{"id":1192,"date":"2018-07-24T04:07:34","date_gmt":"2018-07-24T03:07:34","guid":{"rendered":"https:\/\/rosetta.vn\/short\/?p=1192"},"modified":"2018-07-25T09:53:27","modified_gmt":"2018-07-25T08:53:27","slug":"how-does-a-blockchain-work-simply-explained-youtube","status":"publish","type":"post","link":"https:\/\/rosetta.vn\/short\/2018\/07\/24\/how-does-a-blockchain-work-simply-explained-youtube\/","title":{"rendered":"How does a blockchain work &#8211; Simply Explained &#8211; YouTube"},"content":{"rendered":"<p>Blockchain ch\u1ed1ng l\u00e0m gi\u1ea3 b\u1eb1ng c\u00e1c c\u01a1 ch\u1ebf:<\/p>\n<ul>\n<li>L\u01b0u hash (n\u1ed9i dung b\u00ean trong \u0111\u1ed5i l\u00e0 l\u00e0m cho hash \u0111\u1ed5i theo, unique), v\u00e0 l\u01b0u c\u1ea3 hash c\u1ee7a block ph\u00eda tr\u01b0\u1edbc<\/li>\n<li>Proof-of-work, \u0111\u1ec3 m\u1ed7i khi mu\u1ed1n s\u1eeda hash cho n\u1ed9i dung thay \u0111\u1ed5i th\u00ec ph\u1ea3i m\u1ea5t t\u1eadn 10 ph\u00fat cho m\u1ed7i block (c\u00f3 b\u00e0i b\u00e1o n\u00f3i proof-of-work l\u00e0m t\u1ed1n nhi\u1ec1u \u0111i\u1ec7n n\u0103ng, ng\u01b0\u1eddi ta \u0111ang xem x\u00e9t proof-of-stake c\u00f3 l\u1ebd hi\u1ec7u qu\u1ea3 h\u01a1n)<\/li>\n<li>Decentralization &amp; voting, c\u01a1 ch\u1ebf l\u00e0 t\u1ea5t c\u1ea3 c\u00e1c users trong m\u1ea1ng \u0111\u1ec1u c\u00f3 b\u1ea3n l\u01b0u c\u1ee7a ri\u00eang m\u00ecnh, \u0111\u1ec3 x\u00e1c th\u1ef1c v\u00e0 khi c\u00f3 m\u1ed9t block b\u1ecb thay \u0111\u1ed5i th\u00ec d\u1ef1a tr\u00ean vote trong m\u1ea1ng \u0111\u00f3, ch\u1ecdn l\u1ea1i n\u1ed9i dung \u0111\u01b0\u1ee3c h\u01a1n 50% users \u0111ang l\u01b0u tr\u1eef.<\/li>\n<\/ul>\n<div class=\"jetpack-video-wrapper\"><span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"750\" height=\"422\" src=\"https:\/\/www.youtube.com\/embed\/SSo_EIwHSd4?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en-US&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation\"><\/iframe><\/span><\/div>\n<p>&#8212;<\/p>\n<p>Th\u00f4ng tin th\u00eam v\u1ec1 t\u00ednh kh\u00f4ng hi\u1ec7u qu\u1ea3 c\u1ee7a Blockchain v\u1ec1 m\u1eb7t n\u0103ng l\u01b0\u1ee3ng:<\/p>\n<p><a href=\"https:\/\/digiconomist.net\/bitcoin-energy-consumption\">https:\/\/digiconomist.net\/bitcoin-energy-consumption<\/a><\/p>\n<blockquote>\n<table id=\"table_1\" class=\"display responsive nowrap data-t wpDataTable dataTable no-footer\" role=\"grid\">\n<tbody>\n<tr id=\"table_3_row_8\" class=\"odd\" role=\"row\">\n<td class=\" column-Description\">Electricity consumed per transaction (KWh)<\/td>\n<td class=\" column-Value\">962<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 id=\"comparison\">Comparing Bitcoin\u2019s energy consumption to other payment systems<\/h2>\n<p>To put the energy consumed by the Bitcoin network into perspective we can compare it to another payment system like VISA for example. According to VISA, the company consumed a total amount of\u00a0<a href=\"https:\/\/usa.visa.com\/dam\/VCOM\/download\/corporate-responsibility\/visa-2016-corporate-responsibility-report.pdf\">674,922 Gigajoules<\/a>\u00a0of energy (from various sources) globally for all its