Layla Zulfa
The long-simmering ideological and technical conflict within the Bitcoin community reached a definitive breaking point over the weekend, resulting in a chain split that appears to have failed almost immediately upon inception. The breakaway faction, supporting a controversial Bitcoin Improvement Proposal known as BIP-110, initiated a hard fork on Saturday at block 961,632. However, the minority chain struggled to maintain momentum, mining only two blocks in an eight-hour window before essentially grinding to a halt. This technical stall highlights the immense difficulty of launching a minority fork without significant hash power or built-in difficulty adjustment mechanisms.
The split occurred when nodes running BIP-110 software began enforcing a new set of consensus rules, specifically rejecting any blocks that did not signal support for the proposal. The catalyst for the divergence was a block mined by AntPool, one of the world’s largest mining operations, which did not include the necessary signal for BIP-110. While the main Bitcoin network accepted the AntPool block and continued its normal operations, nodes following the BIP-110 protocol rejected it, seeking an alternative path. A miner participating in the Ocean mining pool eventually produced a block that satisfied the BIP-110 requirements, creating the splinter chain. Within hours, however, the disparity between the two networks became insurmountable, with the main Bitcoin network outpacing the fork by dozens of blocks.
The Technical Mechanics of a Stalled Fork
The primary reason for the BIP-110 chain’s rapid failure lies in the fundamental architecture of Bitcoin’s difficulty adjustment algorithm. Bitcoin is designed to produce one block approximately every ten minutes. To maintain this consistency, the network recalibrates its mining difficulty every 2,016 blocks—roughly every two weeks—based on the total computing power (hash power) dedicated to the network.
When the BIP-110 chain split from the main network, it inherited the difficulty setting of the entire Bitcoin network. However, it only commanded a tiny fraction of the total hash power. Data indicates that only approximately 2.53% of recent blocks had signaled support for the proposal prior to the split, a figure far below the 55% threshold generally considered necessary for a smooth transition or a successful "soft fork" activation.
With only 2.53% of the hash power attempting to solve mathematical puzzles set for 100% of the network’s power, the time required to mine a single block increased exponentially. At this current pace, the minority chain would require approximately 350 days to reach its next difficulty adjustment. In contrast, the main Bitcoin network continues to produce blocks every ten minutes. This creates a "death spiral" scenario for the minority chain: without frequent blocks, the network is unusable for transactions, and without a functional network, miners have little incentive to dedicate expensive electricity to a chain that may never reach its next recalibration.
Historical Context: The Rise of Ordinals and the BIP-110 Proposal
The roots of the BIP-110 conflict trace back to the emergence of the Ordinals protocol in late 2022. Ordinals allowed users to "inscribe" data—such as images, text, and even video—directly onto the Bitcoin blockchain by utilizing the witness data space expanded by the Segregated Witness (SegWit) and Taproot upgrades. This led to an explosion of "Bitcoin NFTs" and BRC-20 tokens, which significantly increased the demand for block space.
Backers of BIP-110, which proposed a soft fork to temporarily bar or limit the inclusion of non-financial data in Bitcoin transactions, argued that these inscriptions constituted "spam." They contended that the practice clogs the network, leads to bloated blockchain size (making it harder for individuals to run full nodes), and drives up transaction fees for users who simply wish to send monetary payments. For the proponents, BIP-110 was a necessary defensive measure to preserve Bitcoin’s primary function as a peer-to-peer electronic cash system and a store of value.
Conversely, a majority of the Bitcoin community, including prominent developers and large-scale miners, viewed BIP-110 as a move toward censorship. The prevailing counter-argument is that Bitcoin is an open, permissionless protocol. If a user pays the prevailing market rate for block space, they should be entitled to use that space for any data they choose, provided it follows the technical rules of the network. Opponents argued that allowing a subset of the community to decide which transactions are "legitimate" based on content would destroy Bitcoin’s core value proposition of being censorship-resistant.
A Chronology of the Split: Block 961,632 and Beyond
The timeline of the fork reveals a swift and decisive rejection by the broader market and mining ecosystem:
- Pre-Fork Signaling: In the weeks leading up to block 961,632, BIP-110 supporters attempted to rally hash power. Despite vocal advocacy on social media, signaling remained stagnant at roughly 2.5%.
- The Trigger Point: On Saturday, the Bitcoin network reached block 961,632. At this height, the BIP-110 software was programmed to begin "enforcing" the new rules.
