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Bitcoin's growing hashrate is making 51 percent attacks increasingly costly and impractical, according to analysis from financial services firm Schwab, strengthening the network's security as it continues to expand. The firm's director of digital asset research and strategy, Jim Ferraioli, wrote that an attacker attempting a 51 percent attack — gaining control of more than half the network's mining power to manipulate transactions — would need billions of dollars in specialized mining equipment, access to enormous amounts of electricity, and years to build the required infrastructure. By the time an attacker could assemble the necessary resources, the Bitcoin network would likely have grown even larger, making the attack even more difficult to execute. This creates a self-reinforcing security dynamic that Schwab argues supports bitcoin's long-term value proposition.
Understanding 51 Percent Attacks
A 51 percent attack occurs when a single entity or coalition controls more than half of a blockchain's mining hashrate. With majority control, an attacker can prevent new transactions from being confirmed, reverse transactions to enable double-spending, and potentially undermine the integrity of the blockchain. For smaller cryptocurrencies, 51 percent attacks have been a real and recurring threat. Networks with low hashrate are vulnerable because an attacker can rent or purchase enough computing power to temporarily seize control. Bitcoin, however, has by far the largest hashrate of any blockchain, making such attacks prohibitively expensive.
The Self-Reinforcing Security Loop
"As the Bitcoin network continues to grow, its security potentially becomes self-reinforcing," Ferraioli wrote. This insight captures a key aspect of Bitcoin's security model: as more miners participate and the network grows, the cost of attacking it increases, which in turn makes the network more secure and more attractive to users and miners, driving further growth. This positive feedback loop is one of the strongest arguments for bitcoin's long-term viability as a store of value. Unlike traditional financial systems that rely on legal and institutional safeguards, Bitcoin's security is grounded in physical and economic costs that scale with network participation. The rising costs and competition among miners also help strengthen Bitcoin's security, alongside factors such as demand, liquidity, and network activity. As mining difficulty adjusts and efficient miners survive while weaker ones capitulate, the network tends to become more concentrated among well-capitalized, professional operators — further raising the barrier to attack.
Context in the Current Security Landscape
The Schwab analysis provides a counterpoint to the recent wave of crypto security concerns. The Coldcard hardware wallet exploit that drained $89 million across 4,500 wallets, the FBI agent arrested for stealing crypto, and the Solana Foundation's warning about AI deepfakes have all highlighted vulnerabilities in the broader crypto ecosystem. However, these threats have primarily targeted individual users, wallet software, and human trust — not the Bitcoin protocol itself. Schwab's analysis reinforces the distinction between Bitcoin's robust network-level security and the ongoing challenges of securing the applications and services built on top of it.
Implications for Investors
For institutional investors considering bitcoin exposure, the self-reinforcing nature of Bitcoin's security is an important factor. It suggests that the network's fundamental security improves over time without requiring protocol changes or centralized intervention — a property that distinguishes Bitcoin from many other digital assets. While individual wallets, exchanges, and bridges remain vulnerable to various attack vectors, the base layer of the Bitcoin network continues to strengthen with each incremental increase in hashrate. For long-term holders, that is a reassuring foundation.
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