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OP_CAT: an ancient code may change Bitcoin

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by Giorgi Kostiuk

8 months ago


  1. Overview of OP_CAT
  2. Security and potential implications
  3. Community divides

  4. Bitcoin relies on a set of codes developed over ten years ago by its mysterious creator, Satoshi Nakamoto. Today, an old line of code, long forgotten, could transform the cutting-edge blockchain. This potential resurrection is sparking heated debates within the community, with everyone pondering the possible impacts of such an update.

    Overview of OP_CAT

    The OP_CAT opcode, also known as BIP-420, is a feature that, if re-integrated into Bitcoin, could deeply change how the blockchain operates. This line of code is not new. In fact, it was part of the original Bitcoin protocol, but was removed by Satoshi in 2010 due to security concerns. Today, with more robust security systems, some developers believe the time has come to reintroduce this feature.

    Security and potential implications

    One of the reasons OP_CAT divides the community so much is related to the issue of security. Those opposed to its reintroduction fear it could create vulnerabilities or perverse incentives for miners, like the infamous Maximum Extractable Value (MEV). MEV refers to the gains miners can make by reordering transactions within a block, a practice that could disrupt Bitcoin’s current balance and lead to transaction censorship. Others, like Bodily from Bioniq, believe these fears are overstated. According to him, OP_CAT would actually offer increased flexibility to migrate complex transactions off the main chain to layer 2 solutions, which are less costly and faster.

    Community divides

    Despite these reservations, OP_CAT continues to garner interest. Some believe this feature could offer opportunities far beyond simple covenants, becoming a versatile tool for those developing on Bitcoin. Paul Sztorc, creator of the BIP 300 “Drivechains” proposal, admits that while reintegrating OP_CAT seems safe, he would like to see concrete tests to evaluate its real benefits before adopting it definitively.

    A line of code created over ten years ago is once again at the center of the Bitcoin community's attention. OP_CAT could either be a relic of the past or the key to future innovations for the Bitcoin blockchain. Developers and users are in the process of debating its potential impact and benefits.

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