operations. This means that VISA has an energy need equal to that of around 17,000 U.S. households. We also know VISA processed\u00a0<a href=\"https:\/\/investor.visa.com\/annual-report-meeting\/\" target=\"_blank\" rel=\"noopener\">111.2 billion transactions in 2017<\/a>. With the help of these numbers, it is possible to compare both networks and show that Bitcoin is extremely more energy intensive per transaction than VISA (note that the chart below compares a single Bitcoin transaction to 100,000 VISA transactions).<\/p><\/blockquote>\n<p>\u1ede H\u1ed9i th\u1ea3o h\u00e8 2018 t\u1ea1i Warszawa, Ba Lan ng\u00e0y 13-14\/7 v\u1eeba qua, \u00f4ng Tr\u1ea7n Qu\u1ed1c H\u00f9ng (\u0111\u1ebfn t\u1eeb vi\u1ec7n nghi\u00ean c\u1ee9u t\u00e0i ch\u00ednh <a href=\"http:\/\/iif.com\">iif.com<\/a>) c\u00f3 tr\u00ecnh b\u00e0y v\u1ec1 Bitcoin, Blockchain v\u00e0 \u0111i\u1ec3m y\u1ebfu v\u1ec1 n\u0103ng l\u01b0\u1ee3ng n\u00e0y. V\u00ec n\u00f3 t\u1ed1n qu\u00e1 nhi\u1ec1u n\u0103ng l\u01b0\u1ee3ng, n\u00ean s\u1ebd kh\u00f4ng th\u1ec3 c\u1ea1nh tranh \u0111\u01b0\u1ee3c v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng nh\u01b0 VISA, Master v\u1ec1 l\u01b0\u1ee3ng giao d\u1ecbch (transaction) c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1ef1c thi, v\u00e0 do \u0111\u00f3 Bitcoin hay c\u00e1c \u0111\u1ed3ng ti\u1ec1n d\u1ef1a tr\u00ean m\u00e3 h\u00f3a t\u01b0\u01a1ng t\u1ef1 s\u1ebd kh\u00f4ng th\u1ec3 tr\u1edf th\u00e0nh ph\u01b0\u01a1ng th\u1ee9c thanh to\u00e1n m\u1edbi (m\u1ed9t c\u00e1ch ph\u1ed5 th\u00f4ng). Kh\u1ea3 n\u0103ng \u1ee9ng d\u1ee5ng Blockchain l\u00e0 n\u1eb1m trong c\u00e1c m\u1ea1ng ng\u01b0\u1eddi d\u00f9ng nh\u1ecf, c\u00f3 tr\u1ecdng t\u00e2m h\u1ea1n ch\u1ebf.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Blockchain ch\u1ed1ng l\u00e0m gi\u1ea3 b\u1eb1ng c\u00e1c c\u01a1 ch\u1ebf: L\u01b0u hash (n\u1ed9i dung b\u00ean trong \u0111\u1ed5i l\u00e0 l\u00e0m cho hash \u0111\u1ed5i theo, unique), v\u00e0 l\u01b0u c\u1ea3 hash c\u1ee7a block ph\u00eda tr\u01b0\u1edbc Proof-of-work, \u0111\u1ec3 m\u1ed7i khi mu\u1ed1n s\u1eeda hash cho n\u1ed9i dung<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false},"categories":[30],"tags":[813,812,811],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p8jhJx-je","_links":{"self":[{"href":"https:\/\/rosetta.vn\/short\/wp-json\/wp\/v2\/posts\/1192"}],"collection":[{"href":"https:\/\/rosetta.vn\/short\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rosetta.vn\/short\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rosetta.vn\/short\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rosetta.vn\/short\/wp-json\/wp\/v2\/comments?post=1192"}],"version-history":[{"count":0,"href":"https:\/\/rosetta.vn\/short\/wp-json\/wp\/v2\/posts\/1192\/revisions"}],"wp:attachment":[{"href":"https:\/\/rosetta.vn\/short\/wp-json\/wp\/v2\/media?parent=1192"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rosetta.vn\/short\/wp-json\/wp\/v2\/categories?post=1192"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rosetta.vn\/short\/wp-json\/wp\/v2\/tags?post=1192"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}