fix chapter links

Author: nathanael

01_0_Introduction.md

@@ -43,7 +43,7 @@ If you have different levels of skill or want to learn different things, you mig
 * If you just want to read about using programming languages, jump to [Chapter Fifteen: Talking to Bitcoin](15_0_Talking_to_Bitcoind.md).
 * If you conversely don't want to do any programming, definitely skip chapters 15-17 while you're reading, and perhaps skip chapters 9-13. The rest of the course should still make sense without them.
 * If you are only interested in Lightning, zap over to [Chapter Eighteen: Understanding Your Lightning Setup](18_0_Understanding_Your_Lightning_Setup.md).
-* If you want to read the major new content added for v2 of the course (2020), following on v1 (2017), read [§3.5: Understanding the Descriptor](03_5_Understanding_the_Descriptor.md), [§4.6: Creating a SegWit Transaction](04_6_Creating_a_Segwit_Transaction.md), [Chapter 7: Expanding Bitcoin with PSBTs](07_0_Expanding_Bitcoin_Transactions_PSBTs.md), [§9.5: Scripting a P2WPKH](09_5_Scripting_a_P2WPKH.md), [§10.5: Scripting a SegWit Script](10_5_Scripting_a_Segwit_Script.md), [Chapter 14: Using Tor](14_0_Using_Tor.md), [Chapter 15: Talking to Bitcoind with C](15_0_Talking_to_Bitcoind.md), [Chapter 16: Programming with Libwally](16_0_Programming_with_Libwally.md), [Chapter Seventeen: Talking to Bitcoind with Other Languages](17_0_Talking_to_Bitcoind_Other.md), [Chapter Eighteen: Understanding ](18_0_Understanding_Your_Lightning_Setup.md), and [Chapter Nineteen: Using Lightning](19_0_Using_Lightning.md).
+* If you want to read the major new content added for v2 of the course (2020), following on v1 (2017), read [§3.5: Understanding the Descriptor](03_5_Understanding_the_Descriptor.md), [§4.6: Creating a SegWit Transaction](04_6_Creating_a_Segwit_Transaction.md), [Chapter 7: Expanding Bitcoin with PSBTs](07_0_Expanding_Bitcoin_Transactions_PSBTs.md), [§9.5: Scripting a P2WPKH](09_5_Scripting_a_P2WPKH.md), [§10.5: Scripting a SegWit Script](10_5_Scripting_a_Segwit_Script.md), [Chapter 14: Using Tor](14_0_Using_Tor.md), [Chapter 15: Using i2p], [Chapter 16: Talking to Bitcoind with C](16_0_Talking_to_Bitcoind.md), [Chapter 17: Programming with Libwally](17_0_Programming_with_Libwally.md), [Chapter 18: Talking to Bitcoind with Other Languages](18_0_Talking_to_Bitcoind_Other.md), [Chapter 19: Understanding ](19_0_Understanding_Your_Lightning_Setup.md), and [Chapter 20: Using Lightning](20_0_Using_Lightning.md).
 
 ## Why to Use this Course
 

16_0_Talking_to_Bitcoind.md

@@ -1,4 +1,4 @@
-# Chapter 15: Talking to Bitcoind with C
+# Chapter 16: Talking to Bitcoind with C
 
 While working with Bitcoin Scripts, we hit the boundaries of what's possible with `bitcoin-cli`: it can't currently be used to generate transactions containing unusual scripts. Shell scripts also aren't great for some things, such as creating listener programs that are constantly polling. Fortunately, there are other ways to access the Bitcoin network: programming APIs.
 
@@ -20,6 +20,6 @@ Supporting objectives include the ability to:
 
 ## Table of Contents
 
-  * [Section One: Accessing Bitcoind in C with RPC Libraries](15_1_Accessing_Bitcoind_with_C.md)
-  * [Section Two: Programming Bitcoind in C with RPC Libraries](15_2_Programming_Bitcoind_with_C.md)
-  * [Section Three: Receiving Notifications in C with ZMQ Libraries](15_3_Receiving_Bitcoind_Notifications_with_C.md)
+  * [Section One: Accessing Bitcoind in C with RPC Libraries](16_1_Accessing_Bitcoind_with_C.md)
+  * [Section Two: Programming Bitcoind in C with RPC Libraries](16_2_Programming_Bitcoind_with_C.md)
+  * [Section Three: Receiving Notifications in C with ZMQ Libraries](16_3_Receiving_Bitcoind_Notifications_with_C.md)

16_1_Accessing_Bitcoind_with_C.md

@@ -1,4 +1,4 @@
-# 15.1: Accessing Bitcoind in C with RPC Libraries
+# 16.1: Accessing Bitcoind in C with RPC Libraries
 
 > :information_source: **NOTE:** This section has been recently added to the course and is an early draft that may still be awaiting review. Caveat reader.
 
