在享受一晚的美夢後，小美一早精神抖搜的出門運動。但回家開始準備 CBP 的時候，看到下面第三個主題心就涼了一半。第三個單元怎麼這麼多單元呀，不過文字天書般的第二主題密碼學都捱過了，頭都洗一半那就按部就班各個擊破吧!

Bitcoin Basics

• Bitcoin Community: Understand how users, advocates, developers, businesses, and governments impact the Bitcoin Protocol. Explain what types of institutions are actively involved in promoting, maintaining, or lobbying on behalf of the industry.
• Bitcoin Addresses and Keys: Understand how bitcoin addresses and keys are generated. Explain the relationship between bitcoin addresses, public keys, and private keys; distinguish between them and describe the primary use of each. In terms of addresses and keys, describe how funds are accessed and transferred on the bitcoin network.
• Bitcoin Transactions: Describe a bitcoin transaction in terms of inputs and outputs. Explain why a simple bitcoin transaction is irreversible. Understand the basics of transaction fees.
• Bitcoin Blockchain Ledger: Explain how bitcoin’s blockchain functions as a public ledger. What information is public?
• bitcoin the Unit: Know and understand the denominations of bitcoin and their relation to one another (e.g. millibit, satoshi). Explain the difference between Bitcoin (capitalized B) and bitcoin. Recognize other commonly used symbols referring to bitcoin as a digital currency.
• Bitcoin the Network: Understand network basics such as how the network is connected and the importance of independent nodes in the structure. Explain common network attacks (such as DDoS) and how the network is secured from these types of attacks.
• Bitcoin Improvement Proposals (BIPs): What is a BIP? Explain the basic process of submitting, evaluating, and implementing a BIP. Review Github ­ Bitcoin Improvement Proposals
• Buying and Selling bitcoin: What are the different ways users can buy and sell bitcoin? What is a bitcoin exchange? Who uses bitcoin exchanges and why? Understand the risks of storing bitcoin on exchanges and identify best practices for storing bitcoin.
• Blockchain Explorers: What is a blockchain explorer? How can they be used to trace payments?
• UTXOs: What is an Unspent Transaction Output? How do these affect transactions you send and the change that is leftover from your transaction?

Bitcoin Community

Understand how users, advocates, developers, businesses, and governments impact the Bitcoin Protocol. Explain what types of institutions are actively involved in promoting, maintaining, or lobbying on behalf of the industry.

在比特幣社群中，有各式各樣的角色，分別說明如下：

1. User 使用者
   只要使用錢包創建了比特幣地址便是比特幣的使用者，是比特幣社群數量最多也是最重要的角色。沒有龐大的使用者支持，就無法建立目前比特幣的經濟生態。

2. Educators 教育者
   有許多的個人或企業透過教育大眾比特幣的知識與如何使用，來推廣並擴展比特幣的經濟規模。

3. Marketers 行銷者
   跟教育者類似主要透過各種行銷方式推廣比特幣並擴展比特幣的經濟規模。

4. Faucets 水龍頭
   水龍頭網站提供非常少量免費的比特幣，通常網站上有各式各樣的廣告。並需透過點擊廣告的方式才能取得少量免費的比特幣。

5. Miner 礦工
   目前在家使用家用型電腦已經無法有效獲得挖礦獎勵，因此專業的礦工都是採購特殊設計且較高效節能的 ASIC 礦機來挖礦，由於挖礦獎勵固定故有效降低成本是礦工能獲利的關鍵。

6. Investing 投資者
   不論是每日交易或是長期持有比特幣的投資者，也是比特幣經濟生態的重要角色，且是大量交易時影響價格波動的主要角色。

7. Developer 開發者
   維護比特幣系統並提出建議方案來改善比特幣系統。

除了上述幾個主要角色外，尚有比特幣基金會兼具教育者及維繫開發者社群的角色。

本文同時發佈於作者部落格：https://www.bdetw.com/bitcoin-community/

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