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Update 8_1_Understanding_the_Foundation_of_P2SH.md

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@ -78,6 +78,18 @@ You create hexcode by stepping through your locking script and turning each elem
* Larger constants are translated into 0x01 to 0x4e (OP_PUSHDATA, including a specification of how many bytes to push) * Larger constants are translated into 0x01 to 0x4e (OP_PUSHDATA, including a specification of how many bytes to push)
* Operators are translated to the matching byte for that opcode * Operators are translated to the matching byte for that opcode
The constants are the most troublesome part. Often you'll need to translate decimals into hexidecimals. This can be done with the `printf` command:
```
$ decimal=1546288031
$ hex=(printf '%x\n' $decimal)
$ echo $hex
5c2a7b9f
```
And you'll always need to know the size of your constants. You can just remember that every two hexidecimal characters is one byte. Or, you can use `echo -n` piped to `wc -c`, and divide that in two:
```
user1@blockstream:~$ echo -n $hex | wc -c
8
```
#### Create the Hex Code: A Multisig Example #### Create the Hex Code: A Multisig Example
It may be easier to understand this by taking an existing hexcode and translating it back to Bitcoin Script. For example, look at the `redeemScript` that you used [§6.1](6_1_Sending_a_Transaction_to_a_Multisig.md): It may be easier to understand this by taking an existing hexcode and translating it back to Bitcoin Script. For example, look at the `redeemScript` that you used [§6.1](6_1_Sending_a_Transaction_to_a_Multisig.md):