Critics Say BIP-110 Could Break Self-Custody and Risk User Funds

BIP-110 has emerged as a contentious proposal within the Bitcoin network, drawing sharp criticism from prominent figures including Blockstream CEO Adam Back, who warns the improvement proposal could trigger a minority fork and fail to achieve activation. The controversy centers on BIP-110's intended function: restricting non-monetary data transmission in Bitcoin transactions through a user-activated soft fork designed to address what proponents describe as a "squatter problem" or spam issue on the blockchain.

The technical and consensus barriers facing BIP-110 appear formidable. As of late June 2026, the proposal commands less than 5% node support among Bitcoin network participants and has achieved zero backing from miners—the entities whose computational power ultimately determines which rules the network enforces. Adam Back explicitly warned that given these support levels, BIP-110 will either self-fork or fail to activate by its August 7, 2026 deadline, making successful implementation increasingly unlikely.

Beyond consensus challenges, critics raise substantial concerns about wallet compatibility and user asset security. According to available reports, BIP-110 implementation could break wallet functionality across multiple platforms, including the Bitcoin Knots client—outcomes that could result in direct fund loss for users. The proposal risks fragmenting the ecosystem such that user assets become stranded across incompatible systems, effectively locking funds. This represents a fundamental break with self-custody principles that form the foundation of Bitcoin's value proposition.

Critic Matt Corallo and others argue that BIP-110 is "fundamentally antithetical to everything Bitcoin stands for," raising deeper philosophical and technical objections. Some observers have contended that the aggressive implementation method and potential for coin disabling or confiscation-like functionality represent a departure from Bitcoin's core immutability and censorship-resistance properties. Bitcoin Core developers have reportedly shown no desire to address the underlying non-monetary data issue through alternative approaches, contributing to the polarization surrounding this proposal.

The broader implication is that BIP-110 faces a credibility crisis: even if proponents believe the anti-spam mechanism has merit, the combination of minimal network support, implementation risks to wallet infrastructure, and philosophical objections to the governance mechanism itself suggest the proposal is unlikely to achieve the consensus necessary for successful activation before its deadline.