- The Divergence: AntPool mined a standard Bitcoin block. Mainnet nodes accepted it. BIP-110 nodes, seeing no "support signal" in the block header, rejected it and waited for a compliant block.
- The Minority Block: A miner on the Ocean pool, which has been vocal about filtering "spam" in the past, successfully mined a BIP-110 compliant block. This officially created the "BIP-110 chain."
- The Stall: After the second block was mined on the minority chain, the sheer lack of hash power became evident. The time between blocks stretched into hours.
- Sunday Morning Realities: By Sunday, the main Bitcoin network had progressed nearly 100 blocks ahead of the BIP-110 chain. Michael Saylor and other industry leaders noted the "decisive" failure of the breakaway attempt.
Market Sentiment and Industry Reactions
The reaction from prominent figures in the Bitcoin space was swift and largely critical of the BIP-110 faction. Michael Saylor, the Executive Chairman of MicroStrategy and one of Bitcoin’s most influential advocates, took to X (formerly Twitter) to emphasize the resilience of the original network.
"Bitcoin worked exactly as designed," Saylor posted. "BIP-110 was free to fork, and the network was free not to follow. The result was decisive: about 99.85% of Bitcoin’s hash power stayed with Bitcoin. The BIP-110 branch mined only two blocks and is already more than 80 blocks behind."
Saylor’s comments reflect a broader consensus that Bitcoin’s governance is dictated by the "proof of work" and the voluntary agreement of node operators. He had previously warned that BIP-110 set a dangerous precedent by attempting to turn a subjective dispute over "spam" into a mandatory change in the consensus layer.
Jameson Lopp, co-founder of the Bitcoin security firm Casa and a long-time advocate for network decentralization, expressed even stronger disapproval. Lopp criticized the proponents of the fork for what he characterized as a campaign of misinformation and harassment.
"I won’t be ‘welcoming back’ or unblocking any BIP-110 supporters," Lopp stated. "They proved themselves to be susceptible to delusional propaganda from folks emanating reality distortion fields. In many cases they spewed vitriol and harassed the very people who have devoted their lives to supporting and improving Bitcoin."
Lopp’s sentiment suggests that the split has caused a significant social rift within the developer community, one that may take years to heal, even if the technical threat of the fork has dissipated.
Security Risks: The Threat of Replay Attacks
Beyond the technical failure of the fork, there remains a significant danger for any users who attempted to interact with the BIP-110 chain. Because the fork did not implement "strong replay protection," transactions on one chain look identical to transactions on the other.
This creates a "replay attack" vulnerability. If a user attempts to sell or move their "BIP-110 coins" on the minority chain, a malicious actor or an automated system could take that same transaction data and "replay" it on the main Bitcoin network. This would result in the user unintentionally moving or losing their real BTC. For this reason, security experts have warned holders to avoid moving any funds until the minority chain is officially declared dead or until specialized tools are developed to split the coins safely.
Furthermore, the mandatory signaling window for BIP-110 is set to close at block 963,647. Given the current rate of block production on the minority chain, it is mathematically impossible for the fork to reach that milestone in a timeframe that would retain any relevance.
Governance and the Future of Bitcoin Development
The failure of BIP-110 serves as a potent case study in the governance of decentralized protocols. It demonstrates that without overwhelming consensus among miners, developers, and economic users (exchanges and holders), any attempt to change Bitcoin’s core rules is likely to result in a failed splinter rather than a network-wide upgrade.
The event also highlights the effectiveness of Bitcoin’s "Difficulty Adjustment" as a defense mechanism against hostile or minority forks. By requiring a chain to prove its viability through hash power, the protocol ensures that only the most supported versions of the network survive.
While the BIP-110 chain appears to be a "ghost town," the debate over Ordinals and block space utilization is unlikely to vanish. The high fees associated with inscriptions continue to be a point of contention for those who believe Bitcoin should remain focused on small-value transactions. However, the resolution of the BIP-110 saga suggests that the community prefers to address these issues through Layer 2 solutions—such as the Lightning Network—rather than through restrictive changes to the base layer that could compromise Bitcoin’s status as a neutral, censorship-resistant platform.
As of Sunday afternoon, the main Bitcoin network continues to operate without interruption, maintaining its 10-minute block interval and total security. The BIP-110 experiment, while disruptive in discourse, has ultimately proven the strength of the existing Bitcoin consensus model.
