Awesome OP_CAT

A curated list of resources related to OP_CAT on Bitcoin

• Awesome OP_CAT
  • References
  • Articles
    • Introductions
    • Technical
    • OP_CAT Use Cases
  • Videos and Podcasts
  • Applications
  • Communities
  • Testnets
  • Contributing

References

• BIP-347

Articles

Introductions

• What Is OP_CAT: The One Opcode That Could Unlock Bitcoin’s Next Era
• What Is Bitcoin OP_CAT? The Opcode Explained by Bitcoin.com
• OP_CAT: The Key to Bitcoin’s Future Dominance?
• What is OP_CAT?
• OP_CAT: The Missing Piece for BTC L2s?
• What is OP_CAT
• Satsie's Pocket Guide to OP_CAT
• Return of the CAT
• Understanding the OP_CAT soft fork: by BlockBeats CN version
• Why Should You Care About Bitcoin’s OP_CAT? The Biggest Narrative After Lightning Network: by BlockBeats CN version
• OP_CAT: The Opcode That Could Make Bitcoin Purr: by bitfinity
• Bitcoin’s Next Major Upgrade? An Assessment of OP_CAT & OP_CTV: by Galaxy Research
• OP_CAT is Satoshi's invention: by CoinDesk

Technical

• CAT and Schnorr Tricks I
• OP_CAT: The Purr-fect Solution for Covenants?
• OP_CAT from Bitcoin Optech
• OP_CAT AND THE INFINITE NOTHING
• Scaling Bitcoin for mass use: A realistic vision by StarkWare: $1 million fund to support new research of OP_CAT on Bitcoin
• Balrogs and OP_CATs: The Bridge to Khaza-doom?
• TO MEME, OR NOT TO MEME: THE CAT
• LITTLE OL’ OP_CAT
• On Script Upgrades & OP_CAT
• Is OP_CAT Too Powerful?
• The path to general computation on Bitcoin (with OP_CAT): by StarkWare
• WTF is OP_CAT

OP_CAT Use Cases

• Series #1 (Covenants)
• Series #2 (Merkle Trees)
• Series #3 (Vaults)
• Series #4 (Recursive Covenants)
• Series #5 (Drivechain)

Videos and Podcasts

• Make Bitcoin Great Again with OP_CAT | Bitcoin Asia 2026
• Schrödinger's OP CAT: The Case For Concatenation on Bitcoin: Bitcoin MENA 2025
• Expanding Bitcoin's Utility with OP CAT: Liu at Bitcoin Asia 2025
• The Developer Who Revived Bitcoin’s Lost Code: OP_CAT: BITCOIN RAILS #36: The Birth Story of ‘OPCAT’ with proposal co-author Ethan Heilman
• OP_CAT | The Ordinal Show
• Bitcoin's Next Upgrade? The Power of OP_CAT: April 2025 in Hong Kong
• OP_CAT with sCrypt | The Ordinal Show
• OP_CAT with sCrypt | Emblem Vault
• OP_CAT and Its Use Cases by sCrypt at BitLayers
• Bitcoin's Smart Contract Revolution: OP_CAT Explained by sCrypt: part 1
• OP_CAT Unleashed: Revolutionizing Bitcoin with Smart Contracts and DApps - sCrypt: part 2
• Cat is out of the bag?
• OP_CAT & Bitcoin Ossification With Blockstream’s Andrew Poelstra
• Andrew Poelstra on Covenants (OP_CAT vs OP_CTV)
• MEV & OP_CAT Panel
• Is OP_CAT Bullish or Bearish for Bitcoin? | sCrypt interviewed by Francis Dhun
• Unlocking Expressivity With OP CAT
• sCrypt Unveils OP_CAT Potential in Silicon Valley Seminar
• Is OP_CAT Bringing MEV to Bitcoin? at Bitcoin Vegas 2025
• Orange Pilling Crypto With Cats and Wizards | With Udi Wertheimer
• OP_Cat, Bitcoin MEV, and Scaling Bitcoin With Post Capone on GWART POD

Applications

• CAT Protocol: miner validated tokens
• covenants
• Merkle trees
• purrfect_vault by taproot-wizards
• vault by sCrypt
• recursive covenant 1: counter
• recursive covenant 2: counter
• STARK Verifier
• CatVM: Universal fine-state machine through OP_CAT
• What the heck is CatVM? - Bitcoin Magazine
• OP_CAT: A Big Step towards Bitcoin Contracts, From Vault to General Computing | Bitlayer
• Lamport signatures
• CATful contract collection: a collection of CATful Bitcoin smart contracts written in sCrypt

Communities

• OP_CAT builders: Telegram group for technical discussions
• Stackoverflow
• DelvingBitcoin
• Developer survey on OP_CAT and other covenant proposals

Live OP_CAT networks

• OP_CAT Layer: Bitcoin execution layer
• Signet: OP_CAT enabled
• Fractal: OP_CAT enabled since launch in Sept 2024
• CatNet: a custom Bitcoin signet with OP_CAT enabled

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Contributing

All contributions are welcome. Feel free to open PRs to add new content or categories.