Labs / Blockchain Secrets
- Daily Challenge
- Released 10 Jul 2025
The lab needs to be started first.
Step 1: Click on the green button to Start the Lab
Step 2: Hack the URL or IP of the lab
Step 3: Use your skills and logic to find the flags!
Need help to start?
Daily Challenge
Blockchain Secrets - Challenge Description
Challenge Overview
Welcome to Blockchain Secrets! In this challenge, you'll analyze a Bitcoin transaction that contains hidden data. The transaction appears normal at first glance, but careful examination of the transaction scripts reveals a hidden message encoded using blockchain data embedding techniques.
Learning Objectives
- Understand Bitcoin transaction structure and components
- Learn about OP_RETURN and data embedding in blockchain
- Practice hexadecimal decoding and data extraction
- Develop skills in blockchain forensic analysis
Challenge Details
You are provided with a Bitcoin transaction JSON file. The transaction contains an OP_RETURN output that embeds hidden data. Your task is to analyze the transaction structure, identify the data-embedding output, decode the hidden information, and extract the flag (in UUID format).