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judymcconville@roadrunner.com 2017-05-01 12:31:51 -07:00
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@ -427,9 +427,9 @@ When reading Bitcoin Script, remember that the condition being evaluated comes _
==== Conditional Clauses with VERIFY Opcodes ==== 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: 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: