arno/bitcoinbook
1
0
Fork 0
mirror of https://github.com/bitcoinbook/bitcoinbook synced 2024-11-22 16:18:11 +00:00
Code Issues Releases Wiki Activity

Edited ch06.asciidoc with Atlas code editor

Browse Source
This commit is contained in:
nadams 2017-05-17 11:46:16 -07:00
parent ab8057e41a
commit aee6dbe417
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
ch06.asciidoc
View File

@ -625,7 +625,7 @@ In the example of Alice's transaction (see the list in <<seralization_of_signatu
Let's look at some of the other +SIGHASH+ types and how they can be used in practice:
+ALL|ANYONECANPAY+ :: ((("charitable donations")))((("use cases", "charitable donations")))This construction can be used to make a "crowdfunding&#x201d;-style transaction. Someone attempting to raise funds can construct a transaction with a single output. The single output pays the "goal" amount to the fundraiser. Such a transaction is obviously not valid, as it has no inputs. However, others can now amend it by adding an input of their own, as a donation. They sign their own input with ALL|ANYONECANPAY. Unless enough inputs are gathered to reach the value of the output, the transaction is invalid. Each donation is a "pledge," which cannot be collected by the fundraiser until the entire goal amount is raised.
+ALL|ANYONECANPAY+ :: ((("charitable donations")))((("use cases", "charitable donations")))This construction can be used to make a "crowdfunding&#x201d;-style transaction. Someone attempting to raise funds can construct a transaction with a single output. The single output pays the "goal" amount to the fundraiser. Such a transaction is obviously not valid, as it has no inputs. However, others can now amend it by adding an input of their own, as a donation. They sign their own input with +ALL|ANYONECANPAY+. Unless enough inputs are gathered to reach the value of the output, the transaction is invalid. Each donation is a "pledge," which cannot be collected by the fundraiser until the entire goal amount is raised.
+NONE+ :: This construction can be used to create a "bearer check" or "blank check" of a specific amount. It commits to the input, but allows the output locking script to be changed. Anyone can write their own bitcoin address into the output locking script and redeem the transaction. However, the output value itself is locked by the signature.
@ -641,7 +641,7 @@ You will not see +SIGHASH+ flags presented as an option in a user's wallet appli
[[ecdsa_math]]
==== ECDSA Math
((("Elliptic Curve Digital Signature Algorithm (ECDSA)")))As mentioned previously, signatures are created by a mathematical function F~sig~ that produces a signature composed of two values _R_ and _S_. In this section we look at the function F~sig~ in more detail.
((("Elliptic Curve Digital Signature Algorithm (ECDSA)")))As mentioned previously, signatures are created by a mathematical function _F_~_sig_~ that produces a signature composed of two values _R_ and _S_. In this section we look at the function _F_~_sig_~ in more detail.
((("public and private keys", "key pairs", "ephemeral")))The signature algorithm first generates an _ephemeral_ (temporary) private public key pair. This temporary key pair is used in the calculation of the _R_ and _S_ values, after a transformation involving the signing private key and the transaction hash.