On March 23, 2026, Bitcoin’s blockchain experienced a rare two-block reorganization (reorg). Foundry, the largest mining pool at the time, mined several blocks in quick succession, overtaking a competing chain that included valid blocks from Antpool and ViaBTC. These pools, alongside others like F2Pool, Binance Pool, Luxor, and Braiins, control a significant share of Bitcoin’s hash rate, making such events more likely.
Foundry didn’t "force" the outcome—it simply had enough hash power, combined with mining's random nature, which typically means larger pools get lucky more often.
Why Foundry Mined Multiple Blocks in a Row: Probability, Not Turn
Mining is random. Even smaller players can get lucky, but larger pools statistically hit valid blocks more often.
High Hash Power Concentration: Foundry’s dominance in hash power allows it to submit an enormous number of hash attempts, statistically improving its chances of mining consecutive blocks.
Bottom Line, Foundry mined several blocks in a row due to:
- Large hash power (dominance)
- Random probability (luck)
- Network timing (latency)
- Chain momentum once ahead
While nothing was broken, this event highlights how scale, probability, and timing can temporarily give one pool control over the chain.
At first glance, this might seem alarming, but it wasn’t a hack or network failure. It was simply Bitcoin’s proof-of-work consensus at work, where the chain with the most accumulated work wins. Foundry’s chain became the dominant one, orphaning Antpool’s and ViaBTC’s blocks, but their transactions weren’t lost; they were added back to the mempool and included in later blocks.
The Real Story Behind the Split
This event highlights a troubling trend in Bitcoin mining: centralization. The mining difficulty recently dropped by nearly 8%, pushing smaller miners out and consolidating hash rate among large pools. Events like the March 23 reorg are becoming more likely due to this centralization.
Here’s how it unfolded: Foundry and Antpool found blocks just 12 seconds apart. Later, ViaBTC mined a block, leading to competing chains. Foundry’s chain mined faster and eventually became the "winning" chain, orphaning Antpool’s and ViaBTC’s blocks.
What Does This Tell Us About Bitcoin’s Future?
This event is a symptom of a bigger issue: the increasing concentration of mining power in a few large pools, weakening Bitcoin’s decentralization. While Bitcoin’s consensus mechanism allowed the network to recover, these moments highlight a potential fragility in the system. If a few pools dominate, the likelihood of frequent reorgs and potential manipulation increases, threatening the network’s core principles.
Historically, Bitcoin has had reorgs (e.g., in 2013, 2020, and 2021), but as mining power centralizes, such events may become more frequent and noticeable.
The Bigger Picture: Mining Centralization’s Impact on Bitcoin
Although this reorg didn’t result in loss or disruption, it underscores a growing issue: the power of large mining pools. With smaller miners being squeezed out, the largest pools now control an even greater portion of Bitcoin’s hash rate, making it more likely for events like this to occur.
This growing centralization threatens Bitcoin’s decentralization, one of its most defining features. While a single reorg might not seem like a major threat, it signals the network’s design being tested by centralization.
Why Should We Care?
A Bitcoin network dominated by a few large pools introduces risks to its security and ethos. The more centralized the network becomes, the more vulnerable it is to attacks, manipulation, or censorship. The economic forces pushing Bitcoin toward centralization could undermine the very decentralization that it was built to protect.
The March 23 event is a reminder that Bitcoin’s future depends on maintaining a robust, decentralized mining ecosystem. If the trend of mining centralization continues, the consequences could be far-reaching: more frequent reorgs, a less secure network, and an erosion of trust in Bitcoin as a decentralized financial system.
Conclusion: A Wake-Up Call for Bitcoin’s Community
Bitcoin didn’t break on March 23—the blockchain remains intact. However, the issue of mining centralization has become a wake-up call. Temporary splits and reorgs are normal, but as mining power becomes more concentrated in a few large pools, these events could become more frequent, threatening Bitcoin’s foundational principles.
To maintain Bitcoin as the decentralized digital asset it promises to be, the community must work to ensure that mining power is more evenly distributed. Otherwise, Bitcoin could face challenges that undermine its very foundation.