Research Shows a Week-Long 51% Attack on Bitcoin Network Would Cost $6 Billion

Written by Ohris M. Greyoon, Blockchain & Crypto Expert

Source: Coinmarketcap

Updated: Oct 13 2025

BTC-4.198%

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Bitcoin's Security Threats: Bitcoin is facing potential security threats, particularly from quantum computers and the risk of a 51% attack, which could allow attackers to control the blockchain and manipulate transactions.
Cost of a 51% Attack: Professor Campbell Harvey estimates that a successful 51% attack on Bitcoin could cost around $6 billion, which is less than 0.5% of Bitcoin's market capitalization, raising concerns about the feasibility of such an attack despite the high costs involved.

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Technical Analysis for BTC

Technical Sentiment Analysis for Bitcoin (BTC). As of , Bitcoin (BTC) is exhibiting a Neutral technical sentiment. Our proprietary analysis, which aggregates 3 technical signals, shows that 2 indicators are flashing buy, while 1 are indicating sell.

Momentum Indicators: RSI, MACD & Overbought/Oversold Status. Currently, the Relative Strength Index (RSI) for BTC stands at -, which suggests a Neutral condition. Meanwhile, the MACD (12, 26) indicator is at -, providing a Neutral signal for short-term momentum. Other oscillators like the Stochastic Oscillator at - and the Commodity Channel Index (CCI) at - further confirm a - outlook for the crypto.

Support, Resistance & Moving Averages. From a structural perspective, BTC is trading below its 60-day moving average of $- and below its 200-day long-term moving average of $-. Key price levels to watch include the immediate resistance at $- and strong support at $-. A break above $- could signal a bull continuation, while falling below $- may test the next Fibonacci floor at $-.

Bitcoin (BTC) Support & Resistance Level

Name	S3	S2	S1	Pivot Points	R1	R2	R3
Classic	51856.679	57443.339	62876.679	68463.339	73896.679	79483.339	84916.679
Fibonacci	57443.339	61652.979	64253.699	68463.339	72672.979	75273.699	79483.339

About BTC

Bitcoin is a decentralized cryptocurrency originally described in a 2008 whitepaper by a person, or group of people, using the alias Satoshi Nakamoto. It was launched soon after, in January 2009.Bitcoin is a peer-to-peer online currency, meaning that all transactions happen directly between equal, independent network participants, without the need for any intermediary to permit or facilitate them. Bitcoin was created, according to Nakamoto’s own words, to allow “online payments to be sent directly from one party to another without going through a financial institution.”Some concepts for a similar type of a decentralized electronic currency precede BTC, but Bitcoin holds the distinction of being the first-ever cryptocurrency to come into actual use.

About the author

Ohris M. Greyoon

Ohris M. Greyoon holds a Master’s in Computer Science from MIT and has 10 years of experience in blockchain technology and cryptocurrency markets. A pioneer in decentralized finance (DeFi) analysis, he leads Intellectia’s Crypto News, offering cutting-edge insights into digital assets.

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