🔎 Quick Summary
⚠️ Not an immediate threat: quantum computing still does not have the capability to break Bitcoin — the risk is medium to long term.
🌍 The internet would fall first: banks, governments, and global systems would be affected before Bitcoin itself.
🧠 Part of BTC may be exposed: up to 35% of the supply is in potentially vulnerable formats, especially old wallets and reused addresses.
Recent reports, such as those from Ark Invest, make it clear: the danger exists, but it is not imminent. Still, it is serious enough to mobilize investors, developers, and even governments.
🧠 What is really at stake?
Bitcoin’s security is based on advanced cryptography, especially through the use of:
• Private keys (the user’s absolute secret)
• Public keys (visible on the blockchain)
• ECDSA digital signatures, which verify transaction authenticity
Today, traditional computers cannot break this system within a viable timeframe. However, quantum computers completely change this logic.
Using algorithms like Shor’s, these machines could theoretically perform reverse engineering, allowing them to derive the private key from the public key — opening the door to fraud and fund theft.
⚠️ Where is the real vulnerability?
Interestingly, the greatest risk does not lie in the well-known SHA-256 algorithm (which secures mining), but rather in the exposure of public keys.
➡️ Whenever a public key is revealed on the blockchain, it becomes a potential future target.
This explains why:
• Reused addresses are more vulnerable
• Old wallets (such as P2PK) are especially exposed
• About 34% to 35% of Bitcoins may be at theoretical risk
Among these amounts:
• 1.7 million BTC are considered lost
• 5 million BTC are in reused addresses
• Around 1 million BTC belong to Satoshi Nakamoto, the architect of Bitcoin
🧮 The threat is real, but not immediate
According to Ark Invest, current quantum computers are still limited:
• They operate with around 100 qubits
• They have high error rates
• They are in the so-called NISQ phase (Noisy Intermediate-Scale Quantum)
To break Bitcoin, it would require:
• More than 2,300 logical qubits
• The execution of billions of quantum operations
In other words: a massive technological leap that has not yet been achieved.
Additionally, there is another key factor:
💰 The cost of a quantum attack would reach billions of dollars, potentially taking months or years — making it economically unviable.
🌍 Before Bitcoin, the entire world would feel the impact
A central point of the report:
If quantum computing reaches that level, the entire internet would be affected first.
This includes:
• Banks
• Government systems
• Technology companies
• Global infrastructures
In other words, Bitcoin would not be the first target — it would be part of a broader digital crisis.
🧠 Experts divided: warning or confidence?
📉 More pessimistic view
Strategist Christopher Wood, from Jefferies, even recommended:
➡️ Reducing Bitcoin exposure by 10% and moving into gold
This statement alarmed investors and impacted the market.
📈 Optimistic view
Michael Saylor, one of Bitcoin’s largest investors, states:
“Quantum computing will not break Bitcoin — it will strengthen it.”
According to him:
• The network will adapt through updates
• Active coins will migrate to more secure systems
• Lost coins will remain inaccessible
This could even reduce circulating supply, increasing value.
⚖️ Intermediate position
Vitalik Buterin, co-founder of Ethereum, warns:
• There is about a 20% chance that dangerous quantum computers could emerge before 2030
• The threat is no longer science fiction
• Preparation must begin now
🛠️ Bitcoin’s response has already begun: the rise of BIP-360
The community is not standing still. Following the principle of continuous network improvement, launched in March this year, BIP-360 is one of the most important initiatives and:
• Introduces the P2MR model (Pay-to-Merklegen)
• Eliminates paths that expose public keys
• Drastically reduces the risk of future attacks
👉 This is the first formal inclusion of quantum resistance in Bitcoin’s roadmap.
⏳ There is time to react — and that makes all the difference
According to experts:
• A practical threat may take 5 to 10 years (or more)
• Quantum progress will be gradual and visible
• This allows Bitcoin to evolve over time
Additionally, Satoshi Nakamoto himself anticipated this scenario and argued that the system could be updated as needed.
🧾 How to protect yourself now
Even without an immediate threat, some practices are recommended:
• ✅ Never reuse addresses
• ✅ Use updated wallets
• ✅ Follow protocol updates
• ✅ Migrate to new formats when available
🔎 Conclusion: real risk, but manageable
Quantum computing is not an immediate threat to Bitcoin, but it represents one of the greatest long-term challenges the network has ever faced.
The good news?
👉 The problem is already known
👉 Solutions are already being developed
👉 And time is still on the side of adaptation
In the end, Bitcoin’s future may not be threatened by quantum computing — but rather shaped by it.
Want to dive deeper into this topic?
Check out the original sources used as a basis for this article:
- Ark Invest Report: The impact of quantum computing on the Bitcoin ecosystem.
- Cointelegraph Analysis: Everything about BIP-360 and the new era of quantum resistance.