mirror of
https://github.com/ChristopherA/Learning-Bitcoin-from-the-Command-Line.git
synced 2025-06-07 16:06:26 +00:00
updating for btcdeb and 0.20
This commit is contained in:
Shannon Appelcline
GitHub
parent
6ebd68d5bc
commit
ad6ca44dd4
@ -1,4 +1,4 @@
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# 11.1: Writing Puzzle Scripts
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# 13.1: Writing Puzzle Scripts
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> :information_source: **NOTE:** This is a draft in progress, so that I can get some feedback from early reviewers. It is not yet ready for learning.
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> :information_source: **NOTE:** This is a draft in progress, so that I can get some feedback from early reviewers. It is not yet ready for learning.
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@ -6,7 +6,7 @@ Bitcoin Scripts _don't_ actually have to depend on the knowledge of a secret key
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## Write Simple Algebra Scripts
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## Write Simple Algebra Scripts
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Our first real Script, from [§7.2: Running a Bitcoin Script](07_2_Running_a_Bitcoin_Script.md) was an alegbraic puzzle. That Bitcoin Script, `OP_ADD 99 OP_EQUAL`, could have been alternatively described as `x + y = 99`.
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Our first real Script, from [§9.2: Running a Bitcoin Script](09_2_Running_a_Bitcoin_Script.md) was an alegbraic puzzle. That Bitcoin Script, `OP_ADD 99 OP_EQUAL`, could have been alternatively described as `x + y = 99`.
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This sort of Script doesn't have a lot of applicability in the real world, as it's too easy to claim the funds. But, a puzzle-solving contest giving out Bitcoin dust might offer it as a fun entertainment.
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This sort of Script doesn't have a lot of applicability in the real world, as it's too easy to claim the funds. But, a puzzle-solving contest giving out Bitcoin dust might offer it as a fun entertainment.
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@ -58,13 +58,128 @@ Script:
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Running: 13 13 OP_EQUAL
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Running: 13 13 OP_EQUAL
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Stack: [ True ]
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Stack: [ True ]
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```
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```
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See also the [WebBTC Debug Execution](https://webbtc.com/script/2/OP_DUP%20OP_DUP%207%20OP_ADD%20OP_ADD%20OP_ADD%2013%20OP_EQUAL/) of this script.
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Or if you prefer `btcdeb`:
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```
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$ btcdeb '[2 OP_DUP OP_DUP 7 OP_ADD OP_ADD OP_ADD 13 OP_EQUAL]'
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btcdeb 0.2.19 -- type `btcdeb -h` for start up options
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valid script
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9 op script loaded. type `help` for usage information
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script | stack
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---------+--------
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2 |
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OP_DUP |
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OP_DUP |
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7 |
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OP_ADD |
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OP_ADD |
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OP_ADD |
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13 |
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OP_EQUAL |
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#0000 2
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btcdeb> step
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<> PUSH stack 02
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script | stack
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---------+--------
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OP_DUP | 02
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OP_DUP |
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7 |
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OP_ADD |
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OP_ADD |
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OP_ADD |
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13 |
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OP_EQUAL |
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#0001 OP_DUP
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btcdeb> step
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<> PUSH stack 02
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script | stack
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---------+--------
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OP_DUP | 02
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7 | 02
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OP_ADD |
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OP_ADD |
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OP_ADD |
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13 |
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OP_EQUAL |
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#0002 OP_DUP
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btcdeb> step
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<> PUSH stack 02
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script | stack
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---------+--------
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7 | 02
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OP_ADD | 02
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OP_ADD | 02
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OP_ADD |
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13 |
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OP_EQUAL |
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#0003 7
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btcdeb> step
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<> PUSH stack 07
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script | stack
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---------+--------
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OP_ADD | 07
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OP_ADD | 02
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OP_ADD | 02
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13 | 02
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OP_EQUAL |
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#0004 OP_ADD
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btcdeb> step
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<> POP stack
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<> POP stack
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<> PUSH stack 09
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script | stack
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---------+--------
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OP_ADD | 09
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OP_ADD | 02
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13 | 02
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OP_EQUAL |
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#0005 OP_ADD
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btcdeb> step
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<> POP stack
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<> POP stack
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<> PUSH stack 0b
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script | stack
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---------+--------
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OP_ADD | 0b
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13 | 02
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OP_EQUAL |
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#0006 OP_ADD
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btcdeb> step
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<> POP stack
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<> POP stack
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<> PUSH stack 0d
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script | stack
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---------+--------
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13 | 0d
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OP_EQUAL |
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#0007 13
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btcdeb> step
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<> PUSH stack 0d
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script | stack
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---------+--------
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OP_EQUAL | 0d
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| 0d
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#0008 OP_EQUAL
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btcdeb> step
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<> POP stack
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<> POP stack
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<> PUSH stack 01
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script | stack
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---------+--------
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```
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### Write an Equation System
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### Write an Equation System
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What if you wanted to instead write an equation system, such as `x + y = 3`, `y + z = 5`, and `x + z = 4`? A bit of algebra tells you that the answers come out to `x = 1`, `y = 2`, and `z = 3`. But, how do you script it?
