flywithu/Learning-Bitcoin-from-the-Command-Line
1
1
Fork 0
mirror of https://github.com/ChristopherA/Learning-Bitcoin-from-the-Command-Line.git synced 2025-06-05 23:16:12 +00:00
Code Issues Releases Wiki Activity

Correct syntax error

Browse Source 
The question feels odd using the `What` question word and the
following paragraph fits better with the `Why` question word.
This commit is contained in:
Cesar Alvarez Vallero 2021-08-13 23:14:09 -03:00
parent 57cf4e7600
commit 92f86fa393
No known key found for this signature in database
GPG Key ID: 8DEF166DA59D7898
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
09_5_Scripting_a_P2WPKH.md
View File

@ -96,7 +96,7 @@ script | sta
```
Bitcoin Scripts are considered successful if there's something in the Stack, and it's non-zero, so SegWit scripts automatically succeed on old nodes as long as the `scriptPubKey` is correctly created with a non-zero pub-key hash. This is called an "anyone-can-spend" transaction, because old nodes verified them as correct without any need for signatures.
> :book: ***What can't old nodes steal SegWit UTXOs?*** SegWit was enabled on the Bitcoin network when 95% of miners signalled that they were ready to start using it. That means that only 5% of nodes at that point might have registered anyone-can-spend SegWit transactions as valid without going through the proper work of checking the `txinwitness`. If they incorrectly incorporated an invalid anyone-can-spend UTXO into a block, the other 95% of nodes would refuse to validate that block, and so it would quickly be orphaned rather than being added to the "main" blockchain. (Certainly, 51% of nodes could choose to stop interpreting SegWit transactions correctly, but 51% of nodes can do anything on a consensus network like a blockchain.)
> :book: ***Why can't old nodes steal SegWit UTXOs?*** SegWit was enabled on the Bitcoin network when 95% of miners signalled that they were ready to start using it. That means that only 5% of nodes at that point might have registered anyone-can-spend SegWit transactions as valid without going through the proper work of checking the `txinwitness`. If they incorrectly incorporated an invalid anyone-can-spend UTXO into a block, the other 95% of nodes would refuse to validate that block, and so it would quickly be orphaned rather than being added to the "main" blockchain. (Certainly, 51% of nodes could choose to stop interpreting SegWit transactions correctly, but 51% of nodes can do anything on a consensus network like a blockchain.)
Because old nodes always see SegWit scripts as correct, they will always verify them, even without understanding their content.