Avatar

Labs / Blockchain Secrets

  • Daily Challenge
  • Released 10 Jul 2025

Blockchain Secrets

Start the machine, hack the system, and find the hidden flags to complete this challenge and earn points!

1
Flags
1
Points
Daily Challenge
Solution Available
Pro Exclusive
Start Lab Environment
~1-2 min setup
AWS dedicated
Private instance
Industry standard
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).