diff --git a/Basic/crypto.md b/Basic/crypto.md
index 93d075c..7ef24e1 100644
--- a/Basic/crypto.md
+++ b/Basic/crypto.md
@@ -282,10 +282,11 @@ for i in range(size):
 
 # Reference
 1. [数字签名是什么？](http://www.ruanyifeng.com/blog/2011/08/what_is_a_digital_signature.html)
-2. [比特币背后的密码学原理](https://www.jianshu.com/p/225ff9439132)
-3. [《区块链原理设计与应用》第5章：密码学与安全技术](https://github.com/yjjnls/books/blob/master/block%20chain/%E5%8C%BA%E5%9D%97%E9%93%BE%E5%8E%9F%E7%90%86%E3%80%81%E8%AE%BE%E8%AE%A1%E4%B8%8E%E5%BA%94%E7%94%A8.pdf)
-4. [Secure Hash Algorithms](https://en.wikipedia.org/wiki/Secure_Hash_Algorithms)
-5. [Digital Signature Algorithm](https://en.wikipedia.org/wiki/Digital_Signature_Algorithm)
-6. [用实例给新手讲解RSA加密算法](https://www.cnblogs.com/jiftle/p/7903762.html)
-7. [用Go语言实现环签名的签名和验证（一）](https://blog.csdn.net/qq_38200023/article/details/79902049)
-8. [用Go语言实现环签名的签名和验证（二）](https://blog.csdn.net/qq_38200023/article/details/79912530)
\ No newline at end of file
+2. [Digital Signatures](http://learnmeabitcoin.com/guide/digital_signatures)
+3. [比特币背后的密码学原理](https://www.jianshu.com/p/225ff9439132)
+4. [《区块链原理设计与应用》第5章：密码学与安全技术](https://github.com/yjjnls/books/blob/master/block%20chain/%E5%8C%BA%E5%9D%97%E9%93%BE%E5%8E%9F%E7%90%86%E3%80%81%E8%AE%BE%E8%AE%A1%E4%B8%8E%E5%BA%94%E7%94%A8.pdf)
+5. [Secure Hash Algorithms](https://en.wikipedia.org/wiki/Secure_Hash_Algorithms)
+6. [Digital Signature Algorithm](https://en.wikipedia.org/wiki/Digital_Signature_Algorithm)
+7. [用实例给新手讲解RSA加密算法](https://www.cnblogs.com/jiftle/p/7903762.html)
+8. [用Go语言实现环签名的签名和验证（一）](https://blog.csdn.net/qq_38200023/article/details/79902049)
+9. [用Go语言实现环签名的签名和验证（二）](https://blog.csdn.net/qq_38200023/article/details/79912530)
\ No newline at end of file
diff --git a/README.md b/README.md
index 921a030..ef110c9 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,12 @@ The blockchain is an incorruptible digital ledger of economic transactions that
   - [Frequently Asked Questions (F.A.Q.s) & Answers](#frequently-asked-questions-faqs--answers)
   - [Basic Introduction](#basic-introduction)
     - [Encryption knowledge](#encryption-knowledge)
+    - [Consensus](#consensus)
+    - [Account and transaction model](#account-and-transaction-model)
+    - [Exchange](#exchange)
+    - [Applications](#applications)
+    - [Governance](#governance)
+    - [Digital currency ranking](#digital-currency-ranking)
   - [Development Tutorial](#development-tutorial)
     - [BitCoin](#bitcoin)
     - [Ethereum](#ethereum)
@@ -32,7 +38,7 @@ The blockchain is an incorruptible digital ledger of economic transactions that
     - [IFPS](#ifps)
   - [Further Extension](#further-extension)
     - [Books](#books)
-    - [Applications](#applications)
+    - [Applications](#applications-1)
       - [Identity Applications](#identity-applications)
         - [Public Blockchain Identity](#public-blockchain-identity)
         - [Blockchain as a collateral](#blockchain-as-a-collateral)
@@ -135,41 +141,37 @@ The "classic" Satoshi-blockchain is like a git repo with a single master branch
     * [Merkle tree in blockchain](./Basic/merkle_tree_in_blockchain.md)  
     * [Merkle DAG](http://www.sohu.com/a/247540268_100222281)   
     * [**CryptoNote v2.0**](https://cryptonote.org/whitepaper.pdf) - Untraceable Transactions and Egalitarian Proof-of-work
-    <!--   
-    ### Consensus
-       -->
+<!--   
+### Consensus
+    -->
 -   **Consensus**  
-    <!--    
-    ### Account and transaction model
-       -->
+<!--    
+### Account and transaction model
+    -->
 -   **Account and transaction model**  
-    <!-- 
-    ### Exchange
-        -->
+<!-- 
+### Exchange
+    -->
 -   **Exchange**  
-    <!-- 
-    ### Applications
-        -->
+<!-- 
+### Applications
+    -->
 -   **Applications**  
     * [Do You Need a Blockchain?](https://spectrum.ieee.org/computing/networks/do-you-need-a-blockchain)  
     * [What can't blockchain do?](https://www.jianshu.com/p/70f6a29a6296)  
     * [More](./Extension/application.md) 
-    <!--     
-    ### Capacity expansion and chain governance
-        -->
--   **[Capacity expansion and chain governance](https://github.com/yfeng125/blockchain-tutorial/blob/master/doc/%E2%80%8B25.%E6%AF%94%E7%89%B9%E5%B8%81%EF%BC%9A%E6%89%A9%E5%AE%B9%E4%B9%8B%E4%BA%89%E3%80%81IFO%E4%B8%8E%E9%93%BE%E4%B8%8A%E6%B2%BB%E7%90%86.md)**   
-    <!--     
-    ### Digital currency ranking
-        -->
--   **[Digital currency ranking](https://coinmarketcap.com/)**   
+<!--     
+### Governance
+    -->
+-   **Governance**
+    * [Blockchains should not be democracies](https://haseebq.com/blockchains-should-not-be-democracies/)                                       
+<!-- * [](https://github.com/yfeng125/blockchain-tutorial/blob/master/doc/%E2%80%8B25.%E6%AF%94%E7%89%B9%E5%B8%81%EF%BC%9A%E6%89%A9%E5%AE%B9%E4%B9%8B%E4%BA%89%E3%80%81IFO%E4%B8%8E%E9%93%BE%E4%B8%8A%E6%B2%BB%E7%90%86.md)   -->
 
-<!-- -   [ ] [Consensus](<>)  
--   [Account and transaction model](./Basic/account.md)  
--   [ ] [Bitcoin basics](<>)  
--   [ ] [Ethereum basics](<>)  
-    - [ ] []()链上治理
--   [ ] [Exchange](<>)  
--   [Applications](./Extension/application.md)  -->
+
+<!--     
+### Digital currency ranking
+    -->
+-   **[Digital currency ranking](https://coinmarketcap.com/)**   
 
 ---
 ## Development Tutorial