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Edited ch07.asciidoc with Atlas code editor

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judymcconville@roadrunner.com 2017-05-01 10:38:28 -07:00
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@ -81,7 +81,7 @@ From now on, if you see a multisig unlocking script, you should expect to see an
((("transactions", "advanced", "Pay-to-Script-Hash")))((("scripting", "Pay-to-Script-Hash", id="Spay07")))Pay-to-Script-Hash (P2SH) was introduced in 2012 as a powerful new type of transaction that greatly simplifies the use of complex transaction scripts. To explain the need for P2SH, let's look at a practical example.
((("import/export applications")))((("use cases", "import/export")))((("scripting", "Pay-to-Script-Hash", "import/export example")))((("Pay-to-Script-Hash (P2SH)", "import/export example")))In <<ch01_intro_what_is_bitcoin>> we introduced Mohammed, an electronics importer based in Dubai. Mohammed's company uses bitcoin's multisignature feature extensively for its corporate accounts. Multisignature scripts are one of the most common uses of bitcoin's advanced scripting capabilities and are a very powerful feature. Mohammed's company uses a multisignature script for all customer payments, known in accounting terms as "accounts receivable," or AR. With the multisignature scheme, any payments made by customers are locked in such a way that they require at least two signatures to release, from Mohammed and one of his partners or from his attorney who has a backup key. A multisignature scheme like that offers corporate governance controls and protects against theft, embezzlement, or loss.
((("import/export applications")))((("use cases", "import/export")))((("scripting", "Pay-to-Script-Hash", "import/export example")))((("Pay-to-Script-Hash (P2SH)", "import/export example")))In <<ch01_intro_what_is_bitcoin>> we introduced Mohammed, an electronics importer based in Dubai. Mohammed's company uses bitcoin's multisignature feature extensively for its corporate accounts. Multisignature scripts are one of the most common uses of bitcoin's advanced scripting capabilities and are a very powerful feature. ((("accounts receivable (AR)")))Mohammed's company uses a multisignature script for all customer payments, known in accounting terms as "accounts receivable," or AR. With the multisignature scheme, any payments made by customers are locked in such a way that they require at least two signatures to release, from Mohammed and one of his partners or from his attorney who has a backup key. A multisignature scheme like that offers corporate governance controls and protects against theft, embezzlement, or loss.
The resulting script is quite long and looks like this:
@ -93,7 +93,7 @@ Although multisignature scripts are a powerful feature, they are cumbersome to u
P2SH was developed to resolve these practical difficulties and to make the use of complex scripts as easy as a payment to a bitcoin address. With P2SH payments, the complex locking script is replaced with its digital fingerprint, a cryptographic hash. When a transaction attempting to spend the UTXO is presented later, it must contain the script that matches the hash, in addition to the unlocking script. In simple terms, P2SH means "pay to a script matching this hash, a script that will be presented later when this output is spent."
In P2SH transactions, the locking script that is replaced by a hash is referred to as the _redeem script_ because it is presented to the system at redemption time rather than as a locking script. <<without_p2sh>> shows the script without P2SH and <<with_p2sh>> shows the same script encoded with P2SH.
((("redeem scripts")))((("scripting", "redeem scripts")))In P2SH transactions, the locking script that is replaced by a hash is referred to as the _redeem script_ because it is presented to the system at redemption time rather than as a locking script. <<without_p2sh>> shows the script without P2SH and <<with_p2sh>> shows the same script encoded with P2SH.
[[without_p2sh]]
.Complex script without P2SH