arno/bitcoinbook
1
0
Fork 0
mirror of https://github.com/bitcoinbook/bitcoinbook synced 2024-12-26 16:38:31 +00:00
Code Issues Releases Wiki Activity

Edited ch07.asciidoc with Atlas code editor

Browse Source
This commit is contained in:
judymcconville@roadrunner.com 2017-05-01 12:31:51 -07:00
parent 3686517aa7
commit 22f6661ecb
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
ch07.asciidoc
View File

@ -427,9 +427,9 @@ When reading Bitcoin Script, remember that the condition being evaluated comes _
==== Conditional Clauses with VERIFY Opcodes
Another form of conditional in Bitcoin Script is any opcode that ends in +VERIFY+. The +VERIFY+ suffix means that if the condition evaluated is not +TRUE+, execution of the script terminates immediately and the transaction is deemed invalid.
((("VERIFY opcodes")))((("IF clauses")))Another form of conditional in Bitcoin Script is any opcode that ends in +VERIFY+. The +VERIFY+ suffix means that if the condition evaluated is not +TRUE+, execution of the script terminates immediately and the transaction is deemed invalid.
Unlike an +IF+ clause, which offers alternative execution paths, the +VERIFY+ suffix acts as a _guard clause_, continuing only if a precondition is met.
((("guard clauses")))Unlike an +IF+ clause, which offers alternative execution paths, the +VERIFY+ suffix acts as a _guard clause_, continuing only if a precondition is met.
For example, the following script requires Bob's signature and a pre-image (secret) that produces a specific hash. Both conditions must be satisfied to unlock: