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@ -379,7 +379,7 @@ In this section, we will demonstrate the basic components of the bitcoin transac
((("transactions", "scripts and Script language", "lock and unlock script construction")))Bitcoin's transaction validation engine relies on two types of scripts to validate transactions: a locking script and an unlocking script.
A locking script is a spending condition placed on an output: it specifies the conditions that must be met to spend the output in the future. Historically, the locking script was called a _scriptPubKey_, because it usually contained a public key or bitcoin address (public key hash). In this book we refer to it as a "locking script" to acknowledge the much broader range of possibilities of this scripting technology. In most bitcoin applications, what we refer to as a locking script will appear in the source code as +scriptPubKey+. You will also see the locking script referred to as a _witness script_ (see <<segwit>>) or more generally as a _cryptographic puzzle_. These terms all mean the same thing, at different levels of abstraction.
((("locking scripts")))((("unlocking scripts")))((("scripting", "locking scripts")))A locking script is a spending condition placed on an output: it specifies the conditions that must be met to spend the output in the future. ((("scriptPubKey")))Historically, the locking script was called a _scriptPubKey_, because it usually contained a public key or bitcoin address (public key hash). In this book we refer to it as a "locking script" to acknowledge the much broader range of possibilities of this scripting technology. In most bitcoin applications, what we refer to as a locking script will appear in the source code as +scriptPubKey+. ((("witnesses")))((("cryptographic puzzles")))You will also see the locking script referred to as a _witness script_ (see <<segwit>>) or more generally as a _cryptographic puzzle_. These terms all mean the same thing, at different levels of abstraction.
An unlocking script is a script that "solves," or satisfies, the conditions placed on an output by a locking script and allows the output to be spent. Unlocking scripts are part of every transaction input. Most of the time they contain a digital signature produced by the user's wallet from his or her private key. Historically, the unlocking script is called _scriptSig_, because it usually contained a digital signature. In most bitcoin applications, the source code refers to the unlocking script as +scriptSig+. You will also see the unlocking script referred to as a _witness_ (see <<segwit>>). In this book, we refer to it as an "unlocking script" to acknowledge the much broader range of locking script requirements, because not all unlocking scripts must contain signatures.