Bitcoin: What if someone locks some bitcoin with a script that only requires the user to know the preview image, but it matches the p2sh template? [duplicate]

Potential Vulnerability in Lightning Network HTLC

As more and more people delve into the world of Bitcoin and Lightning Network (LN) transactions, the security and reliability of these systems has become an increasingly important topic of discussion. One area that has sparked curiosity is how to create a trusted execution environment for Lightning Network transactions using the Hash-Address-Pubkey (p2sh) script pattern, also known as HTLC.

However, there is a potential flaw in this setup that could compromise the security of these transactions. In this article, we will explore what happens when someone locks Bitcoin with a script that only requires the user to know the image but follows the p2sh pattern.

Basics of the Hash-Address-Pubkey (p2sh) script pattern

Before we explore the potential vulnerability, let’s quickly review how HTLC works. In a Lightning Network transaction, multiple users can “lock” Bitcoin by creating a script that includes the public key and a hash of a certain value. This public key is used to confirm the block, and when a user attempts to spend the blocked funds, they must know the hash (i.e., the initial value) associated with their public key.

The HTLC output uses the p2sh model, which provides a secure way to transfer Bitcoin from one wallet to another. The basic syntax of the p2sh model is as follows: