Skip to content

Instantly share code, notes, and snippets.

View l0rinc's full-sized avatar

l0rinc l0rinc

108 followers · 12 following
View GitHub Profile
@l0rinc
l0rinc / bip110_cache_poisoning.md
Created February 13, 2026 11:30
Script-execution cache poisoning via activation-boundary reorg

Script-execution cache poisoning via activation-boundary reorg

Disclaimer

It's no secret that I'm strongly opposed to this consensus change (trying to punish everyone just to send a signal to those we disagree with doesn't resonate with me).

But regardless of my views on it, I think it's important to disclose a serious consensus-critical bug in the current BIP-110 implementation, since it could harm users who choose to run this software even more.

Context

The new restrictions here don't apply to UTXOs created before the activation height. This is tracked via per-input flags that relax the mandatory verify flags for old UTXOs.

@l0rinc
l0rinc / Cheap RPI 5 nodes
Last active October 2, 2025 22:09
Pi 5, 4 GB, pruned node:
• Raspberry Pi 5 (4 GB RAM) - $66 - https://amazon.com/Raspberry-Pi-4GB-2023-Processor/dp/B0CK3L9WD3
• 128 GB NVMe SSD - $20 - https://www.amazon.com/Silicon-Power-128GB-P34A60-SP128GBP34A60M28/dp/B09HMWH1DG
• M.2 HAT for SSD - $8 - https://amazon.com/ZDE-ZP517A-Peripheral-Raspberry-Compatible/dp/B0D1QYDJJJ
• Aluminum heatsink - $4 - https://amazon.com/Raspberry-Aluminum-Heatsink-Cooling-Dissipation/dp/B0DY83ZZ31
• 5.1 V/5 A power supply - $13 - https://www.amazon.com/RasTech-Power-Supply-Raspberry-Adapter/dp/B0CLV6WB4L
Total: $111
----
@l0rinc
l0rinc / GetLegacySigOpCount.patch
Created May 17, 2025 15:12
[PATCH] Add paranoid sanity checks
diff --git a/src/script/script.cpp b/src/script/script.cpp
--- a/src/script/script.cpp (revision 6ddb22a8c89a40ec0d4d75a195c2bc0231933285)
+++ b/src/script/script.cpp (revision b34e14355d94b21064cc64977955bf696e09992e)
@@ -4,7 +4,8 @@
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <script/script.h>
-
+#include <script/solver.h>
+#include <logging.h>
@l0rinc
l0rinc / benchmark.md
Last active March 24, 2025 11:27
Benchmarking meeting notes

Benchmarking meeting notes

Add a macro benchmark suite with longer-running operations, exercising a different set of functionality that is performance-critical.

  • One of them could be the speed of an assumeUTXO load-and-dump (this would check block read/write and (de)serialization, but only part of validation).
  • Another one could be an actual IBD for 840-880k blocks (small part of IBD, but should produce a representative comparison quickly).
  • Another one would be a reindex-chainstate up to e.g. 880k blocks (more realistic, but takes long and doesn't involve reading/writing blocks).
  • Lastly, several full IBDs to make sure the previous quick checks are representative (likely only required for big changes). We don't have to run all of these for every PR; it could be tied to labels added to PRs where the author/reviewers think they're relevant (e.g., not for doc typo fixes). This would require integration with CoreCheck.

Other suggested macro benchmarks by the participants:

  • Compact block reconstruction
@l0rinc
l0rinc / Dump stale blocks
Last active January 30, 2025 10:11
Dump stale blocks
#!/bin/bash
# Set up the working directory and output folder
DATADIR="/mnt/bitcoin-data"
OUTPUT_DIR="$DATADIR/stale_blocks"
LOG_FILE="$OUTPUT_DIR/stale_blocks.csv"
mkdir -p "$OUTPUT_DIR"
while read -r bhash; do
# Fetch block information (height and hash) and skip if unavailable
@l0rinc
l0rinc / benchmark.md
Last active August 25, 2025 23:22
Bitcoin Core benchmark for https://github.com/bitcoin/bitcoin/pull/31144

This guide helps you compare the performance of two different versions of Bitcoin Core during the initial block download (IBD) process. You will run two builds and share the results.

