{"id":1384,"date":"2020-01-13T00:00:00","date_gmt":"2020-01-13T08:00:00","guid":{"rendered":"https:\/\/www.opennode.com\/blog\/?page_id=1384"},"modified":"2020-01-10T18:45:27","modified_gmt":"2020-01-11T02:45:27","slug":"block-header","status":"publish","type":"page","link":"https:\/\/blog.opennode.com\/blog\/glossary\/block-header\/","title":{"rendered":"Block Header"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> &lt; 1<\/span> <span class=\"rt-label rt-postfix\">minute<\/span><\/span>\n<h1 class=\"wp-block-heading\">Block Header<\/h1>\n\n\n\n<p>Every valid Bitcoin <a href=\"https:\/\/opennode.com\/blog\/glossary\/hash\">block<\/a> requires a header section that distinguishes that it is compatible for the Bitcoin <a href=\"https:\/\/opennode.com\/blog\/glossary\/blockchain\">blockchain<\/a>. The header is also what identifies an individual block from any other block. Blocks in the blockchain are layered sequentially, starting with the <a href=\"https:\/\/opennode.com\/blog\/glossary\/genesis-block\">genesis block<\/a>.\u00a0<\/p>\n\n\n\n<p>All Bitcoin blocks are on the Bitcoin blockchain are 80-bytes long, with the following breakdown:<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>4-byte long Bitcoin version number<\/li><li>32-byte block <a href=\"https:\/\/opennode.com\/blog\/glossary\/hash\">hash<\/a> from previous block<\/li><li>32-byte long <a href=\"https:\/\/opennode.com\/blog\/glossary\/merkle-root\">merkle root<\/a><\/li><li>4-byte long timestamp of the block<\/li><li>4-byte difficulty <a href=\"https:\/\/opennode.com\/blog\/glossary\/target\">target<\/a> for the block.<\/li><li>4-byte <a href=\"https:\/\/opennode.com\/blog\/glossary\/nonce\">nonce<\/a> used by <a href=\"https:\/\/opennode.com\/blog\/glossary\/miners\">miners<\/a>.<\/li><\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Links<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><em>Block Header<\/em> &#8211; <a href=\"https:\/\/www.investopedia.com\/terms\/b\/block-header-cryptocurrency.asp\">Investopedia<\/a><\/li><li><em>Block Header<\/em> &#8211; <a href=\"https:\/\/learnmeabitcoin.com\/guide\/block-header\">Learn Me a Bitcoin<\/a><\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> &lt; 1<\/span> <span class=\"rt-label rt-postfix\">minute<\/span><\/span>Block Header Every valid Bitcoin block requires a header section that distinguishes that it is compatible for the Bitcoin blockchain. The header is also what identifies an individual block from any other block. Blocks in the blockchain are layered sequentially, starting with the genesis block.\u00a0 All Bitcoin blocks are on the Bitcoin blockchain are 80-bytes  &#8230;<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":172,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-notitle.php","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-1384","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Block Header - OpenNode Blog<\/title>\n<meta name=\"robots\" content=\"noindex, follow\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Block Header - OpenNode Blog\" \/>\n<meta property=\"og:description\" content=\"Reading Time:  &lt; 1 minuteBlock Header Every valid Bitcoin block requires a header section that distinguishes that it is compatible for the Bitcoin blockchain. The header is also what identifies an individual block from any other block. Blocks in the blockchain are layered sequentially, starting with the genesis block.\u00a0 All Bitcoin blocks are on the Bitcoin blockchain are 80-bytes ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.opennode.com\/blog\/glossary\/block-header\/\" \/>\n<meta property=\"og:site_name\" content=\"OpenNode Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/OpenNodeco\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@opennode\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/blog.opennode.com\\\/blog\\\/glossary\\\/block-header\\\/\",\"url\":\"https:\\\/\\\/blog.opennode.com\\\/blog\\\/glossary\\\/block-header\\\/\",\"name\":\"Block Header - OpenNode Blog\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blog.opennode.com\\\/blog\\\/#website\"},\"datePublished\":\"2020-01-13T08:00:00+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/blog.opennode.com\\\/blog\\\/glossary\\\/block-header\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/blog.opennode.com\\\/blog\\\/glossary\\\/block-header\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/blog.opennode.com\\\/blog\\\/glossary\\\/block-header\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Main\",\"item\":\"https:\\\/\\\/blog.opennode.com\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Bitcoin Glossary\",\"item\":\"https:\\\/\\\/blog.opennode.com\\\/blog\\\/glossary\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Block Header\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/blog.opennode.com\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/blog.opennode.com\\\/blog\\\/\",\"name\":\"OpenNode Blog\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/blog.opennode.com\\\/blog\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/blog.opennode.com\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/blog.opennode.com\\\/blog\\\/#organization\",\"name\":\"OpenNode\",\"url\":\"https:\\\/\\\/blog.opennode.com\\\/blog\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/blog.opennode.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.opennode.com\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/04\\\/Logomark-1.png\",\"contentUrl\":\"https:\\\/\\\/www.opennode.com\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/04\\\/Logomark-1.png\",\"width\":1920,\"height\":1920,\"caption\":\"OpenNode\"},\"image\":{\"@id\":\"https:\\\/\\\/blog.opennode.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/OpenNodeco\\\/\",\"https:\\\/\\\/x.com\\\/opennode\"]}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Block Header - OpenNode Blog","robots":{"index":"noindex","follow":"follow"},"og_locale":"en_US","og_type":"article","og_title":"Block Header - OpenNode Blog","og_description":"Reading Time:  &lt; 1 minuteBlock Header Every valid Bitcoin block requires a header section that distinguishes that it is compatible for the Bitcoin blockchain. 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