{"id":1952,"date":"2017-03-17T07:10:55","date_gmt":"2017-03-17T06:10:55","guid":{"rendered":"http:\/\/pensalla.cat\/?p=1952"},"modified":"2017-03-19T11:28:25","modified_gmt":"2017-03-19T10:28:25","slug":"descobrint-el-blockchain","status":"publish","type":"post","link":"https:\/\/pensalla.cat\/?p=1952","title":{"rendered":"Descobrint el Blockchain"},"content":{"rendered":"<div style=\"padding-top:0px;\t\r\npadding-right:0px;\r\npadding-bottom:0px;\r\npadding-left:0px;\r\nmargin-top:0px;\r\nmargin-right:0px;\r\nmargin-bottom:0px;\r\nmargin-left:0px;\"><a href=\"https:\/\/twitter.com\/share\" class=\"twitter-share-button\" \r\n\t\t\t\t        data-url=\"https:\/\/pensalla.cat\/?p=1952\" \r\n\t\t\t\t        data-via=\"jjofra\"\r\n\t\t\t\t\t    data-text=\"Descobrint el Blockchain\"\r\n\t\t\t\t\t    data-related=\"\"\r\n\t\t\t\t\t    data-count=\"none\"\r\n\t\t\t\t\t    data-hashtags=\"\"\r\n\t\t\t\t\t    data-lang=\"autoLANGauto\"\r\n\t\t\t\t\t    data-counturl=\"pensalla.cat\"\r\n\t\t\t\t\t    data-size=\"medium\"\r\n\t\t\t\t\t    data-dnt=\"false\"\t> Tweet <\/a> <\/div>\r\n\t\t                <script>\r\n\t\t\t\t\t    !function(d,s,id) {\r\n\t\t\t\t\t      var js,fjs=d.getElementsByTagName(s)[0];\r\n\t\t\t\t\t      if(!d.getElementById(id)) {\r\n\t\t\t\t\t       js=d.createElement(s);js.id=id;js.src=\"https:\/\/platform.twitter.com\/widgets.js\";fjs.parentNode.insertBefore(js,fjs);\r\n\t\t\t\t\t      }\r\n\t\t\t\t\t    }\r\n\t\t\t\t\t   (document,\"script\",\"twitter-wjs\");\r\n\t\t\t\t\t    <\/script><div>&nbsp;<\/div>\n<div>&nbsp;<\/div>\n<div>El passat 9 de mar\u00e7 es va celebrar a Barcelona la primera\u00a0confer\u00e8ncia <a href=\"http:\/\/www.becon.global\">BECON<\/a> (Blockchain Ecosystem Network) a Catalunya amb l\u2019objectiu d\u2019aconseguir que Barcelona en concret i Catalunya en general, liderin el futur de Blockchain.<\/div>\n<div>&nbsp;<\/div>\n<div>La sessi\u00f3 la va inaugurar Jordi Puigner\u00f3, Secretari de Telecomunicacions de la Generalitat, per confirmar l\u2019inter\u00e8s de l\u2019administraci\u00f3 en aquesta tecnologia.<\/div>\n<div>&nbsp;<\/div>\n<div>BECON \u00e9s part d\u2019una plataforma multisectorial per col\u00b7laborar, fer networking i explicar les tecnologies avan\u00e7ades i les solucions de Blockchain, el que ha de ser la revoluci\u00f3 i ruptura\u00a0m\u00e9s important des d\u2019Internet mateix.<\/div>\n<div>&nbsp;<\/div>\n<div>Tota aquesta tecnologia t\u00e9 un diari, <a href=\"http:\/\/www.the-blockchain.com\">the-blockchain<\/a>, a on podeu trobar tota la informaci\u00f3 de les novetats de Blockchain.<\/div>\n<div>&nbsp;<\/div>\n<div>&nbsp;<\/div>\n<div><b>Per\u00f2, qu\u00e8 \u00e9s Blockchain?<\/b><\/div>\n<div>&nbsp;<\/div>\n<div>Blockchain \u00e9s una base de dades <b>distribu\u00efda<\/b> que mant\u00e9 una <b>llista<\/b> <b>endre\u00e7ada<\/b>\u00a0de registres anomenats blocks, cada block est\u00e0 encriptat,\u00a0t\u00e9 una firma hor\u00e0ria i un enlla\u00e7 al block anterior per\u00f2 el que ho fa rellevant \u00e9s que les dades contingudes en\u00a0els registres o blocks s\u00f3n immutables per definici\u00f3.