Bitcoin Drops Below $67,000 as Ethereum Foundation Unveils Quantum Defense Roadmap

Bitcoin ended the week below $67,000 after surrendering early gains triggered by geopolitical developments in the Middle East. Meanwhile, the Ethereum Foundation published a comprehensive roadmap for protecting the network against quantum computers, and CoinShares data revealed that 20% of Bitcoin miners have capitulated.

A Volatile Week: BTC Swings From $72,000 to $65,000

The week opened on an optimistic note as Bitcoin climbed above $70,000 on Monday following President Donald Trump's announcement of a pause on strikes against Iran. Momentum carried prices to $72,000 by Wednesday.

BTC/USDT hourly chart on Binance. Source: TradingView

That level proved to be the local top. On Thursday, March 26, selling pressure pushed BTC from $72,000 to $68,000 within 24 hours. Friday brought further pain as the price plunged to $65,000, driven by reports of escalating Middle East tensions and outflows from exchange-traded funds.

Spot Bitcoin ETFs snapped a four-week inflow streak, losing $296 million between March 23 and 27. Ethereum ETFs shed an additional $206 million over the same period.

Spot Bitcoin ETF outflows. Source: SoSoValue

Over the weekend, BTC stabilized just under $67,000 — a 3% weekly decline. Altcoins followed the flagship lower with sharper drawdowns: Ethereum fell 4%, XRP dropped 5%, and Solana slid 5.8%. HYPE bucked the trend with a 2% gain, holding its position as the 10th-largest cryptocurrency by market cap.

Total crypto market capitalization stands at $2.37 trillion with BTC dominance at 56.1% and ETH at 10.1%. The Crypto Fear & Greed Index sits at 9 — deep in "extreme fear" territory.

Crypto Fear & Greed Index. Source: Alternative

Why This Matters

This week underscored the crypto market's deep sensitivity to macroeconomic and geopolitical forces. Combined outflows from Bitcoin and Ethereum ETFs exceeding $500 million in just five days point to growing institutional caution. A Fear & Greed reading of 9 represents one of the lowest levels on record, reflecting severe pessimism among market participants at a time when miner economics are also under extreme pressure.

Miner Activity Drops to Historic Lows

The Miner Position Index (MPI) fell to -1.04, its third-lowest reading ever. CryptoQuant analyst Ignacio Moreno de Vicente characterized the level as a bullish signal: miners are sending significantly fewer coins to exchanges compared to the annual average, meaning structural sell pressure from this cohort has eased.

Miner Position Index at a historic low. Source: X

De Vicente cautioned that a low MPI alone does not guarantee upside. Without clear demand expansion — through spot flows, ETF inflows, or derivatives positioning — a sustained rally is unlikely. The signal strengthens when the index begins rising from its lows, indicating a return of activity as market conditions improve.

CoinShares reported that Q4 2025 was the toughest quarter for Bitcoin miners since the last halving, with 20% of operators capitulating. The weighted average cost of production among public miners reached $79,995 per coin. Miners running mid-generation hardware are operating below breakeven at current hash prices, especially those paying $0.05 per kWh or more for electricity.

CoinShares head of research James Butterfill noted that a prolonged price slump would force unprofitable miners offline, slowing hashrate growth and ultimately rebalancing profitability. In a notable development, MARA Holdings sold 15,133 BTC worth approximately $1.1 billion during the week to fund a buyback of its own bonds.

Ethereum Foundation Outlines Four Hard Forks for Quantum Resistance

The Ethereum Foundation released a roadmap detailing four sequential hard forks designed to shield the network from quantum computing threats:

• Fork I — provides validators with a public key that can be activated if a quantum computer suddenly emerges;
• Fork J — reduces gas costs for verifying quantum-safe signatures;
• Fork L — introduces state compression using zero-knowledge proofs to efficiently package blockchain state and signature data;
• Fork M — extends quantum protections to Layer 2 networks.

Ethereum quantum defense roadmap. Source: Ethereum Foundation

The upgrades will span all three protocol layers — execution, storage, and data availability. The foundation estimates that "cryptographically relevant" quantum devices are 8 to 12 years away but stresses that preparation must begin now. The network overhaul is targeted for completion by 2029, though full migration will extend beyond that timeline.

OpenAI Shuts Down Sora, Telegram Repays $1.75B in Bonds

OpenAI announced the closure of its AI video generation app Sora without providing a detailed explanation. Despite initial excitement around the Sora 2 model and an accompanying social network, the product failed to retain users. Downloads peaked at approximately 3.3 million in November 2025 across App Store and Google Play, then declined to 1.1 million by February. The Sora 2 model remains accessible on a paid basis through ChatGPT. OpenAI also discontinued its Instant Checkout feature and is now planning to transform ChatGPT into a "super app."

Telegram founder Pavel Durov announced the full repayment of convertible bonds issued five years ago. The company had placed $1 billion in five-year bonds at 7% annual interest in March 2021, followed by an additional $750 million tranche in May. Durov stated that Telegram's monetization strategy allowed the messenger to become profitable in 2024, and that a more recent bond issuance was oversubscribed.