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What if you wanted to instead write an equation system, such as `x + y = 3`, `y + z = 5`, and `x + z = 4`? A bit of algebra tells you that the answers come out to `x = 1`, `y = 2`, and `z = 3`. But, how do you script it?
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Most obviously, after the redeemer inputs the three numbers, we're going to need two copies of each numbers, since each number goes into two different equations. `OP_3DUP` takes care of that and results in `x y z x y z` being on the stack. Popping off two items at a time will give us `y z`, `z x`, and `x y`. Voila! That's our three equations, so we just need to add them up and test them in the right order! Here's the full script: `OP_3DUP OP_ADD 5 OP_EQUALVERIFY OP_ADD 4 OP_EQUALVERIFY OP_ADD 3 OP_EQUAL`.
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Most obviously, after the redeemer inputs the three numbers, you're going to need two copies of each numbers, since each number goes into two different equations. `OP_3DUP` takes care of that and results in `x y z x y z` being on the stack. Popping off two items at a time will give you `y z`, `z x`, and `x y`. Voila! That's the three equations, so you just need to add them up and test them in the right order! Here's the full script: `OP_3DUP OP_ADD 5 OP_EQUALVERIFY OP_ADD 4 OP_EQUALVERIFY OP_ADD 3 OP_EQUAL`.
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Here's how it runs with the correct unlocking script of `1 2 3`:
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Here's how it runs with the correct unlocking script of `1 2 3`:
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```
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```
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@ -111,9 +226,204 @@ Script:
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Running: 3 3 OP_EQUAL
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Running: 3 3 OP_EQUAL
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Stack: [ True ]
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Stack: [ True ]
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```
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```
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See also the [WebBTC Debug Execution](https://webbtc.com/script/1%202%203/OP_3DUP%20OP_ADD%205%20OP_EQUALVERIFY%20OP_ADD%204%20OP_EQUALVERIFY%20OP_ADD%203%20OP_EQUAL/) of this script.
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Here it is in `btcdeb`:
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```
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$ btcdeb '[1 2 3 OP_3DUP OP_ADD 5 OP_EQUALVERIFY OP_ADD 4 OP_EQUALVERIFY OP_ADD 3 OP_EQUAL]'
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btcdeb 0.2.19 -- type `btcdeb -h` for start up options
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valid script
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13 op script loaded. type `help` for usage information
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script | stack
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---------------+--------
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1 |
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2 |
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3 |
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OP_3DUP |
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OP_ADD |
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5 |
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OP_EQUALVERIFY |
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OP_ADD |
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4 |
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OP_EQUALVERIFY |
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OP_ADD |
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3 |
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OP_EQUAL |
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> :warning: **WARNING** The WebBTC Debugger was used not just to offer another visualization of these scripts, but to also double-check the results. Sure enough, we got this one wrong the first time, testing the equations in the wrong order. That's how easy it is to make a financially fatal mistake in a Bitcoin Script, and that's why every script must be tested.
