Bitcoin BIP 110 Fork Deadline Nears with Minimal Miner Support

Bitcoin Improvement Proposal 110 (BIP 110), which seeks to temporarily restrict the use of "arbitrary data" on the Bitcoin network, is entering a critical phase with minimal support from miners. This proposal, also known as the "Reduced Data Temporary Softfork" (RDTS), aims to alleviate network congestion caused by data-intensive applications such as Ordinals inscriptions, BRC-20 tokens, and Runes. Despite a mandatory signaling window set to begin in early August 2026, miner support for BIP 110 currently remains below 1%.

BIP 110 proposes to introduce seven new consensus rules that would cap the size of arbitrary non-financial data embedded in Bitcoin transactions for approximately one year. These technical specifications include limiting the OP_RETURN field to 83 bytes and data pushes to 256 bytes. The activation mechanism for BIP 110 is a User-Activated Soft Fork (UASF). For early lock-in, 55% of miners (1,109 out of 2,016 blocks) within a single difficulty period must signal their support. If this threshold is not met, a mandatory signaling window will commence around block 961,632 (projected for August 7, 2026), during which nodes enforcing BIP 110 will reject blocks that do not signal bit 4. Activation is then anticipated around September 1, 2026, at block 965,664.

Leading figures in the cryptocurrency industry, including MicroStrategy Executive Chairman Michael Saylor and Blockstream CEO Adam Back, have voiced strong opposition to the proposal. Saylor stated on social media that “there are 110 things more dangerous to Bitcoin than spam,” arguing that escalating a spam dispute into a consensus change that could invalidate valid, fee-paying transactions sets a perilous precedent. Adam Back contended that BIP 110 conflicts with Bitcoin's core principles of decentralization and permissionlessness by attempting to impose behavioral constraints through consensus-layer mechanisms, warning of a potential chain split.

Proponents of BIP 110 argue that Ordinals and similar data-heavy activities increase network congestion, impose operational burdens on node operators, and divert development focus away from Bitcoin's primary purpose as sound money. They believe that restricting arbitrary data storage will ensure Bitcoin remains a payment-focused system, reducing reliance on third-party payment processors and mitigating censorship risks. Developer Luke Dashjr, a key supporter of the proposal, has rejected calls to withdraw it, stating, “it's too late to cancel BIP 110.”

This debate echoes the "Blocksize Wars" that gripped the Bitcoin community between 2015 and 2017, where similar ideological divisions arose over block capacity and the network's future role. BIP 110 highlights a fundamental philosophical divergence within the Bitcoin community regarding whether it should solely function as a value transfer mechanism or also accommodate broader data storage functionalities. The current relatively low level of Ordinals activity makes the timing of this contentious debate particularly noteworthy.

The fate of BIP 110 in the coming period hinges on the stance of node operators during the mandatory signaling window in August. Should a sufficient number of nodes run BIP 110-compatible software and begin rejecting non-signaling blocks, it could lead to a chain split. This scenario could introduce uncertainty and double-spend risks within the Bitcoin ecosystem, potentially negatively impacting markets. Analysts and market observers suggest that Bitcoin's decentralized governance structure sets a high bar for such significant protocol changes, resisting rushed or narrow decisions, which is seen as crucial for maintaining network credibility.