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Update 7_3_Scripting_a_P2PKH.md

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@ -35,6 +35,7 @@ Script: OP_DUP OP_HASH160 <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG
Stack: [ <signature> <pubKey> ] Stack: [ <signature> <pubKey> ]
Script: OP_HASH160 <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG Script: OP_HASH160 <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG
Running: <pubKey> OP_DUP
Stack: [ <signature> <pubKey> <pubKey> ] Stack: [ <signature> <pubKey> <pubKey> ]
``` ```
Why the duplicate? Because that's what's required by the script! Why the duplicate? Because that's what's required by the script!
@ -42,6 +43,7 @@ Why the duplicate? Because that's what's required by the script!
Next, `OP_HASH160` pops the `<pubKey>` off the stack, hashes it, and puts the result back on the stack. Next, `OP_HASH160` pops the `<pubKey>` off the stack, hashes it, and puts the result back on the stack.
``` ```
Script: <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG Script: <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG
Running: <pubKey> OP_HASH160
Stack: [ <signature> <pubKey> <pubKeyHash> ] Stack: [ <signature> <pubKey> <pubKeyHash> ]
``` ```
Then, you place the `<pubKeyHash>` that was in the locking script on the stack: Then, you place the `<pubKeyHash>` that was in the locking script on the stack:
@ -54,11 +56,13 @@ Stack: [ <signature> <pubKey> <pubKeyHash> <pubKeyHash> ]
Assuming the two `<pubKeyHash>es` are equal, you will have the following result: Assuming the two `<pubKeyHash>es` are equal, you will have the following result:
``` ```
Script: OP_CHECKSIG Script: OP_CHECKSIG
Running: <pubKeyHash> <pubKeyHash> OP_EQUALVERIFY
Stack: [ <signature> <pubKey> ] Stack: [ <signature> <pubKey> ]
``` ```
At this point you've proven that the `<pubKey>` supplied in the `scriptSig` hashes to the Bitcoin address in question, so you know that the redeemer knew the public key. They just need to prove knowledge of the private key, which is done with `OP_CHECKSIG`, which confirms that the unlocking script's signature matches that public key. At this point you've proven that the `<pubKey>` supplied in the `scriptSig` hashes to the Bitcoin address in question, so you know that the redeemer knew the public key. They just need to prove knowledge of the private key, which is done with `OP_CHECKSIG`, which confirms that the unlocking script's signature matches that public key.
``` ```
Script: Script:
Running: <signature> <pubKey> OP_CHECKSIG
Stack: [ True ] Stack: [ True ]
``` ```
The Script now ends and the transaction is allowed to respend the UTXO in question. The Script now ends and the transaction is allowed to respend the UTXO in question.