Background and Purpose

I am working on improving the performance of the first phase of Bitcoin Core, specifically the process of downloading and validating the blockchain on a fresh machine. I have proposed several modifications that, based on my own measurements, result in measurable speed improvements. However, to ensure broader acceptance, I need help reproducing these results by having others run similar tests.

This is a technical process (though not overly complex, in my opinion), requiring the source code to be compiled. The goal is to validate these improvements on multiple setups and environments, which will help accelerate their adoption.

Requirements:

@l0rinc
l0rinc / benchmark.md
Last active January 13, 2025 14:26
Bitcoin Core benchmark for https://github.com/bitcoin/bitcoin/pull/31144

Ez az útmutató segít abban, hogy összehasonlítsd a Bitcoin Core két különböző verziójának teljesítményét az első blokklánc-letöltési (IBD) folyamat során. Két buildet fogsz futtatni, és az eredményeket megoszthatod.

Kell hozzá:

  • GitHub fiók (az eredmények publikálásához).
  • Linux alapú rendszer (például Ubuntu/Debian).
  • Legalább 1 TB szabad hely a blokklánc adataihoz (ideiglenes, utána törölhető).

Először telepítsd a szükséges csomagokat (Debian/Ubuntu rendszeren). Csak megbízható forrásból telepíts!




  


  





    


          
    

      

        
        

          

              @l0rinc
          

          

            
                l0rinc
                / xor_histogram_860k.py
            
            

              Last active
              November 13, 2024 13:48
            

              
                The histogram represents util::Xor method's write.size() histograms for the first 860k blocks, aggregated using: `awk '{ count[$1]++ } END { for (val in count) { printf "(%s, %.0f),\n", val, count[val] } }' histogram.txt`
              
          

        

      

        


      

        

      This file has been truncated, but you can view the full file.
    


    


        



  


  

        

          
          #!/usr/bin/env python3
        

        

          
          

        

        

          
          import tarfile
        

        

          
          import io
        

        

          
          from io import BytesIO
        

        

          
          

        

        

          
          def convert_to_binary():
        

        

          
              # Raw histogram data as (size, count) pairs
        

        

          
              histogram = [
        

        

          
                  (1, 47584838861),
        

  





    


  





    


          
    

      

        
        

          

              @l0rinc
          

          

            
                l0rinc
                / gist:3da714613283763e9464cb0011a9f732
            
            

              Created
              August 26, 2024 14:32
            

          

        

      

        


      

    
    


        



  


  

        

          
          Subject: [PATCH] Exclude `incomin&amp;g` from lint-spelling
        

        

          
          

        

        

          
          Before:
        

        

          
           % test/lint/lint-spelling.py
        

        

          
          src/qt/forms/optionsdialog.ui:345: incomin ==> incoming
        

        

          
          

        

        

          
          After:
        

        

          
           % test/lint/lint-spelling.py
        

        

          
          

        

  





    


  





    


          
    

      

        
        

          

              @l0rinc
          

          

            
                l0rinc
                / .diff
            
            

              Created
              August 21, 2024 11:14
            

              
                488887ce32aaed65d395e329d9093596e7c2e733
              
          

        

      

        


      

    
    


        



  


  

        

          
          Subject: [PATCH] TODO
        

        

          
          ---
        

        

          
          Index: src/test/util_tests.cpp
        

        

          
          IDEA additional info:
        

        

          
          Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
        

        

          
          <+>UTF-8
        

        

          
          ===================================================================
        

        

          
          diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
        

        

          
          --- a/src/test/util_tests.cpp	(revision 8b13872aa2960e66e0bf8542fcb5b8dda68c5d8c)
        

        

          
          +++ b/src/test/util_tests.cpp	(date 1724237518191)