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The Bitcoin network reached a critical technical juncture at block 961,632 on Saturday as Bitcoin Improvement Proposal 110 (BIP-110) officially entered its mandatory-signaling phase. According to real-time data from the BIP-110 monitor, the transition occurred amidst a significant lack of consensus among the network’s mining community. In the 2,016 blocks preceding the activation threshold, miners signaled support for the proposal in only 51 blocks, representing a participation rate of approximately 2.53%. This figure falls drastically short of the 55% threshold typically required for early, stable activation of consensus changes, signaling a deep divide within the ecosystem regarding the future of Bitcoin’s data handling.
Upon the arrival of block 961,632, nodes configured to enforce BIP-110 began the process of rejecting any newly mined blocks that did not have "version bit 4" set in their header. This technical requirement is the mechanism through which miners indicate their readiness and support for the upgrade. While these enforcing nodes began filtering the blockchain, the vast majority of the Bitcoin network—comprised of ordinary nodes and miners not running the BIP-110 software—continued to accept both signaling and non-signaling blocks. This divergence resulted in the immediate emergence of a minority BIP-110 branch. However, due to the overwhelming concentration of hash power on the legacy chain, this minority branch quickly fell behind the dominant blockchain in terms of cumulative proof-of-work.
Technical Architecture and the Scope of BIP-110
BIP-110, authored by the pseudonymous developer Dathon Ohm, is designed as a temporary consensus-level intervention intended to last approximately one year. The proposal seeks to address what some developers describe as "data bloat" on the Bitcoin blockchain, primarily driven by the rise of Inscriptions, BRC-20 tokens, and other non-monetary data storage use cases.
The proposal introduces several specific restrictions on transaction outputs and witness data. Under BIP-110, most new output scripts would be capped at 34 bytes, while OP_RETURN outputs—a common method for embedding arbitrary data into the blockchain—would be restricted to a maximum of 83 bytes. Furthermore, the proposal seeks to limit certain data pushes and witness elements to 256 bytes and imposes temporary restrictions on several features introduced by the 2021 Taproot upgrade. To maintain backward compatibility and avoid the loss of funds, unspent transaction outputs (UTXOs) created before the activation date are exempt from these new rules.
Proponents of the measure argue that these restrictions are necessary to preserve the long-term decentralization of the network. They contend that the proliferation of non-monetary data increases the hardware requirements for running a full node by inflating storage needs and bandwidth consumption. By making it more expensive or technically difficult to "inscribe" data on-chain, supporters believe the network can refocus on its primary role as a peer-to-peer electronic cash system.
The Signaling Window and Activation Timeline
The deployment of BIP-110 follows a specific chronological roadmap defined by its version bit signaling. The current window, spanning from block 961,632 to block 963,647, serves as the mandatory-signaling period. During this time, any node running the BIP-110 enforcement code will automatically "orphan" (reject) any block that does not signal support via bit 4.
The technical specification outlines the following milestones:
- Block 961,632: Commencement of mandatory signaling.
- Block 963,648: The point at which the proposal is intended to enter a "locked-in" state, provided the signaling requirements are met.
- Block 965,664: The scheduled activation point where transaction-level restrictions begin to be enforced by the network.
However, the current signaling rate of 2.53% suggests that the proposal is unlikely to achieve widespread adoption through traditional miner signaling. In the absence of a significant shift in miner behavior, the BIP-110 branch will likely remain a "zombie chain"—a minority fork with so little hash power that it produces blocks far slower than the standard ten-minute interval. Without a difficulty adjustment or a massive influx of hash power, such a chain could effectively stall, making it unusable for standard transactions.
Opposition from Industry Leaders and Miners
The proposal has met with stiff resistance from some of the most influential figures and organizations in the Bitcoin space. Michael Saylor, Executive Chairman of MicroStrategy, and Adam Back, CEO of Blockstream, have both publicly rebuffed the proposal. Critics argue that BIP-110 represents a form of "censorship" that interferes with the free market of Bitcoin’s block space.
