OP_CAT could be pivotal for Bitcoin's future, pushing it beyond its original role as digital cash. Recent efforts by the Taproot Wizards, led by Eric Wall and Udi Wertheimer, aim to revive this opcode.


The Quantum Cats Ordinals project involves creating 3,333 evolving NFTs featuring cats. This initiative is designed to encourage NFT owners to support the adoption of OP_CAT.

The reintroduction of OP_CAT could open up new possibilities, such as establishing a secure link between Bitcoin and a layer 2 with zero knowledge, enabling the development of smart contracts on the Bitcoin blockchain. Additionally, OP_CAT might enable post-quantum signatures and introduce conventions to limit Bitcoin use in specific ways.

However, the process of reintroducing OP_CAT is intricate and involves creating a Bitcoin Improvement Proposal (BIP), coding, inclusion in Bitcoin clients, and persuading miners. Its reintroduction would mark a significant step in Bitcoin's evolution. Whether OP_CAT will overcome these challenges remains to be seen, but it's clear that Bitcoin is growing and diversifying under the guidance of key figures in the industry.