Battle for Bitcoin's soul opens as first block supporting 'clean-up' proposal is mined

Bitcoin’s latest governance clash escalated this week as the first block signaling support for a temporary soft fork designed to restrict arbitrary, non-monetary data in the blockchain's transactions was produced by mining pool Ocean.

The proposal, formally assigned BIP-110 after evolving from earlier drafts, aims to reinstate strict limits on transaction output sizes and arbitrary data fields for about a year. The idea is to curb what proponents see as “spam” uses of block space for non-financial data. They argue that unchecked data, including large inscriptions and so-called OP_RETURN payloads, threaten the original blockchain's role as sound monetary infrastructure and burden node operators.

The community remains deeply divided. Prominent critics, including Blockstream CEO Adam Back, have warned that consensus-level intervention could harm Bitcoin’s credibility and lead to preferential treatment of some transactions in violation of the principle of neutral transaction capacity. He also questioned the level of support for the proposal, which, he said, increased the risk of the blockchain being split.

Adding fuel to the debate, a developer recently inscribed a 66 KB image in a single transaction on Bitcoin, an apparent pushback against BIP-110’s core claims and a demonstration of how large amounts of data can be encoded even without relying on OP_RETURN.

OP_RETURN and similar approaches are script instructions used to mark a transaction output as invalid for spending, effectively allowing users to repurpose that space to permanently embed arbitrary data — like text or images — directly into the blockchain

As the controversy unfolds, it underscores enduring philosophical tensions within Bitcoin. Should network aggressively defend a narrowly defined monetary purpose or maintain maximal neutrality toward arbitrary uses of its base layer?