{"id":6035,"date":"2023-07-10T19:02:03","date_gmt":"2023-07-10T19:02:03","guid":{"rendered":"https:\/\/icoholder.com\/blog\/?p=6035"},"modified":"2025-02-06T20:41:26","modified_gmt":"2025-02-06T20:41:26","slug":"autenticacao-de-transacoes-blockchain","status":"publish","type":"post","link":"https:\/\/icoholder.com\/blog\/autenticacao-de-transacoes-blockchain\/","title":{"rendered":"Autentica\u00e7\u00e3o De Transa\u00e7\u00f5es Blockchain"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_75 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/icoholder.com\/blog\/autenticacao-de-transacoes-blockchain\/#Autenticacao\" >Autentica\u00e7\u00e3o<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/icoholder.com\/blog\/autenticacao-de-transacoes-blockchain\/#Autorizacao\" >Autoriza\u00e7\u00e3o<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/icoholder.com\/blog\/autenticacao-de-transacoes-blockchain\/#Proof_of_Work\" >Proof of Work<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/icoholder.com\/blog\/autenticacao-de-transacoes-blockchain\/#Eficacia_da_mineracao\" >Efic\u00e1cia da minera\u00e7\u00e3o<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/icoholder.com\/blog\/autenticacao-de-transacoes-blockchain\/#O_problema_com_o_Proof_of_Work\" >O problema com o Proof of Work<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/icoholder.com\/blog\/autenticacao-de-transacoes-blockchain\/#Proof_of_Stake\" >Proof of Stake<\/a><\/li><\/ul><\/nav><\/div>\n<p>Uma transa\u00e7\u00e3o precisa ser autorizada e validada antes de ser adicionada ao blockchain. Ela deve passar por v\u00e1rios procedimentos essenciais. Um deles \u00e9 a autentica\u00e7\u00e3o de transa\u00e7\u00f5es. Vamos focar na autentica\u00e7\u00e3o de chave criptogr\u00e1fica, autoriza\u00e7\u00e3o de prova de trabalho, fun\u00e7\u00e3o de minera\u00e7\u00e3o e o uso recente de protocolos Proof of Stake (PoS) em redes blockchain.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Autenticacao\"><\/span>Autentica\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Embora a blockchain original fosse descentralizada (sem um banco ou \u00f3rg\u00e3o regulador controlando quem pode fazer transa\u00e7\u00f5es), as transa\u00e7\u00f5es precisam ser autenticadas. Os mineiros fazem isso com chaves criptogr\u00e1ficas, uma sequ\u00eancia de informa\u00e7\u00f5es semelhantes a uma senha. Essas chaves identificam um usu\u00e1rio e concedem acesso \u00e0 sua &#8220;conta&#8221; ou &#8220;carteira&#8221;.<\/p>\n<p>Cada usu\u00e1rio tem uma chave privada \u00fanica e uma chave p\u00fablica vis\u00edvel para todos. A combina\u00e7\u00e3o das duas cria uma identidade digital segura. Isso permite a autentica\u00e7\u00e3o de transa\u00e7\u00f5es atrav\u00e9s de assinaturas digitais, que &#8220;desbloqueiam&#8221; a transa\u00e7\u00e3o desejada.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Autorizacao\"><\/span>Autoriza\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Os mineiros devem autorizar uma transa\u00e7\u00e3o antes de sua inclus\u00e3o em uma blockchain depois que os usu\u00e1rios concordarem com ela.<\/p>\n<p>O consenso \u00e9 necess\u00e1rio para incluir uma transa\u00e7\u00e3o em uma blockchain p\u00fablica. Para que uma transa\u00e7\u00e3o seja v\u00e1lida, a maioria dos &#8220;n\u00f3s&#8221; (ou computadores) da rede deve concordar. O sistema utiliza recompensas para atrair os propriet\u00e1rios das m\u00e1quinas da rede para verificar as transa\u00e7\u00f5es. Este procedimento \u00e9 chamado de \u201cproof of work\u201d.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Proof_of_Work\"><\/span>Proof of Work<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No Proof of Work, os usu\u00e1rios que possuem computadores na rede devem resolver um quebra-cabe\u00e7a matem\u00e1tico para adicionar um bloco \u00e0 cadeia. A minera\u00e7\u00e3o \u00e9 o processo de encontrar uma solu\u00e7\u00e3o, e o sistema recompensa os mineiros com criptomoedas.