March 2018
Beginner to intermediate
656 pages
20h 9m
English
Content preview from Mastering Blockchain - Second Edition
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Commonly used opcodes
All opcodes are declared in the script.h file in the Bitcoin reference client source code.
This can be accessed from the link at https://github.com/bitcoin/bitcoin/blob/master/src/script/script.h under the following comment:
/** Script opcodes */
A description of the most commonly used opcodes is listed here. This table is taken from the Bitcoin developer's guide:
|
Opcode |
Description |
|
OP_CHECKSIG |
This takes a public key and signature and validates the signature of the hash of the transaction. If it matches, then TRUE is pushed onto the stack; otherwise, FALSE is pushed. |
|
OP_EQUAL |
This returns 1 if the inputs are exactly equal; otherwise, 0 is returned. |
|
OP_DUP |
This duplicates the top item in the stack. ... |
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