 400;\">preh\u013ead fungovania blockchainu<\/span><br \/>\n<\/a><span style=\"font-weight: 400;\">. <\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Defin\u00edcia: Dvojit\u00e9 m\u00ed\u0148anie v kryptomene<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Ke\u010f v kryptomen\u00e1ch hovor\u00edme o dvojitej spotrebe, jednoducho t\u00fdm ozna\u010dujeme riziko, \u017ee by sa kryptografick\u00e1 mena mohla pou\u017ei\u0165 viac ako raz. Existuje mo\u017enos\u0165, \u017ee transakcia<\/span><a href=\"https:\/\/www.investopedia.com\/terms\/d\/doublespending.asp#:~:text=Double%2Dspending%20occurs%20when%20someone,t%20adequately%20protected%20and%20secured.\"><span style=\"font-weight: 400;\">  inform\u00e1cie v blockchaine sa daj\u00fa zmeni\u0165 alebo duplikova\u0165.<\/span><\/a><span style=\"font-weight: 400;\">  ak s\u00fa splnen\u00e9 ur\u010dit\u00e9 krit\u00e9ri\u00e1. Pr\u00e1ve stanoven\u00e9 podmienky d\u00e1vaj\u00fa priestor pre modifikovan\u00e9 bloky do blockchainu.<\/span><br \/>\n<span style=\"font-weight: 400;\">Pre niektor\u00fdch je to ozna\u010dovan\u00e9 ako blockchain dvojit\u00e9 v\u00fddavky, ktor\u00e9 zah\u0155\u0148aj\u00fa v\u00fddavky va\u0161ej digit\u00e1lnej hotovosti v rovnakej v\u00fd\u0161ke dvakr\u00e1t. Kryptografick\u00e1 transakcia m\u00e1 mo\u017enos\u0165 by\u0165 op\u00e4tovne odvysielan\u00e1 alebo dokonca skop\u00edrovan\u00e1. To iniciuje mo\u017enos\u0165, \u017ee majite\u013e m\u00f4\u017ee t\u00fa ist\u00fa kryptomenu, povedzme BTC, min\u00fa\u0165 dvakr\u00e1t.  <\/span><\/p>\n<p><iframe loading=\"lazy\" title=\"What is Double Spending\" width=\"1200\" height=\"900\" src=\"https:\/\/www.youtube.com\/embed\/cOc7V64HUDQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p><span style=\"font-weight: 400;\">Nakoniec je tu potenci\u00e1lna chyba digit\u00e1lneho hotovostn\u00e9ho syst\u00e9mu. Ten ist\u00fd virtu\u00e1lny token sa m\u00f4\u017ee pou\u017ei\u0165 dvakr\u00e1t alebo viackr\u00e1t. Ide o digit\u00e1lny s\u00fabor v r\u00e1mci digit\u00e1lneho tokenu, ktor\u00fd mo\u017eno duplikova\u0165 alebo dokonca sfal\u0161ova\u0165. Existuj\u00fa v\u0161ak niektor\u00e9 z\u00e1kladn\u00e9 kryptografick\u00e9 techniky na obmedzenie dvojit\u00e9ho m\u00ed\u0148ania kryptomien a z\u00e1rove\u0148 na zachovanie anonymity transakci\u00ed.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Najsk\u00f4r pochopme a presk\u00famajme, ako blockchain funguje<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">V roku 2009 bola predstaven\u00e1 technol\u00f3gia s ve\u013ek\u00fdm potenci\u00e1lom a v\u00fdznamom, technol\u00f3gia blockchain. Ide o technol\u00f3giu, ktor\u00e1 umo\u017e\u0148uje dvom alebo viacer\u00fdm stran\u00e1m vykon\u00e1va\u0165 transakcie bez overenia tre\u0165ou stranou. Kryptomena je sk\u00f4r  <\/span><a href=\"https:\/\/crypto50x.com\/sk\/\"><br \/>\n<span style=\"font-weight: 400;\">distribuovan\u00fa \u00fa\u010dtovn\u00fa knihu, teda \u017eiadny subjekt, ktor\u00fd by mal v\u00fdhradn\u00fa kontrolu nad v\u0161etk\u00fdmi transakciami, ktor\u00e9 sa v nej uskuto\u010d\u0148uj\u00fa.<\/span><br \/>\n<\/a><span style=\"font-weight: 400;\">. <\/span><br \/>\n<span style=\"font-weight: 400;\">Na overenie transakcie s kryptomenami je nastaven\u00fd po\u010d\u00edta\u010dov\u00fd program. Tento po\u010d\u00edta\u010dov\u00fd program je k dispoz\u00edcii v\u0161etk\u00fdm a ka\u017ed\u00e9mu, kto sa zaober\u00e1 obchodovan\u00edm s kryptomenami. Pr\u00e1ve blockchain uchov\u00e1va bezpe\u010dn\u00fd a decentralizovan\u00fd z\u00e1znam v\u0161etk\u00fdch kryptografick\u00fdch transakci\u00ed.<\/span><br \/>\n<span style=\"font-weight: 400;\">Pri ka\u017edom \u0165a\u017een\u00ed novej kryptomeny sa t\u00e1to automaticky zavedie do blockchainu. Potom tak\u00fdto panensk\u00fd \u0161ifr\u00e1tor dostane za\u0161ifrovan\u00fa \u010d\u00edseln\u00fa identitu. Pridelen\u00e9 \u0161ifrovanie obsahuje \u010dasov\u00fa pe\u010diatku, \u00fadaje o transakcii a inform\u00e1cie z predch\u00e1dzaj\u00faceho bloku. \u0160ifrovanie t\u00fdchto inform\u00e1ci\u00ed sa uskuto\u010d\u0148uje prostredn\u00edctvom  <\/span><a href=\"https:\/\/www.investopedia.com\/terms\/d\/doublespending.asp#:~:text=Double-spending%20occurs%20when%20so\"><br \/>\n<span style=\"font-weight: 400;\">bezpe\u010dnostn\u00fd protokol, napr\u00edklad algoritmus SHA-256 pre BTC<\/span><br \/>\n<\/a><span style=\"font-weight: 400;\">.<\/span><br \/>\n<span style=\"font-weight: 400;\">Po overen\u00ed bloku inform\u00e1ci\u00ed ban\u00edkmi sa blok uzavrie a vygeneruje sa nov\u00fd. Tento proces sa opakuje a jeho v\u00fdsledkom s\u00fa v\u00e4\u010d\u0161ie bloky kryptomien, ktor\u00e9 s\u00fa k dispoz\u00edcii kupuj\u00facim a obchodn\u00edkom. Hlavn\u00fdm \u00fa\u010delom technol\u00f3gie blockchain je zabr\u00e1ni\u0165 duplicitn\u00fdm k\u00f3pi\u00e1m digit\u00e1lnej meny, \u010d\u00edm sa zabr\u00e1ni dvojit\u00e9mu vydaniu tej istej kryptomeny. Ale bolo to naozaj \u00faspe\u0161n\u00e9? Zist\u00edme to.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Hlbok\u00e9 pochopenie dvojit\u00e9ho m\u00ed\u0148ania<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Po presk\u00faman\u00ed n\u00e1\u0161ho ch\u00e1pania technol\u00f3gie blockchain mus\u00edte by\u0165 tip top na dvojit\u00e9 v\u00fddavky. Mo\u017enos\u0165, \u017ee budete m\u00ed\u0148a\u0165 dvakr\u00e1t, je, ak bol vy\u0165a\u017een\u00fd tajn\u00fd blok a predbehol generovanie nov\u00e9ho blockchainu.  <\/span><br \/>\n<span style=\"font-weight: 400;\">Ak je tak\u00fdto pr\u00edpad mo\u017en\u00fd, tento nov\u00fd duplicitn\u00fd re\u0165azec by bol do siete zaveden\u00fd sk\u00f4r, ne\u017e by vzniklo ak\u00e9ko\u013evek podozrenie. T\u00fdm sa definit\u00edvne umo\u017en\u00ed, aby ho sie\u0165 rozpoznala ako najnov\u0161iu d\u00e1vku blokov a pridala ho do blockchainu.  <\/span><br \/>\n<span style=\"font-weight: 400;\">V pr\u00edpade decentralizovan\u00e9ho syst\u00e9mu, ak\u00fdm je kryptomena, je probl\u00e9m dvojit\u00e9ho m\u00ed\u0148ania mimoriadne \u0165a\u017eko napravite\u013en\u00fd. Uvedomujete si, \u017ee na overovanie transakci\u00ed v kryptomen\u00e1ch nie je potrebn\u00e1 tretia strana. V d\u00f4sledku tohto praktick\u00e9ho pou\u017e\u00edvania sa na mnoh\u00fdch serveroch ukladaj\u00fa identick\u00e9 aktu\u00e1lne k\u00f3pie transak\u010dnej knihy. Pri vysielan\u00ed transakci\u00ed bud\u00fa prich\u00e1dza\u0165 na ka\u017ed\u00fd server v r\u00f4znom \u010dase.<\/span><br \/>\n<span style=\"font-weight: 400;\">Preto ak dve transakcie min\u00fa rovnak\u00fd token<\/span><a href=\"https:\/\/en.wikipedia.org\/wiki\/Double-spending\"><br \/>\n<span style=\"font-weight: 400;\">, ka\u017ed\u00fd server bude pova\u017eova\u0165 prv\u00fa transakciu, ktor\u00e1 pr\u00edde, za platn\u00fa<\/span><br \/>\n<\/a><span style=\"font-weight: 400;\">. Ostatn\u00e9, ktor\u00e9 pr\u00eddu nesk\u00f4r, bud\u00fa preto neplatn\u00e9, a preto sa servery nedohodn\u00fa, preto\u017ee pozorovania ka\u017ed\u00e9ho servera s\u00fa rovnako platn\u00e9.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Minimaliz\u00e1cia v\u00fdskytu dvojit\u00fdch v\u00fddavkov v kryptomen\u00e1ch  <\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Aj ke\u010f je v kryptomen\u00e1ch na\u010falej pretrv\u00e1vaj\u00facim rizikom, existuje mo\u017enos\u0165, \u017ee technol\u00f3gia blockchain jeho v\u00fdskyt minimalizuje. Mo\u017enos\u0165 vytvorenia tajn\u00e9ho bloku do blockchainu je ve\u013emi minim\u00e1lna. Je to preto, \u017ee sa stret\u00e1va viacero ban\u00edkov  <\/span><a href=\"https:\/\/en.wikipedia.org\/wiki\/Double-spending\"><br \/>\n<span style=\"font-weight: 400;\">prostredn\u00edctvom konsenzu\u00e1lneho algoritmu na overenie a prijatie ka\u017edej transakcie.<\/span><br \/>\n<\/a><span style=\"font-weight: 400;\">.<\/span><br \/>\n<span style=\"font-weight: 400;\">Blockchain a algoritmus konsenzu sa pohybuj\u00fa r\u00fdchlo. T\u00e1to r\u00fdchlos\u0165 je ve\u013emi d\u00f4le\u017eit\u00e1 na to, aby sa \u017eiadny modifikovan\u00fd blok nemal \u0161ancu dosta\u0165 do blockchainu. Duplikovan\u00e9 bloky by sa v takomto pr\u00edpade pova\u017eovali za neaktu\u00e1lne pred ich prijat\u00edm. Aj keby ho server prijal, sie\u0165 by st\u00e1le potvrdila inform\u00e1cie v bloku a ten by bol odmietnut\u00fd.<\/span><br \/>\n<span style=\"font-weight: 400;\">Spolo\u010dnos\u0165 BTC sa kompetentne vysporiadala s probl\u00e9mom dvojit\u00e9ho \u010derpania prostredn\u00edctvom svojich <\/span><a href=\"https:\/\/www.javatpoint.com\/blockchain-double-spending\"><br \/>\n<span style=\"font-weight: 400;\">zaveden\u00edm potvrdzovacieho mechanizmu a spolo\u010dnej \u00fa\u010dtovnej knihy<\/span><br \/>\n<\/a><span style=\"font-weight: 400;\">. To je v podstate st\u00e1le zn\u00e1me ako technol\u00f3gia blockchain. Preto je ve\u013emi \u0165a\u017ek\u00e9 sfal\u0161ova\u0165 alebo duplikova\u0165 blok do blockchainu vzh\u013eadom na obrovsk\u00fd v\u00fdpo\u010dtov\u00fd v\u00fdkon, ktor\u00fd by ste potrebovali.  <\/span><\/p>\n<h2><span style=\"font-weight: 400;\">\u00datok na dvojit\u00e9 v\u00fddavky<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Hlavn\u00e9 riziko pre blockchain je v podobe <\/span><a href=\"https:\/\/www.investopedia.com\/terms\/1\/51-attack.asp\"><br \/>\n<span style=\"font-weight: 400;\">51% \u00fatoku<\/span><br \/>\n<\/a><span style=\"font-weight: 400;\">. To je v\u00e4\u010d\u0161inou mo\u017en\u00e9, ak m\u00e1 ban\u00edk pod kontrolou viac ako 50 % v\u00fdpo\u010dtov\u00e9ho v\u00fdkonu. V\u00fdpo\u010dtov\u00fd v\u00fdkon v tomto pr\u00edpade overuje transakcie, vytv\u00e1ra bloky a pride\u013euje kryptomenu. Pou\u017e\u00edvate\u013e, ktor\u00fd m\u00e1 pod kontrolou v\u00e4\u010d\u0161inu v\u00fdpo\u010dtov\u00e9ho syst\u00e9mu v blockchaine, sa st\u00e1va viac vystaven\u00fd 51% \u00fatoku.<\/span><\/p>\n<p>For mer nyttig informasjon, se <a href=\"https:\/\/refinans.net\/hjelp-til-a-rydde-opp-i-gjeld\/\">https:\/\/www.eiendomsfinans.no\/hjelp-til-a-rydde-opp-i-gjeld\/<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ak nie\u010do m\u00f4\u017ee dok\u00e1za\u0165 ve\u013ek\u00e9 mo\u017enosti finan\u010dn\u00fdch technol\u00f3gi\u00ed na celom svete, potom s\u00fa to kryptomeny. V priebehu rokov sa technol\u00f3govia sna\u017eili vymyslie\u0165 \u010disto virtu\u00e1lnu menu. V\u0161etky tieto snahy v\u0161ak stroskotali na overovan\u00ed transakci\u00ed a obmedzovan\u00ed mo\u017en\u00e9ho dvojit\u00e9ho vynakladania prostriedkov. Ale h\u013ea, technol\u00f3gia blockchain a kryptografia pri\u0161li pr\u00e1ve v\u010das, aby situ\u00e1ciu zvr\u00e1tili. Kryptomena existuje ako investi\u010dn\u00e1 &#8230; <a title=\"Dvojit\u00e9 v\u00fddavky v kryptomene\" class=\"read-more\" href=\"https:\/\/crypto50x.com\/sk\/dvojite-vydavky-v-kryptomene\/\" aria-label=\"Pre\u010d\u00edtajte si viac o Dvojit\u00e9 v\u00fddavky v kryptomene\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":12857,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[639,913],"tags":[917,1693,8782,8779,8775,7381],"class_list":["post-12883","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kryptomena-sk","category-technologia-blockchain-sk","tag-blockchain-technologie-sk","tag-distribuovana-uctovna-kniha","tag-financne-technologie","tag-siet-kryptomien","tag-utok-na-dvojite-vydavky","tag-zdvojnasobenie-vydavkov"],"_links":{"self":[{"href":"https:\/\/crypto50x.com\/sk\/wp-json\/wp\/v2\/posts\/12883","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/crypto50x.com\/sk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/crypto50x.com\/sk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/crypto50x.com\/sk\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/crypto50x.com\/sk\/wp-json\/wp\/v2\/comments?post=12883"}],"version-history":[{"count":1,"href":"https:\/\/crypto50x.com\/sk\/wp-json\/wp\/v2\/posts\/12883\/revisions"}],"predecessor-version":[{"id":12973,"href":"https:\/\/crypto50x.com\/sk\/wp-json\/wp\/v2\/posts\/12883\/revisions\/12973"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/crypto50x.com\/sk\/wp-json\/wp\/v2\/media\/12857"}],"wp:attachment":[{"href":"https:\/\/crypto50x.com\/sk\/wp-json\/wp\/v2\/media?parent=12883"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/crypto50x.com\/sk\/wp-json\/wp\/v2\/categories?post=12883"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/crypto50x.com\/sk\/wp-json\/wp\/v2\/tags?post=12883"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}