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【Ethereum 智能合約開發筆記】不用自己跑節點，使用 Infura 和 web3.js 呼叫合約

Infura 提供公開的 Ethereum 主網和測試網路節點。到 Infura 官網申請，只要輸入一點基本資料和 Email，就可以收到 API-key。

Open a webpage that uses the CA with Firefox
Click the lock-icon in the addressbar -> show information -> show certificate
the certificate viewer will open
click details and choose the certificate of the certificate-chain, you want to import to CentOS
click "Export..." and save it as .crt file
Copy the .crt file to /etc/pki/ca-trust/source/anchors on your CentOS machine
run update-ca-trust extract
test it with wget https://thewebsite.org

	\documentclass[dvipdfmx]{jsbook}
	\usepackage{lmodern}
	\usepackage{ccfonts} % ccfonts を入れると、sin, cosだけじゃなくすべての英文がConcreteになってしまうので注意
	\usepackage[euler-digits]{eulervm}
	\usepackage[T1]{fontenc}
	\usepackage{textcomp}
	\usepackage[utf8]{inputenc}
	\usepackage{amsmath,amssymb}
	\pagestyle{empty}
	\begin{document}

	# settings we’re about to change
	osascript -e 'tell application "System Preferences" to quit'
	# Ask for the administrator password upfront
	sudo -v

	# Keep-alive: update existing `sudo` time stamp until `.macos` has finished
	while true; do
	sudo -n true
	sleep 60
	kill -0 "$$" \|\| exit

	import PySide6.QtSvg
	import PySide6.QtGui
	import PySide6.QtCore
	import moviepy.video.VideoClip
	import moviepy.editor
	import numpy as np
	from moviepy.editor import *
	from vectortween.PointAnimation import PointAnimation
	from vectortween.SequentialAnimation import SequentialAnimation

	// File: Skeleton.kt
	@Composable
	fun Skeleton(
	modifier: Modifier = Modifier,
	shape: Shape,
	backgroundColor: Color = SkeletonTokens.BackgroundColor.toColor(),
	contentColor: Color = SkeletonTokens.ContentColor.toColor(),
	maxAlpha: Float = SkeletonTokens.MaxAlpha,
	initialDelay: Int = 0,
	animationSpec: InfiniteRepeatableSpec<Float> = if (initialDelay == 0) {

	<?php

	/**
	* Insert middleware before \Illuminate\Session\Middleware\StartSession::class,
	* Example:
	* ChangeLifetimeMiddleware::class,
	* \Illuminate\Session\Middleware\StartSession::class,
	*/

	namespace App\Http\Middleware;

	#!/bin/bash
	# This should be run from the /ios directory of your project
	rm Podfile.lock
	rm -rf Pods
	rm -rf ~/Library/Caches/CocoaPods
	rm -rf ~/Library/Developer/Xcode/DerivedData
	pod cache clean --all
	pod install