Currently, many ill-intentioned people or inexperienced individuals are spreading FUD about Bitcoin, primarily focusing on two claims: "quantum computers can crack it," and "Bitcoin halving makes mining unprofitable." In fact, these are simply parroted ideas without in-depth understanding:

Theoretically, if one could effectively control a quantum computer with around 1500 qubits, it is indeed possible to use the "Shor's" algorithm to crack and reverse-engineer a BTC address's private key based on elliptic curve algorithms in about 20 minutes. However, building such a quantum computer is not as simple as assembling a desktop with a sea view in Huaqiangbei;

The most advanced technology for effectively controlling the "decoherence state" and "zero-noise extrapolation," as well as "probabilistic error elimination," currently only manages to create quantum computers with fewer than 100 qubits;

The cost of controlling qubits is exponential. Current estimates suggest that maintaining a quantum computer capable of stably running 1500 qubits can cost up to 1 billion dollars a day, requiring an extremely high-quality hardware environment, including "ultra-low temperature (mK level)," magnetic shielding, vacuum environments, defect and quasi-particle filtering, microwave leakage suppression, and large system refrigeration. This not only demands stringent facilities but also requires vast amounts of electricity. A quantum computer that can crack BTC private keys would need gigawatts of power daily, making the cost of cracking far exceed the value of any BTC obtained;

As of now (2026), the world's largest system claims it can achieve hundreds of physical qubits but has yet to reach fault tolerance and can only operate briefly in a laboratory setting. A machine capable of cracking BTC may take 10 to 20 years or more to build and would likely be limited to only a few countries or institutions.

The claim that Bitcoin halving makes mining unprofitable is even more ridiculous. The current block reward is 3.125 → 1.5625 (28 years) → 0.78125 (32 years). As BTC continues to halve and the frequency of BTC network transactions diminishes, it seems that BTC mining may indeed become unprofitable;

However, with the rising price of BTC, this argument is naive. At the current price of 65,000 dollars, the income from mining a block is 3.125 * 65,000 = 200,000 dollars. If the price after the next halving is 130,000, then the income from mining a block is still 200,000 dollars. If by 2032 BTC rises to 260,000, the revenue from mining a block would still be 200,000 dollars. As BTC prices continue to rise, miners will always find profitability!

Moreover, BTC reaching 1 million dollars is not far off in the future...

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