<\/div>\n<div>&nbsp;<\/div>\n<div><a href=\"https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/4F21E897-9935-422F-87C8-34ABFF885D3D.png\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1953\" src=\"https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/4F21E897-9935-422F-87C8-34ABFF885D3D.png?resize=150%2C399\" alt=\"\" width=\"150\" height=\"399\" srcset=\"https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/4F21E897-9935-422F-87C8-34ABFF885D3D.png?w=150&amp;ssl=1 150w, https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/4F21E897-9935-422F-87C8-34ABFF885D3D.png?resize=113%2C300&amp;ssl=1 113w, https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/4F21E897-9935-422F-87C8-34ABFF885D3D.png?resize=100%2C266&amp;ssl=1 100w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a><\/div>\n<div>&nbsp;<\/div>\n<div>El block inicial \u00e9s el verd, la cadena principal \u00e9s la negra, els blocks orfes s\u00f3n els lila.<\/div>\n<div>&nbsp;<\/div>\n<div>Aix\u00f2 fa que les cadenes del blockchain s\u00f3n p\u00fabliques i poden registrar transaccions entre dues parts eficientment i de forma verificable i permanent.<\/div>\n<div>&nbsp;<\/div>\n<div>El sistema distribu\u00eft el podem assimilar, m\u00e9s o menys, al sistema <b><i>Torrent<\/i><\/b>, els registres estan replicats\u00a0a molts ordinadors i quan necessites tot el contingut s\u2019ha d\u2019anar llegint de diferents ordinadors per tenir tot el block o, fins i tot, tota la cadena.<\/div>\n<div>&nbsp;<\/div>\n<div>&nbsp;<\/div>\n<div>&nbsp;<\/div>\n<div><b>Perqu\u00e8 \u00e9s tan important?<\/b><\/div>\n<div>&nbsp;<\/div>\n<div>Blockchain d\u00f3na resposta les necessitats de\u00a0seguretat de les dades, de tra\u00e7abilitat i toler\u00e0ncia a falles.<\/div>\n<div>&nbsp;<\/div>\n<div>Aix\u00f2 fa que els blockchains siguin molt \u00fatils per enregistrar esdeveniments, registres m\u00e8dics, gesti\u00f3 de la\u00a0identitat, processos transaccionals com una comptabilitat, contractes i un llarg etc\u00e8tera, est\u00e0 molt enfocat a registrar transaccions que mai poden ser alterades retroactivament.<\/div>\n<div>&nbsp;<\/div>\n<div>El sistema permet eliminar molts agents intermediaris que afecten el comer\u00e7 global perqu\u00e8 per ell mateix ja \u00e9s capa\u00e7, per definici\u00f3, de garantir el contingut de les dades, per exemple pot fer desapar\u00e8ixer una instituci\u00f3 com el SWIFT, el que \u00e9s coneguda com \u201cl\u2019home al mig\u201d.<\/div>\n<div>&nbsp;<\/div>\n<div>S\u2019estan estudiant i posant en marxa solucions per:<\/div>\n<div>\n<ul>\n<li>sistemes de vot digital verificats<\/li>\n<li>registres m\u00e8dics<\/li>\n<li>gesti\u00f3 dels copyrights i royaltys de m\u00fasica i dels pagaments als artistes<\/li>\n<li>sistemes de notari p\u00fablic que donen fe de les dades, una mena de segell electr\u00f2nic segur<\/li>\n<\/ul>\n<\/div>\n<div>&nbsp;<\/div>\n<div>Es preveu que per 2027 un 10% del PIB global de tot el m\u00f3n estar\u00e0 guardat en blockchains, i qui ho diu no \u00e9s alg\u00fa poc important, \u00e9s un <a href=\"http:\/\/www3.weforum.org\/docs\/WEF_GAC15_Technological_Tipping_Points_report_2015.pdf#page=24\">informe del World Economic Forum<\/a>.<\/div>\n<div>&nbsp;<\/div>\n<div>&nbsp;<\/div>\n<div>&nbsp;<\/div>\n<div><b>Blockchain i Bitcoin<\/b><\/div>\n<div>&nbsp;<\/div>\n<div>El primer blockchain va ser definit i creat per <a href=\"https:\/\/ca.wikipedia.org\/wiki\/Satoshi_Nakamoto\">Satoshi Nakamoto<\/a> el 2008 i va servir per crear el protocol i el programari de Bitcoin.<\/div>\n<div>&nbsp;<\/div>\n<div>Les especials caracter\u00edstiques de blockchain el fan perfecte per la feina de portar els llibres comptables de totes les transaccions, la xarxa peer-to-peer i un sistema de firma hor\u00e0ria descentralitzat la base de dades de blockchain es gestiona aut\u00f2nomament sense necessitat d\u2019una autoritat central o Banc Central.\u00a0 Ning\u00fa, cap persona, instituci\u00f3 o banc controlen les transaccions de Bitcoins<\/div>\n<div>&nbsp;<\/div>\n<div>El blockchain de Bitcoin a l\u2019Agost del 2014 ocupava 20 GBytes, a la cadena han d\u2019haver-hi totes les transaccions des del primer dia, el Gener del 2015 ja ocupava 30 GBytes (un 50% m\u00e9s), al Gener del 2016 50 GBytes, i el Gener del 2017, fa quatre dies, ja ocupava 100 GBytes.<\/div>\n<div>&nbsp;<\/div>\n<div>Nom\u00e9s existeixen 21 milions de Bitcoins, dels quals 15,5 estan en circulaci\u00f3, a mitjans de gener del 2017 es cotitzaven a $890,90, una mica per sota del m\u00e0xim dels $1000 del Novembre del 2013.<\/div>\n<div>&nbsp;<\/div>\n<div>&nbsp;<\/div>\n<div>\n<p><a href=\"https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/D2EEB816-74B2-41F8-9D5B-DD7D941FF09E.png\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-1954\" src=\"https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/D2EEB816-74B2-41F8-9D5B-DD7D941FF09E-1024x448.png?resize=750%2C328\" alt=\"\" width=\"750\" height=\"328\" srcset=\"https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/D2EEB816-74B2-41F8-9D5B-DD7D941FF09E.png?resize=1024%2C448&amp;ssl=1 1024w, https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/D2EEB816-74B2-41F8-9D5B-DD7D941FF09E.png?resize=300%2C131&amp;ssl=1 300w, https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/D2EEB816-74B2-41F8-9D5B-DD7D941FF09E.png?resize=768%2C336&amp;ssl=1 768w, https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/D2EEB816-74B2-41F8-9D5B-DD7D941FF09E.png?resize=100%2C44&amp;ssl=1 100w, https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/D2EEB816-74B2-41F8-9D5B-DD7D941FF09E.png?resize=150%2C66&amp;ssl=1 150w, https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/D2EEB816-74B2-41F8-9D5B-DD7D941FF09E.png?resize=200%2C87&amp;ssl=1 200w, https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/D2EEB816-74B2-41F8-9D5B-DD7D941FF09E.png?resize=450%2C197&amp;ssl=1 450w, https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/D2EEB816-74B2-41F8-9D5B-DD7D941FF09E.png?resize=600%2C262&amp;ssl=1 600w, https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/D2EEB816-74B2-41F8-9D5B-DD7D941FF09E.png?resize=900%2C394&amp;ssl=1 900w, https:\/\/i0.wp.com\/pensalla.cat\/wp-content\/uploads\/2017\/03\/D2EEB816-74B2-41F8-9D5B-DD7D941FF09E.png?w=1386&amp;ssl=1 1386w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/a><\/p>\n<\/div>\n<div>&nbsp;<\/div>\n<div>&nbsp;<\/div>\n<div>A Bitcoin les transaccions estan amagades i protegides, al contrari de Blockchain que sempre t\u00e9 les transaccions lliures<\/div>\n<div>&nbsp;<\/div>\n<div>&nbsp;<\/div>\n<div>&nbsp;<\/div>\n<div>Si voleu ampliar els vostres coneixements, contacteu amb BECON que el pr\u00f2xim 6 de Juny tenen prevista una masterclass a Barcelona.<\/div>\n<div style=\"padding-top:0px;\t\r\npadding-right:0px;\r\npadding-bottom:0px;\r\npadding-left:0px;\r\nmargin-top:0px;\r\nmargin-right:0px;\r\nmargin-bottom:0px;\r\nmargin-left:0px;\"><a href=\"https:\/\/twitter.com\/share\" class=\"twitter-share-button\" \r\n\t\t\t\t        data-url=\"https:\/\/pensalla.cat\/?p=1952\" \r\n\t\t\t\t        data-via=\"jjofra\"\r\n\t\t\t\t\t    data-text=\"Descobrint el Blockchain\"\r\n\t\t\t\t\t    data-related=\"\"\r\n\t\t\t\t\t    data-count=\"none\"\r\n\t\t\t\t\t    data-hashtags=\"\"\r\n\t\t\t\t\t    data-lang=\"autoLANGauto\"\r\n\t\t\t\t\t    data-counturl=\"pensalla.cat\"\r\n\t\t\t\t\t    data-size=\"medium\"\r\n\t\t\t\t\t    data-dnt=\"false\"\t> Tweet <\/a> <\/div>\r\n\t\t                <script>\r\n\t\t\t\t\t    !function(d,s,id) {\r\n\t\t\t\t\t      var js,fjs=d.getElementsByTagName(s)[0];\r\n\t\t\t\t\t      if(!d.getElementById(id)) {\r\n\t\t\t\t\t       js=d.createElement(s);js.id=id;js.src=\"https:\/\/platform.twitter.com\/widgets.js\";fjs.parentNode.insertBefore(js,fjs);\r\n\t\t\t\t\t      }\r\n\t\t\t\t\t    }\r\n\t\t\t\t\t   (document,\"script\",\"twitter-wjs\");\r\n\t\t\t\t\t    <\/script>","protected":false},"excerpt":{"rendered":"<p>Tweet &nbsp; &nbsp; El passat 9 de mar\u00e7 es va celebrar a Barcelona la primera\u00a0confer\u00e8ncia BECON (Blockchain Ecosystem Network) a Catalunya amb l\u2019objectiu d\u2019aconseguir que Barcelona en concret i Catalunya en general, liderin el futur de Blockchain. &nbsp; La sessi\u00f3<span class=\"ellipsis\">&hellip;<\/span><\/p>\n<div class=\"read-more\"><a href=\"https:\/\/pensalla.cat\/?p=1952\">Read more <span class=\"screen-reader-text\">Descobrint el Blockchain<\/span><span class=\"meta-nav\"> &#8250;<\/span><\/a><\/div>\n<p><!-- end of .read-more --><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[2],"tags":[],"class_list":["post-1952","post","type-post","status-publish","format-standard","hentry","category-articles"],"aioseo_notices":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/pensalla.cat\/index.php?rest_route=\/wp\/v2\/posts\/1952","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pensalla.cat\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pensalla.cat\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pensalla.cat\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pensalla.cat\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1952"}],"version-history":[{"count":0,"href":"https:\/\/pensalla.cat\/index.php?rest_route=\/wp\/v2\/posts\/1952\/revisions"}],"wp:attachment":[{"href":"https:\/\/pensalla.cat\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1952"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pensalla.cat\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1952"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pensalla.cat\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1952"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}