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drusselloctal@gmail.com 2014-10-30 13:54:56 -07:00
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@ -303,14 +303,14 @@ In <<simplemath_script>>, the script +2 3 OP_ADD 5 OP_EQUAL+ demonstrates the ar
.Bitcoin's script validation doing simple math
image::images/msbt_0502.png["TxScriptSimpleMathExample"]
Below is a slightly more complex script, which calculates +((2 + 3) * 2) + 1+. Notice that when the script contains several operators in a row, the stack allows the results of one operator to be acted upon by the next operator:
The following is a slightly more complex script, which calculates +((2 + 3) * 2) + 1+. Notice that when the script contains several operators in a row, the stack allows the results of one operator to be acted upon by the next operator:
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2 3 OP_ADD 2 OP_MUL 1 OP_ADD 11 OP_EQUAL
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Try validating the script above yourself, using pencil and paper. When the script execution ends, you should be left with the value TRUE on the stack.
Try validating the preceding script yourself using pencil and paper. When the script execution ends, you should be left with the value TRUE on the stack.
While most locking scripts refer to a bitcoin address or public key, thereby requiring proof of ownership to spend the funds, the script does not have to be that complex. Any combination of locking and unlocking scripts that results in a TRUE value is valid. The simple arithmetic we used as an example of the scripting language above is also a valid locking script that can be used to lock a transaction output.
Although most locking scripts refer to a bitcoin address or public key, thereby requiring proof of ownership to spend the funds, the script does not have to be that complex. Any combination of locking and unlocking scripts that results in a TRUE value is valid. The simple arithmetic we used as an example of the scripting language is also a valid locking script that can be used to lock a transaction output.
Use part of the arithmetic example script as the locking script:
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@ -327,7 +327,7 @@ The validation software combines the locking and unlocking scripts and the resul
2 3 OP_ADD 5 OP_EQUAL
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As we saw in the step-by-step example above, when this script is executed the result is OP_TRUE, making the transaction valid. Not only is this a valid transaction output locking script, but the resulting UTXO could be spent by anyone with the arithmetic skills to know that the number 2 satisfies the script.
As we saw in the step-by-step example in Figure 5-2, when this script is executed the result is +OP_TRUE+, making the transaction valid. Not only is this a valid transaction output locking script, but the resulting UTXO could be spent by anyone with the arithmetic skills to know that the number 2 satisfies the script.
[TIP]
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