Key Highlights
- Quantum computers could expose ZEC and XMR transactions, threatening users’ privacy and anonymity.
- Bitcoin’s legacy addresses face minor quantum risk, but upgrades and hidden keys keep most funds safe.
- Upcoming Bitcoin upgrades, called a “Quantum Leap,” will boost security while keeping the network stable.
Privacy-focused cryptocurrencies Zcash (ZEC) and Monero (XMR) face risks as quantum computing technology advances. Veteran crypto researcher Justin Bons warned that these coins’ cryptography could be vulnerable to quantum attacks.
In a recent X post, Bons explained that whenever someone spends ZEC or XMR, their public key becomes visible on the blockchain. This means that, in the future, super-powerful quantum computers could figure out the private key behind it.
If that happens, hackers could trace transactions back to the real person, breaking the privacy these coins are supposed to provide. Because of this risk, Bons recommends using mixing services that don’t rely on zero-knowledge proofs, as they offer stronger protection for long-term privacy.
Bons emphasized that mixers pool and redistribute coins among multiple users, making ownership tracing more difficult. “Some mixers may resist quantum computer attacks better and should be embraced,” he said, stressing that certain individuals’ lives might depend on this anonymity.
Quantum risks beyond privacy coins
The risk isn’t just for privacy coins. Another expert, Coinbase analyst David Duong, warned that future quantum computers could also threaten Bitcoin and other blockchains’ core security systems. Duong explained that once these machines reach what’s called a “Q-day,” they could weaken Bitcoin’s cryptography. He added that this includes the ECDSA used for transaction signatures and SHA-256, which secures Bitcoin mining.
Duong explained that quantum computers could use Shor’s algorithm to turn public keys back into private keys. This weakness could let hackers steal coins from exposed addresses. However, most modern Bitcoin addresses hide public keys, which lowers the immediate risk.
CoinShares recently noted that only a small number of older legacy addresses are still vulnerable, and today’s quantum machines don’t have enough qubits to break them. They emphasized that Bitcoin’s network is designed to allow smooth upgrades to quantum-resistant signatures, keeping it resilient against future quantum threats.
Meanwhile, Strategy co-founder Michael Saylor tried to calm fears, calling the situation a “Bitcoin Quantum Leap.” He said that upcoming upgrades would boost security while keeping the network intact. Saylor added that active coins would migrate to safer addresses, lost coins would remain frozen, and the effective supply would shrink, ultimately strengthening protection.
Quantum technology might still be a way off, but the warnings are urgent. Privacy coins like ZEC and XMR could face real threats, and taking precautions early could make all the difference. As Bons said, when “lives depend on it,” using advanced strategies becomes absolutely essential.
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