The primary argument against BIP-110 is that Bitcoin’s protocol should remain neutral regarding the content of transactions. If a user is willing to pay the prevailing market fee to include data in a block, critics argue the network should facilitate that transaction regardless of whether the data is a financial transfer or an image file. Furthermore, there are concerns that attempting to force a consensus change without overwhelming support could lead to a permanent "chain split," similar to the Bitcoin/Bitcoin Cash split of 2017, which would dilute the network effect and create confusion among users and investors.
Adam Back has specifically noted that attempting to "filter" transactions at the consensus level could lead to unintended consequences, such as miners losing out on fee revenue, which is essential for the long-term security of the network as block rewards continue to halve.
The Proof-of-Work Change Contingency
As the divide over BIP-110 deepens, some proponents have discussed more radical measures to bypass miner opposition. On August 1, Bitcoin developer Chris Guida rebased preliminary code that would facilitate a change in Bitcoin’s proof-of-work (PoW) algorithm. This code was originally conceptualized by Luke Dashjr, the maintainer of Bitcoin Knots and a vocal advocate for reducing blockchain "spam."
A PoW change is often referred to as the "nuclear option" in Bitcoin governance. If implemented, it would render existing SHA-256 mining hardware (ASICs) obsolete on the new chain, effectively firing the current mining industry and allowing the network to start fresh with a different hashing algorithm (such as one optimized for CPUs or GPUs). Guida described this code as a contingency plan to be used only if miners actively "attack" or block the desires of the node-operating community. While no activation date has been set for such a change, its existence highlights the intensity of the current dispute.
Historical Context: Comparing BIP-110 to the 2017 UASF
The current situation draws inevitable comparisons to the "Block Size Wars" of 2017 and the User Activated Soft Fork (UASF) known as BIP-148. In that instance, a segment of the Bitcoin community threatened to run nodes that would reject non-SegWit-signaling blocks, forcing miners to adopt the SegWit upgrade or face a chain split.
The 2017 UASF was ultimately successful in forcing miner adoption because it had significant support from exchanges, wallet providers, and a substantial portion of the economic community. In contrast, BIP-110 currently lacks that broad economic backing. Without the support of major liquidity providers (exchanges) and large-scale payment processors, a minority chain created by BIP-110 would struggle to maintain any market value, making it economically unviable for miners to switch their hash power to it.
Analysis of Implications for the Bitcoin Ecosystem
The low signaling rate for BIP-110 carries several implications for the short-term stability and long-term governance of Bitcoin:
1. Network Fragmentation Risk: While the minority chain is currently lagging, the persistent existence of a fork—even a weak one—creates a "split-brain" scenario for nodes. Users who accidentally run BIP-110 enforcing software might find themselves on a chain where their transactions are not being processed by the rest of the world.
2. The Debate Over "Spam": The BIP-110 movement has forced a rigorous debate over what constitutes "legitimate" use of the Bitcoin blockchain. As fee markets evolve, the community must decide if the protocol should remain a "dumb pipe" for data or if it should be curated to serve specific financial functions.
3. Miner-Node Power Dynamics: The outcome of the BIP-110 signaling window will serve as a barometer for the current balance of power between those who provide the hash power (miners) and those who define the rules (node operators and developers). If BIP-110 fails to gain traction, it may signal that contentious consensus changes are becoming increasingly difficult to implement in a maturing, multi-trillion-dollar asset class.
4. Storage and Bandwidth Concerns: Regardless of the proposal’s success, the underlying issue of blockchain growth remains. If Inscriptions continue to grow at their current pace, the cost of operating a full node will continue to rise, potentially leading to greater centralization as only specialized data centers can afford to maintain the full history of the ledger.
As the mandatory-signaling window progresses toward block 963,647, the industry will be watching closely to see if the BIP-110 proponents can rally further support or if the proposal will fade into the history of Bitcoin’s many unsuccessful fork attempts. For now, the dominant Bitcoin blockchain remains unaffected, continuing to process blocks according to existing consensus rules while the minority branch remains a marginal technical experiment.
