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Reading https://hfaresearch.substack.com/p/bitcoins-next-leap-w-catvm
TLDR 
The article discusses the CatVM, a new project by the Taproot Wizards, which aims to enhance Bitcoin’s capabilities by reintroducing the OP_CAT opcode to enable more advanced applications on the Bitcoin network.
Key Points 
- Bitcoin’s scripting language has limitations that prevent it from being Turing-complete and building complex applications.
- The CatVM project proposes using the OP_CAT opcode, which was originally part of Bitcoin but was disabled due to security concerns, to overcome these limitations.
- The CatVM would allow for trustless communication with off-chain Layer 2 solutions and the creation of advanced functionality on Bitcoin.
- The Quantum Cats NFT collection is being used to raise awareness and support for the OP_CAT upgrade.
In-depth Summary 
The article starts by introducing the Taproot Wizards, a group of Bitcoin developers who aim to “reignite the magic of Bitcoin” and make it “magical again.” They have launched the Taproot Wizards NFT collection and raised funds to assemble a team of developers to work on improving Bitcoin’s scalability and fostering cooperation among Bitcoin developers.
The article then delves into the limitations of Bitcoin’s scripting language, which has a linear execution model, lacks visibility into transaction data, and is poor at performing basic mathematical operations. These limitations have historically made it challenging to build complex applications on top of Bitcoin, unlike on platforms like Ethereum or Solana.
The article then introduces the CatVM, the Taproot Wizards’ inaugural project. The CatVM proposes using the OP_CAT opcode, which was originally part of Bitcoin but was disabled by Satoshi Nakamoto in 2010 due to security concerns, to overcome these limitations. The OP_CAT opcode, combined with Schnorr signatures introduced in the Taproot upgrade, would allow for the creation of trustless communication with off-chain Layer 2 solutions and the implementation of advanced functionality on Bitcoin.
The article also discusses the Quantum Cats NFT collection, which is being used to raise awareness and support for the OP_CAT upgrade. The collection has seen significant trading activity, with the floor price rising as the OP_CAT proposal gains traction.
While the OP_CAT upgrade is not a perfect solution and faces some pushback from those who want Bitcoin to remain rigid and unchanging, the article argues that it represents a balance of power and simplicity that could significantly enhance Bitcoin’s capabilities.
ELI5 
Bitcoin is like a special computer that can only do a few things, like sending and receiving money. The Taproot Wizards want to make Bitcoin do more cool things, like talking to other computers outside of Bitcoin. To do this, they want to bring back a special command called OP_CAT that was in Bitcoin before, but had to be turned off because it could be used in bad ways.
The OP_CAT command would let Bitcoin look inside its own transactions and do more advanced math, which would allow it to work with other computers and do more complex tasks. The Quantum Cats NFT collection is being used to get people excited about this idea and show that there’s a lot of interest in making Bitcoin more powerful.
Writer’s Main Point 
The main point of the article is to introduce the CatVM project and the Taproot Wizards’ efforts to enhance Bitcoin’s capabilities by reintroducing the OP_CAT opcode. This would allow for the creation of more advanced applications and functionality on the Bitcoin network, potentially reigniting the “magic” and innovation around the original cryptocurrency.
