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Update 7_2_Running_a_Bitcoin_Script.md

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Shannon Appelcline 2017-06-01 11:50:41 -07:00 committed by GitHub
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7_2_Running_a_Bitcoin_Script.md
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@ -42,6 +42,7 @@ When a Bitcoin Script encounters an operator, it evaluates it. Each operator pop
OP_ADD pops two items off the stack (here: 2 then 1), adds then together, and pushes the result back on the stack (here: 3). OP_ADD pops two items off the stack (here: 2 then 1), adds then together, and pushes the result back on the stack (here: 3).
``` ```
Script: Script:
Running: 1 2 OP_ADD
Stack: [ 3 ] Stack: [ 3 ]
``` ```
@ -59,12 +60,14 @@ Script: OP_ADD 4 OP_SUB
Stack: [ 3 2 ] Stack: [ 3 2 ]
Script: 4 OP_SUB Script: 4 OP_SUB
Running: 3 2 OP_ADD
Stack: [ 5 ] Stack: [ 5 ]
Script: OP_SUB Script: OP_SUB
Stack: [ 5 4 ] Stack: [ 5 4 ]
Script: Script:
Running: 5 4 OP_SUB
Stack: [ 1 ] Stack: [ 1 ]
``` ```
@ -90,12 +93,14 @@ Script: OP_ADD 99 OP_EQUAL
Stack: [ 1 98 ] Stack: [ 1 98 ]
Script: 99 OP_EQUAL Script: 99 OP_EQUAL
Running: 1 98 OP_ADD
Stack: [ 99 ] Stack: [ 99 ]
Script: OP_EQUAL Script: OP_EQUAL
Stack: [ 99 99 ] Stack: [ 99 99 ]
Script: Script:
Running: 99 99 OP_EQUAL
Stack: [ True ] Stack: [ True ]
``` ```
This abstraction isn't quite accurate: for security reasons, the `scriptSig` is run, then the contents of the stack are transferred for the `scriptPubKey` to run, but it's accurate enough for understanding how the key of `scriptSig` fits into the lock of `scriptPubKey`. This abstraction isn't quite accurate: for security reasons, the `scriptSig` is run, then the contents of the stack are transferred for the `scriptPubKey` to run, but it's accurate enough for understanding how the key of `scriptSig` fits into the lock of `scriptPubKey`.