<\/p>\n<p>No entanto, a minera\u00e7\u00e3o \u00e9 dif\u00edcil. A probabilidade de resolver o quebra-cabe\u00e7a matem\u00e1tico \u00e9 de cerca de 1 em 5,9 trilh\u00f5es. A \u00fanica forma de fazer isso \u00e9 por tentativa e erro. Isso consome muita energia e exige computadores poderosos. Como levaria um ano de computador para resolver o problema, os benef\u00edcios da minera\u00e7\u00e3o devem compensar os custos dos computadores e da eletricidade.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Eficacia_da_mineracao\"><\/span>Efic\u00e1cia da minera\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>De acordo com o Cambridge Bitcoin Electricity Consumption Index, o consumo anual de eletricidade da rede de minera\u00e7\u00e3o de bitcoin \u00e9 pr\u00f3ximo a 70 terawatt-hora (TWh). Isso torna a rede a 40\u00aa maior consumidora mundial de eletricidade. Os dados de 2016 compilados pela CIA mostraram que a Irlanda, classificada em 68\u00ba lugar, utiliza pouco mais de um ter\u00e7o do consumo do Bitcoin, ou 25 TWh. A \u00c1ustria, classificada em 42\u00ba lugar, utiliza 64,6 TWh anualmente.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"O_problema_com_o_Proof_of_Work\"><\/span>O problema com o Proof of Work<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Os mineiros frequentemente re\u00fanem recursos por meio de esquemas, juntando um n\u00famero consider\u00e1vel de mineiros. Isso permite alcan\u00e7ar economias de escala. Os mineiros dividem as recompensas e taxas da rede de blocos.<\/p>\n<p>\u00c0 medida que a blockchain cresce, a dificuldade do problema e o tamanho da rede aumentam. Isso dispersa ainda mais a cadeia e torna o hack ou sabotagem mais desafiadores. Por\u00e9m, na realidade, um pequeno n\u00famero de pools de minera\u00e7\u00e3o controla a maior parte da energia mineradora. Essas grandes organiza\u00e7\u00f5es possuem a capacidade necess\u00e1ria para sustentar e expandir uma rede de blockchain baseada na valida\u00e7\u00e3o Proof of Work.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Proof_of_Stake\"><\/span>Proof of Stake<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-pm-slice=\"1 1 []\">Posteriormente, as redes de blockchain utilizaram m\u00e9todos consensuais de valida\u00e7\u00e3o &#8220;<a href=\"https:\/\/icoholder.com\/en\/news\/solana-price-predictions-2024-2030-growth-and-future-outlook\">Proof of Stake<\/a>&#8220;, que exigem que os participantes tenham uma participa\u00e7\u00e3o na blockchain, tipicamente possuindo uma parte da criptomoeda, para ter a chance de escolher, confirmar e validar as transa\u00e7\u00f5es, garantindo a autentica\u00e7\u00e3o de transa\u00e7\u00f5es de forma eficiente. Como n\u00e3o h\u00e1 necessidade de minera\u00e7\u00e3o, isto conserva uma quantidade significativa de recursos computacionais.<\/p>\n<p>Al\u00e9m disso, os &#8220;Contratos Inteligentes&#8221; que completam automaticamente as transa\u00e7\u00f5es quando crit\u00e9rios espec\u00edficos s\u00e3o satisfeitos, agora fazem parte das tecnologias de blockchain.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Uma transa\u00e7\u00e3o precisa ser autorizada e validada antes de ser adicionada ao blockchain. Ela deve passar por v\u00e1rios procedimentos essenciais. Um deles \u00e9 a autentica\u00e7\u00e3o &hellip; <\/p>\n","protected":false},"author":1,"featured_media":5899,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-6035","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bitcoin"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Autentica\u00e7\u00e3o De Transa\u00e7\u00f5es Blockchain<\/title>\n<meta name=\"description\" content=\"A autentica\u00e7\u00e3o de transa\u00e7\u00f5es \u00e9 crucial para garantir a seguran\u00e7a e a validade em redes de blockchain - IcoHolder.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/icoholder.com\/blog\/autenticacao-de-transacoes-blockchain\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Autentica\u00e7\u00e3o De Transa\u00e7\u00f5es Blockchain\" \/>\n<meta property=\"og:description\" content=\"A autentica\u00e7\u00e3o de transa\u00e7\u00f5es \u00e9 crucial para garantir a seguran\u00e7a e a validade em redes de blockchain - 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