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Update 7_1_Understanding_the_Foundation_of_Transactions.md

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@ -103,6 +103,34 @@ That in turn is the standard method in Bitcoin Script for locking a P2PKH transa
[7.3: Scripting a Pay to Public Key Hash](7_3_Scripting_a_Pay_to_Public_Key_Hash.md) explains how these go together, but first you need to know how Bitcoin Scripts are evaluated.
## Examine a Different Sort of Transaction
Here's the `scriptPubKey` from your new P2PKH transaction:
```
"scriptPubKey": {
"asm": "OP_DUP OP_HASH160 371c20fb2e9899338ce5e99908e64fd30b789313 OP_EQUALVERIFY OP_CHECKSIG",
"hex": "76a914371c20fb2e9899338ce5e99908e64fd30b78931388ac",
"reqSigs": 1,
"type": "pubkeyhash",
"addresses": [
"mkYMA2i2vzEXjoDn4GfvPoFr3MJ62uUtMx"
]
}
```
Here's the `scriptPubKey` from the multisig transaction that you created in §6.2:
```
"scriptPubKey": {
"asm": "OP_HASH160 babf9063cee8ab6e9334f95f6d4e9148d0e551c2 OP_EQUAL",
"hex": "a914babf9063cee8ab6e9334f95f6d4e9148d0e551c287",
"reqSigs": 1,
"type": "scripthash",
"addresses": [
"2NAGfA4nW6nrZkD5je8tSiAcYB9xL2xYMCz"
]
}
```
Note that these two transactions are definitely locked in different ways. Bitcoin recognises the first as `pubkeyhash` (P2PKH) and second as `scripthash` (P2SH), but you should also be able to see the difference in the different `asm` code: `OP_DUP OP_HASH160 371c20fb2e9899338ce5e99908e64fd30b789313 OP_EQUALVERIFY OP_CHECKSIG` versus `OP_HASH160 babf9063cee8ab6e9334f95f6d4e9148d0e551c2 OP_EQUAL`. This is the power of scripting: it can quite simply produce some of the dramatically different sorts of transactions that you learned about in the previous chapters of the book.
## Summary: Understanding the Foundation of Transactions
Every Bitcoin transaction includes at least one unlocking script (`scriptPubKey`), which solves a previous cryptographic puzzle, and at least one locking script (`scriptPubKey`), which creates a new cryptographic puzzle. There's one per input and one per output. Each of these scripts is written in Bitcoin Script, a Forth-like language that further empowers Bitcoin.
Every Bitcoin transaction includes at least one unlocking script (`scriptSiG`), which solves a previous cryptographic puzzle, and at least one locking script (`scriptPubKey`), which creates a new cryptographic puzzle. There's one `scriptSig` per input and one `scriptPubKey` per output. Each of these scripts is written in Bitcoin Script, a Forth-like language that further empowers Bitcoin.