{"version":"1.0","provider_name":"\u5a01\u98a8 Ifu - The Authentic Katana","provider_url":"https:\/\/selected-japanese-swords.com\/ifu","author_name":"\u5a01\u98a8 Ifu","author_url":"https:\/\/selected-japanese-swords.com\/ifu\/author\/sjs\/","title":"Inside the Blade: Metallurgical Secrets of Authentic Katana - \u5a01\u98a8 Ifu - The Authentic Katana","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"OVUvOiqENu\"><a href=\"https:\/\/selected-japanese-swords.com\/ifu\/inside-the-blade\/\">Inside the Blade: Metallurgical Secrets of Authentic Katana<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/selected-japanese-swords.com\/ifu\/inside-the-blade\/embed\/#?secret=OVUvOiqENu\" width=\"600\" height=\"338\" title=\"&#8220;Inside the Blade: Metallurgical Secrets of Authentic Katana&#8221; &#8212; \u5a01\u98a8 Ifu - The Authentic Katana\" data-secret=\"OVUvOiqENu\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/selected-japanese-swords.com\/ifu\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","description":"The Japanese katana is often said to be the only blade in the world that truly achieves the ideal trifecta: unbreakable, unbending, and razor-sharp. What makes this possible? Many experts point to the katana\u2019s distinctive curvature. But beneath this elegant form lies an astonishingly complex process involving the combination of materials with different hardness levels [&hellip;]","thumbnail_url":"https:\/\/selected-japanese-swords.com\/ifu\/wp-content\/uploads\/2025\/07\/Metallurgical-Secrets-of-Authentic-Katana-1024x683.png","thumbnail_width":1024,"thumbnail_height":683}