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#0000 1
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btcdeb> step
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<> PUSH stack 01
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script | stack
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---------------+--------
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2 | 01
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3 |
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OP_3DUP |
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OP_ADD |
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5 |
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OP_EQUALVERIFY |
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OP_ADD |
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4 |
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OP_EQUALVERIFY |
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OP_ADD |
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3 |
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OP_EQUAL |
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#0001 2
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btcdeb> step
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<> PUSH stack 02
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script | stack
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---------------+--------
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3 | 02
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OP_3DUP | 01
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OP_ADD |
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5 |
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OP_EQUALVERIFY |
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OP_ADD |
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4 |
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OP_EQUALVERIFY |
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OP_ADD |
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3 |
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OP_EQUAL |
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#0002 3
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btcdeb> step
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<> PUSH stack 03
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script | stack
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---------------+--------
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OP_3DUP | 03
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OP_ADD | 02
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5 | 01
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OP_EQUALVERIFY |
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OP_ADD |
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4 |
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OP_EQUALVERIFY |
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OP_ADD |
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3 |
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OP_EQUAL |
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#0003 OP_3DUP
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btcdeb> step
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<> PUSH stack 01
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<> PUSH stack 02
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<> PUSH stack 03
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script | stack
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---------------+--------
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OP_ADD | 03
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5 | 02
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OP_EQUALVERIFY | 01
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OP_ADD | 03
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4 | 02
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OP_EQUALVERIFY | 01
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OP_ADD |
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3 |
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OP_EQUAL |
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#0004 OP_ADD
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btcdeb> step
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<> POP stack
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<> POP stack
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<> PUSH stack 05
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script | stack
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---------------+--------
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5 | 05
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OP_EQUALVERIFY | 01
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OP_ADD | 03
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4 | 02
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OP_EQUALVERIFY | 01
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OP_ADD |
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3 |
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OP_EQUAL |
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#0005 5
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btcdeb> step
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<> PUSH stack 05
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script | stack
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---------------+--------
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OP_EQUALVERIFY | 05
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OP_ADD | 05
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4 | 01
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OP_EQUALVERIFY | 03
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OP_ADD | 02
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3 | 01
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OP_EQUAL |
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#0006 OP_EQUALVERIFY
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btcdeb> step
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<> POP stack
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<> POP stack
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<> PUSH stack 01
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<> POP stack
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script | stack
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---------------+--------
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OP_ADD | 01
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4 | 03
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OP_EQUALVERIFY | 02
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OP_ADD | 01
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3 |
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OP_EQUAL |
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#0007 OP_ADD
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btcdeb> step
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<> POP stack
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<> POP stack
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<> PUSH stack 04
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script | stack
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---------------+--------
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4 | 04
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OP_EQUALVERIFY | 02
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OP_ADD | 01
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3 |
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OP_EQUAL |
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#0008 4
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btcdeb> step
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<> PUSH stack 04
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script | stack
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---------------+--------
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OP_EQUALVERIFY | 04
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OP_ADD | 04
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3 | 02
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OP_EQUAL | 01
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#0009 OP_EQUALVERIFY
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btcdeb> step
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<> POP stack
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<> POP stack
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<> PUSH stack 01
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<> POP stack
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script | stack
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---------------+--------
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OP_ADD | 02
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3 | 01
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OP_EQUAL |
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#0010 OP_ADD
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btcdeb> step
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<> POP stack
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<> POP stack
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<> PUSH stack 03
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script | stack
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---------------+--------
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3 | 03
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OP_EQUAL |
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#0011 3
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btcdeb> step
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<> PUSH stack 03
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script | stack
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---------------+--------
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OP_EQUAL | 03
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| 03
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#0012 OP_EQUAL
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btcdeb> step
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<> POP stack
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<> POP stack
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<> PUSH stack 01
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script | stack
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---------------+--------
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```
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> :warning: **WARNING** `btcdeb` isn't just useful for providing visualization of these scripts, but to also double-check the results. Sure enough, we got this one wrong the first time, testing the equations in the wrong order. That's how easy it is to make a financially fatal mistake in a Bitcoin Script, and that's why every script must be tested.
