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Cathie Wood’s Ark Invest Leans Into Crypto Dip With Fresh Bitmine And Circle Purchases

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Cathie Wood’s Ark Invest kept buying into the crypto slump, adding to positions tied to digital assets as Bitcoin steadied in the mid $70,000s and sentiment stayed fragile.

Trade disclosures showed the firm’s ETFs bought about $3.25M of Bitmine Immersion Technologies on Tuesday, adding exposure to a stock that has tracked the broader slide in crypto-linked names.

The firm also added roughly $2.4M of Circle Internet Group through its funds, according to the same filings.

In addition, Ark picked up about $3.5M of Bullish, and it bought about $630,606 of Coinbase.

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Ark Steps Up Buying As Bitcoin Slips And Risk Appetite Weakens

The purchases landed in a market still shaped by deleveraging and shaky risk appetite. Bitcoin had slipped below $80,000 earlier in the week, and the pullback kept pressure on crypto-related equities as investors reassessed how much risk they wanted to carry.

Ark’s Tuesday trades followed a heavier round of buying on Monday, when the firm disclosed about $24.8M of added exposure across several crypto-exposed names, with Robinhood and Bitmine among the biggest adds.

That earlier filing included roughly 235,077 shares of Robinhood valued at about $21.1M, alongside 274,358 shares of Bitmine worth roughly $6.2M, based on the disclosed figures.

Long-Term Crypto Thesis Drives Ark’s Buy-The-Dip Strategy

The buying fits Ark’s long-running view that steep drawdowns can create entry points in public markets linked to crypto infrastructure, trading and stablecoins, especially when liquidity thins and volatility shakes out fast money.

In its Big Ideas 2026 report, Ark laid out the upside it still sees in the sector. The firm said the market “could grow at an annual rate of ~61% to $28 trillion in 2030”.

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The firm also expects Bitcoin to dominate that mix. “We believe Bitcoin could account for 70% of the market,” it said, with the remainder led by smart contract networks such as Ethereum and Solana.

The post Cathie Wood’s Ark Invest Leans Into Crypto Dip With Fresh Bitmine And Circle Purchases appeared first on Cryptonews.

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Crypto World

Bitcoin’s Quantum Migration May Reveal Number of Satoshi Coins: Adam Back

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Bitcoin's Quantum Migration May Reveal Number of Satoshi Coins: Adam Back

Blockstream CEO Adam Back said Thursday that a future post-quantum migration of Bitcoin could help clarify how many coins linked to Satoshi Nakamoto remain accessible, because any owner wanting to protect vulnerable holdings would need to move them to a new address format.

Speaking at Paris Blockchain Week, Back said such a migration would likely give users ample time to move funds and argued that coins left unmoved after that process could reasonably be treated as lost.

“This migration to post-quantum address format may tell us how many of those coins [Satoshi] still has,” said Back, adding that the pseudonymous creator has an estimated 500,000 to 1 million Bitcoin (BTC).

Satoshi’s Bitcoin stash has ignited heated debate among Bitcoin holders concerned by the quantum computing threat. On Wednesday, Jameson Lopp and five co-authors published a Bitcoin Improvement Proposal aimed at restricting the future movement of coins held in quantum-vulnerable address formats, including older coins whose public keys have already been exposed.

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Adam Back, keynote speech at Paris Blockchain Week in 2026. Source: Cointelegraph

Blockchain data platform Arkham estimates that Nakamoto-linked wallets hold 1.09 million Bitcoin, currently valued at $81.6 billion.

Related: Bernstein says Bitcoin market already priced in quantum risk

Back sees long runway on quantum

Back said Bitcoin developers and holders still have substantial time to prepare, arguing that a quantum breakthrough capable of threatening Bitcoin signatures is at least 20 years away.

He argued that today’s quantum computers are “less powerful than a $5 calculator” and that some of their issues become more pressing as these systems scale, such as their energy consumption.

Back said that runway should give developers and users ample time to develop a post-quantum path and migrate to a new quantum-resistant standard underpinned by hash-based signatures.

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Hash-based signature schemes for Bitcoin, research paper. Source: Blockstream Research

In December 2025, Back’s Blockstream Research released a paper proposing a hash-based signature scheme that offers a “promising path for securing Bitcoin in a post-quantum world,” as a quantum-safe replacement for the ECDSA and Schnorr signatures. Under the proposal, security would rely solely on hash function assumptions, similar to the ones currently used in Bitcoin’s network design.

The Elliptic Curve Digital Signature Algorithm (ECDSA) uses elliptic-curve cryptography to verify the authenticity and integrity of a message. Schnorr signatures are another signature scheme praised for enhancing privacy and reducing data size, due to their ability to combine multiple signatures into one.

Magazine: Bitcoin vs. the quantum computer threat — Timeline and solutions (2025–2035)