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first cut of full 3.0 outline

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The following TODO items are intended for a 3.0 version of Learning Bitcoin from the Command Line
## Medium-Scale Updates
The following updates involve updates or the creation of new chapters, but their additions are generally bounded and known.
1. General Update: Consider replacing testnet with signet
1. New Interlude: Creating QR Codes (after 3.3)
* New Subsection: Creating a QR
* New Subsection: Creating a Quick Connect QR
@ -34,6 +39,54 @@ The following TODO items are intended for a 3.0 version of Learning Bitcoin from
* 19.2: Using Swift with Bitcoin Lib [Wolf's library]
* 19.3: Using Swift with Libwally [Wolf's shim]
## Large-Scale Updates
The following updates involve the large-scale work done on Schnorr and Taproot in Bitcoin Core 0.21 and 22. This represents a first cut at how to layout the work, but revision and expansion will likely be needed as everyone's understanding of these new technologies matures.
**Chapter X: Expanding Bitcoin Transactions with Schnorr** (probably between chapters 6+7)
* New Section X.1: Understanding Schnorr Signatures
* New Subsection: Understanding the Math of Schnorr
* Explanation: Add + subtract for one signature
* New Subsection: Supporting MuSig
* New Subsection: Understanding the Use of Adapter Signatures
* New Subsection: Knowing the Advantages of Schnorr
* Explanation: size, 64 bytes vs 72, better for multisigs
* Explanation: speed, linear, validate a million-sig multisig in 2 minutes
* Explanation: privacy, no difference between MuSig and sig, no detection of Lightning
* Explanation: also better security, non-malleability
* Reference: https://github.com/bitcoin/bips/blob/master/bip-0340.mediawiki
* New Section X.2: Using Schnorr Signatures
* New Subsection: Signing with Schnorr
* New Subsection: Adding a Schnorr Signature
* New Subsection: Reading a Schnorr Signature
* Update Chapter 6 (Multisigs) to Integrate with Schnorr
**Chapter Y: Improving Bitcoin Scripts with Taproot** (probably between chapters 13+14)
* New Section Y.1: Understanding MAST
* New Subsection: Improving Privacy with MAST
* New Subsection: Laying out a Script in MAST
* New Subsection: Knowing the Advantages of MAST
* Explanation: larger scripts
* Explanation: hidden branches of scripts
* Explanation: fungibility
* https://github.com/bitcoin/bips/blob/master/bip-0114.mediawiki
* New Section Y.2: Understanding Taproot
* New Subsection: Integrating MAST with Taproot
* Explanation: Expanding Segwit
* Explanation: Integrating Schnorr Signatures
* New Subsection: KNowing the Advantages of Taproot
* Explanation: even more privacy; scripts and other addresses are indistinbuishable
* Reference: https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki
* Reference: https://github.com/bitcoin/bips/blob/master/bip-0342.mediawiki
* New Subsection Y.3: Creating a Taproot Script
* New Subsection Y.4: Importing a tr Desciptor
* New Subsection Y.5: Making a P2TR Payment
* Update Chapter 9 to Integrate with Taproot
* Mention Taproot in 9.1 or 9.2
* Add New Section 9.6: Scripting a P2TR (mostly a pointer to Chapter Y)
## Further Updates
The following updates could be part of v3.0 or could be further future, depending on interest and funding.
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* Reference: https://diyhpl.us/wiki/transcripts/blockstream-webinars/2019-07-31-rusty-russell-getting-started-with-c-lightning/
* Reference: https://twitter.com/roasbeef/status/1389649064753471488_
9. Schnorr (2021)
14. Taproot (August/November)
* First Successful Taproot Transactions (Peter W., Twitter)