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|
|
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## Write Simple Computational Scripts
|
## Write Simple Computational Scripts
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|
|
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@ -162,14 +472,19 @@ Stack: [ <hashB> <numA> ]
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Script: OP_EQUAL
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Script: OP_EQUAL
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Running: <numA> OP_SHA1
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Running: <numA> OP_SHA1
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Stack: [ <hashB> <hashA> ]
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Stack: [ <hashB> <hashA> ]
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```
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Finally, we see if they match.
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|
```
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Script:
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Script:
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Running: <hashB> <hashA> OP_EQUAL
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Running: <hashB> <hashA> OP_EQUAL
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Stack: [ True ]
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Stack: [ True ]
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```
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```
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This is a nice script because it shows careful use of logic (with the `OP_NOT` and the `OP_VERIFY`) and good use of stack functions (with the `OP_SWAP`). It's all around a great example of a real-world function. And it is very real-world. When [SHA-1 was broken](https://shattered.io/), 2.48 BTC were quickly liberated from the address, with a total value of almost $3,000.
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This is a nice script because it shows careful use of logic (with the `OP_NOT` and the `OP_VERIFY`) and good use of stack functions (with the `OP_SWAP`). It's all around a great example of a real-world function. And it is very real-world. When [SHA-1 was broken](https://shattered.io/), 2.48 BTC were quickly liberated from the address, with a total value of about $3,000 at the time.
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|
||||||
See also the [WebBTC Debug Execution](https://webbtc.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%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_2DUP%20OP_EQUAL%20OP_NOT%20OP_VERIFY%20OP_SHA1%20OP_SWAP%20OP_SHA1%20OP_EQUAL/), with the correct answers.
|
`btcdeb` can be run to prove the collision (and the script):
|
||||||
|
```
|
||||||
|
btcdeb $ btcdeb '[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 OP_2DUP OP_EQUAL OP_NOT OP_VERIFY OP_SHA1 OP_SWAP OP_SHA1 OP_EQUAL']
|
||||||
|
```
|
||||||
|
|
||||||
Peter Todd's other [bounties](https://bitcointalk.org/index.php?topic=293382.0) remain unclaimed at the time of this writing. They're all written in the same manner as the SHA-1 example above.
|
Peter Todd's other [bounties](https://bitcointalk.org/index.php?topic=293382.0) remain unclaimed at the time of this writing. They're all written in the same manner as the SHA-1 example above.
|
||||||
|
|
||||||
@ -189,8 +504,8 @@ Yet, Peter Todd's cryptographic bounties prove that puzzle scripts do have some
|
|||||||
|
|
||||||
Puzzles scripts are a great introduction to more realistic and complex Bitcoin Scripts. They demonstrate the power of the mathematical and stack functions in Bitcoin Script and how they can be carefully combined to create questions that require very specific answers. However, their real-world usage is also limited by the security issues inherent in non-signed Bitcoin transactions.
|
Puzzles scripts are a great introduction to more realistic and complex Bitcoin Scripts. They demonstrate the power of the mathematical and stack functions in Bitcoin Script and how they can be carefully combined to create questions that require very specific answers. However, their real-world usage is also limited by the security issues inherent in non-signed Bitcoin transactions.
|
||||||
|
|
||||||
_What is the power of puzzle script?_ Despite their limitations, puzzles scripts have been used in the real world as the prizes for computational bounties. Anyone who can figure out a complex puzzle, whose solution presumably has some real-world impact, can win the bounty. Whether they get to actually keep it is another question.
|
> :fire: ***What is the power of puzzle script?*** Despite their limitations, puzzles scripts have been used in the real world as the prizes for computational bounties. Anyone who can figure out a complex puzzle, whose solution presumably has some real-world impact, can win the bounty. Whether they get to actually keep it is another question.
|
||||||
|
|
||||||
## What's Next?
|
## What's Next?
|
||||||
|
|
||||||
Continue "Designing Real Bitcoin Scripts" with [§11.2: Writing Complex Multisig Scripts](11_2_Writing_Complex_Multisig_Scripts.md).
|
Continue "Designing Real Bitcoin Scripts" with [§13.2: Writing Complex Multisig Scripts](13_2_Writing_Complex_Multisig_Scripts.md).
|
||||||
|
|||||||
Loading…
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Reference in New Issue
Block a user