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@ -372,12 +372,12 @@ In this section, we will demonstrate the basic components of the bitcoin transac
==== Stateless Verification
((("transactions", "scripts and Script language", "stateless verification")))The bitcoin transaction script language is stateless, in that there is no state prior to execution of the script, or state saved after execution of the script. Therefore, all the information needed to execute a script is contained within the script. A script will predictably execute the same way on any system. If your system verifies a script, you can be sure that every other system in the bitcoin network will also verify the script, meaning that a valid transaction is valid for everyone and everyone knows this. This predictability of outcomes is an essential benefit of the bitcoin system.
((("transactions", "scripts and Script language", "stateless verification")))((("stateless verification")))The bitcoin transaction script language is stateless, in that there is no state prior to execution of the script, or state saved after execution of the script. Therefore, all the information needed to execute a script is contained within the script. A script will predictably execute the same way on any system. If your system verifies a script, you can be sure that every other system in the bitcoin network will also verify the script, meaning that a valid transaction is valid for everyone and everyone knows this. This predictability of outcomes is an essential benefit of the bitcoin system.
[[tx_lock_unlock]]
==== Script Construction (Lock + Unlock)
Bitcoin's transaction validation engine relies on two types of scripts to validate transactions: a locking script and an unlocking script.
((("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.