@@ -278,4 +278,4 @@ By linking to the `bitcoinrpc` RPC and `jansson` JSON libraries, you can easily
 
 ## What's Next?
 
-Learn more about "Talking to Bitcoind with C" in [15.2: Programming Bitcoind in C with RPC Libraries](15_2_Programming_Bitcoind_with_C.md).
+Learn more about "Talking to Bitcoind with C" in [16.2: Programming Bitcoind in C with RPC Libraries](15_2_Programming_Bitcoind_with_C.md).

16_2_Programming_Bitcoind_with_C.md

@@ -1,4 +1,4 @@
-# 15.2: Programming Bitcoind in C with RPC Libraries
+# 16.2: Programming Bitcoind in C with RPC Libraries
 
 > :information_source: **NOTE:** This section has been recently added to the course and is an early draft that may still be awaiting review. Caveat reader.
 
@@ -344,4 +344,4 @@ With access to a C library, you can create much more fully featured programs tha
 
 ## What's Next?
 
-Learn more about "Talking to Bitcoind with C" in [15.3: Receiving Notifications in C with ZMQ Libraries](15_3_Receiving_Bitcoind_Notifications_with_C.md).
+Learn more about "Talking to Bitcoind with C" in [16.3: Receiving Notifications in C with ZMQ Libraries](15_3_Receiving_Bitcoind_Notifications_with_C.md).

16_3_Receiving_Bitcoind_Notifications_with_C.md

@@ -1,8 +1,8 @@
-# 15.3 Receiving Notifications in C with ZMQ  Libraries
+# 16.3 Receiving Notifications in C with ZMQ  Libraries
 
 > :information_source: **NOTE:** This section has been recently added to the course and is an early draft that may still be awaiting review. Caveat reader.
 
-[§15.1](15_1_Accessing_Bitcoind_with_C.md) and [§15.2](15_2_Programming_Bitcoind_with_C.md) introduced RPC and JSON libraries for C, and in doing so showed one of the advantages of accessing Bitcoin's RPC commands through a programming language: the ability to reasonably create much more complex programs. This chapter introduces a third library, for [ZMQ](http://zeromq.org/), and in doing so reveals another advantage: the ability to monitor for notifications. It will use that for coding a blockchain listener.
+[§16.1](16_1_Accessing_Bitcoind_with_C.md) and [§16.2](16_2_Programming_Bitcoind_with_C.md) introduced RPC and JSON libraries for C, and in doing so showed one of the advantages of accessing Bitcoin's RPC commands through a programming language: the ability to reasonably create much more complex programs. This chapter introduces a third library, for [ZMQ](http://zeromq.org/), and in doing so reveals another advantage: the ability to monitor for notifications. It will use that for coding a blockchain listener.
 
 > :book: ***What is ZMQ?*** ZeroMQ (ZMQ)is a high-performance asynchronous messaging library that provides a message queue.  ZeroMQ supports common messaging patterns (pub/sub, request/reply, client/server, and others) over a variety of transports (TCP, in-process, inter-process, multicast, WebSocket, and more), making inter-process messaging as simple as inter-thread messaging. You can find more details about ZMQ notifications and others kind of messages in [this repo](https://github.com/Actinium-project/ChainTools/blob/master/docs/chainlistener.md).
 
@@ -151,7 +151,7 @@ By using the ZMQ framework, you can easily receive notifications by subscribing
 
 ## What's Next?
 
-Learn more about "Programming with RPC" in [Chapter 16: Programming Bitcoin with Libwally](16_0_Programming_with_Libwally.md).
+Learn more about "Programming with RPC" in [Chapter 17: Programming Bitcoin with Libwally](17_0_Programming_with_Libwally.md).
 
 
 

17_0_Programming_with_Libwally.md

@@ -1,4 +1,4 @@
-# Chapter 16: Programming with Libwally
+# Chapter 17: Programming with Libwally
 
 The previous chapter presented three C Libraries, for RPC, JSON, and ZMQ, all of which are intended to interact directly with `bitcoind`, just like you've been doing since the start. But, sometimes you might want to code without direct access to a `bitcoind`. This might be due to an offline client, or just because you want to keep some functionality internal to your C program. You also might want to get into deeper wallet functionality, like mnemonic word creation or address derivation. That's where Libwally comes in: it's a wallet library for C, C++, Java, NodeJS, or Python, with wrappers also available for other languages, such as Swift.
 
@@ -20,10 +20,10 @@ Supporting objectives include the ability to:
 
