The cryptocurrency market entered full-blown crisis mode in late November 2018, with Bitcoin suffering its worst monthly performance in more than seven years. The world’s largest digital currency traded at approximately $3,820 on November 27, capping a brutal 37% decline for the month of November alone — the steepest monthly drop since April 2011, when Bitcoin fell roughly 39%.
TL;DR
- Bitcoin dropped 37% in November 2018, trading around $3,820 on November 27
- The collapse erased approximately $70 billion from the total cryptocurrency market capitalization
- The Bitcoin Cash hard fork on November 15 triggered a devastating “hash war” between competing factions
- BTC broke below the critical $5,850 support level and failed to recover
- Ether lost 43% in November while XRP declined 18%, though XRP briefly overtook ETH for second place by market cap
The November Bloodbath in Numbers
Bitcoin began November 2018 trading above $6,300, following a relatively calm October where it had traded near $6,400 with remarkably low volatility. The stability that characterized October evaporated almost overnight. By November 25, BTC had crashed through the psychologically important $4,000 barrier, sliding another 4.5% in a single day to hit $3,635. The digital currency was now down more than 70% since the start of 2018 and a staggering 80% from its all-time high near $20,000 reached in December 2017.
The carnage was not limited to Bitcoin. According to CoinMarketCap data from November 27, the total market capitalization of all major cryptocurrencies took a $70 billion hit for the month. Ethereum traded at approximately $110, having fallen 43% in November alone. XRP, which briefly overtook Ethereum as the second-largest cryptocurrency by market cap at around $14.5 billion, declined 18% during the same period. Bitcoin Cash itself was changing hands at roughly $179, while the newly created Bitcoin SV — born from the contentious fork — traded near $92.
The Hash War That Broke the Market
Central to November’s collapse was the Bitcoin Cash hard fork that took place on November 15, 2018. What should have been a routine network upgrade devolved into what the cryptocurrency community dubbed a “hash war” — a bitter, expensive contest between two competing visions for the Bitcoin Cash blockchain.
On one side stood Bitcoin ABC, backed by Roger Ver and Bitmain’s Jihan Wu, advocating for a roadmap that included features like canonical transaction ordering and opcodes that would enable more complex smart contracts. On the other side was Bitcoin SV (Satoshi’s Vision), championed by Craig Wright and Calvin Ayre’s CoinGeek, which pushed for dramatically larger block sizes and a stricter interpretation of Satoshi Nakamoto’s original Bitcoin protocol.
The conflict went far beyond a technical disagreement. Both sides deployed massive amounts of hash power to mine their preferred chain, effectively burning through millions of dollars in an attempt to establish dominance. Miners were incentivized to abandon the Bitcoin network to participate in the hash war, temporarily reducing BTC’s own network security. The result was a protracted battle that sapped confidence across the entire cryptocurrency market.
Michael Moro, CEO of Genesis Global Trading, noted that the fork had created significant uncertainty. “While the split occurred on a different blockchain, there were still spill-over effects on other cryptos, including Bitcoin,” he explained. The Bitcoin Cash network split into two permanently divergent chains — Bitcoin ABC (which retained the BCH ticker on most exchanges) and Bitcoin SV — leaving investors confused and exchanges scrambling to manage the logistics of two competing assets.
Breaking Key Support Levels
From a technical analysis perspective, the damage was severe. Bitcoin had maintained a key support level around $5,850 for months. When that level finally broke, selling accelerated dramatically. Moro observed that “it didn’t take much for the price to break down” once the $5,850 support was lost. A spike in short interest followed, as momentum traders piled onto the bearish side, amplifying the sell-off.
The sell pressure was compounded by forced liquidations and cascading margin calls. With Bitcoin mining becoming increasingly unprofitable at lower price levels, some miners were forced to sell their holdings to cover operational costs, creating a feedback loop of downward price pressure. Genesis Trading reported seeing some buy-side interest around $4,000, but Moro cautioned that it remained unclear whether this represented a genuine bottom or merely a brief consolidation before the next leg down.
Why This Matters
The November 2018 crash, supercharged by the Bitcoin Cash hash war, represented a watershed moment for the cryptocurrency industry. It demonstrated that governance disputes on a single blockchain could have systemic consequences across the entire digital asset ecosystem. The hash war consumed vast amounts of computational resources and capital that could have been directed toward productive development, and it shattered the narrative that the cryptocurrency market had matured beyond its volatile early years.
The events also underscored the fragility of cryptocurrency support levels in the absence of institutional buyers. While October’s stability had suggested a maturing market, November’s rapid descent proved that technical support levels could dissolve with remarkable speed when negative catalysts aligned. The $70 billion wiped from the market in a single month served as a stark reminder of the risks inherent in this still-young asset class.
Disclaimer: This article is for informational purposes only and does not constitute financial advice. Past performance is not indicative of future results. Cryptocurrency investments carry significant risk, and readers should conduct their own research before making investment decisions.