 ## Table of Contents
 
-  * [Section One: Setting Up Libwally](16_1_Setting_Up_Libwally.md)
-  * [Section Two: Using BIP39 in Libwally](16_2_Using_BIP39_in_Libwally.md)
-  * [Section Three: Using BIP32 in Libwally](16_3_Using_BIP32_in_Libwally.md)
-  * [Section Four: Using PSBTs in Libwally](16_4_Using_PSBTs_in_Libwally.md) 
-  * [Section Five: Using Scripts in Libwally](16_5_Using_Scripts_in_Libwally.md)
-  * [Section Six: Using Other Functions in Libwally](16_6_Using_Other_Functions_in_Libwally.md)
-  * [Section Seven: Integrating Libwally and Bitcoin-CLI](16_7_Integrating_Libwally_and_Bitcoin-CLI.md)
+  * [Section One: Setting Up Libwally](17_1_Setting_Up_Libwally.md)
+  * [Section Two: Using BIP39 in Libwally](17_2_Using_BIP39_in_Libwally.md)
+  * [Section Three: Using BIP32 in Libwally](17_3_Using_BIP32_in_Libwally.md)
+  * [Section Four: Using PSBTs in Libwally](17_4_Using_PSBTs_in_Libwally.md) 
+  * [Section Five: Using Scripts in Libwally](17_5_Using_Scripts_in_Libwally.md)
+  * [Section Six: Using Other Functions in Libwally](17_6_Using_Other_Functions_in_Libwally.md)
+  * [Section Seven: Integrating Libwally and Bitcoin-CLI](17_7_Integrating_Libwally_and_Bitcoin-CLI.md)

17_1_Setting_Up_Libwally.md

@@ -1,4 +1,4 @@
-# 16.1: Setting Up Libwally
+# 17.1: Setting Up Libwally
 
 > :information_source: **NOTE:** This section has been recently added to the course and is an early draft that may still be awaiting review. Caveat reader.
 
@@ -192,6 +192,6 @@ So what precisely can you do now? That's what the rest of this chapter is about.
 
 ## What's Next?
 
-Learn more about "Programming Bitcoin with Libwally" in [16.2: Using BIP39 in Libwally](16_2_Using_BIP39_in_Libwally.md).
+Learn more about "Programming Bitcoin with Libwally" in [17.2: Using BIP39 in Libwally](17_2_Using_BIP39_in_Libwally.md).
 
 

17_2_Using_BIP39_in_Libwally.md

@@ -1,4 +1,4 @@
-# 16.2: Using BIP39 in Libwally
+# 17.2: Using BIP39 in Libwally
 
 > :information_source: **NOTE:** This section has been recently added to the course and is an early draft that may still be awaiting review. Caveat reader.
 
@@ -103,4 +103,4 @@ BIP39 allows you generate a set of 12-24 Mnemonic words from a seed (and the Lib
 
 ## What's Next?
 
-Learn more about "Programming Bitcoin with Libwally" in [16.3: Using BIP32 in Libwally](16_3_Using_BIP32_in_Libwally.md).
+Learn more about "Programming Bitcoin with Libwally" in [17.3: Using BIP32 in Libwally](17_3_Using_BIP32_in_Libwally.md).

17_3_Using_BIP32_in_Libwally.md

@@ -1,8 +1,8 @@
-# 16.3: Using BIP32 in Libwally
+# 17.3: Using BIP32 in Libwally
 
 > :information_source: **NOTE:** This section has been recently added to the course and is an early draft that may still be awaiting review. Caveat reader.
 
-In [§16.2](16_2_Using_BIP39_in_Libwally.md), you were able to use entropy to generate a seed and its related mnemonic. As you may recall from [§3.5: Understanding the Descriptor](03_5_Understanding_the_Descriptor.md), a seed is the basis of a Hierchical Deterministic (HD) Wallet, where that single seed can be used to generate many addresses. So how do you get from the seed to actual addresses? That's where [BIP32](https://en.bitcoin.it/wiki/BIP_0032) comes in.
+In [§17.2](17_2_Using_BIP39_in_Libwally.md), you were able to use entropy to generate a seed and its related mnemonic. As you may recall from [§3.5: Understanding the Descriptor](03_5_Understanding_the_Descriptor.md), a seed is the basis of a Hierchical Deterministic (HD) Wallet, where that single seed can be used to generate many addresses. So how do you get from the seed to actual addresses? That's where [BIP32](https://en.bitcoin.it/wiki/BIP_0032) comes in.
 
 ## Create an HD Root
 
@@ -139,4 +139,4 @@ An HD wallet allows you to generate a vast number of keys from a single seed. Yo
 
 ## What's Next?
 
-Learn more about "Programming Bitcoin with Libwally" in [16.4: Using PSBTs in Libwally](16_4_Using_PSBTs_in_Libwally.md).
+Learn more about "Programming Bitcoin with Libwally" in [17.4: Using PSBTs in Libwally](17_4_Using_PSBTs_in_Libwally.md).

17_4_Using_PSBTs_in_Libwally.md

@@ -1,4 +1,4 @@
-# 16.4: Using PSBTs in Libwally
+# 17.4: Using PSBTs in Libwally
 
 > :information_source: **NOTE:** This section has been recently added to the course and is an early draft that may still be awaiting review. Caveat reader.
 
@@ -373,4 +373,4 @@ This section could be an entire chapter, as working with PSBTs at a low level is
 
 ## What's Next?
 
-Learn more about "Programming Bitcoin with Libwally" in [16.5: Using Scripts in Libwally](16_5_Using_Scripts_in_Libwally.md).
+Learn more about "Programming Bitcoin with Libwally" in [17.5: Using Scripts in Libwally](17_5_Using_Scripts_in_Libwally.md).