Privacy coins posted sharp gains on May 21, led by Zcash, up roughly 7%, and QRL, up 25%. Qubitcoin and Starknet also moved higher, pushing the sector’s total market capitalization close to $63 billion. Trading activity accelerated as well, with 24-hour volume rising about 24% to $4.7 billion.
The rally was tied to a clear rotation in market positioning. Investors shifted toward tokens that combine financial privacy with post-quantum security architecture. A recent Glassnode report added force to that move after classifying 9.6% of Bitcoin’s supply as exposed to quantum risk, drawing attention to assets built around quantum resistance from the start.
Zcash and QRL climbed for different reasons
Zcash has gained more than 73% over the past month, while the broader crypto market rose only 0.2% over the same period. That gap points to a change in how the market is valuing the asset. The report noted that Zcash’s zero-knowledge proof technology now sits beneath major Ethereum layer-2 networks, which has helped shift its price action away from pure speculation.
QRL’s move came from a different setup. The token was designed specifically to resist quantum attacks, using lattice-based cryptography instead of the elliptic curve system used by Bitcoin. For traders rotating into this theme, QRL represents infrastructure built for a scenario in which quantum computing becomes a direct security issue for existing chains.
Quantum risk estimates sharpened the trade
The report also referenced research suggesting that breaking Bitcoin’s elliptic curve cryptography would require about 2,330 logical qubits. Citi’s analysis added a broader economic frame, concluding that a quantum attack could put $2 trillion to $3.3 trillion of GDP at risk. That has left the market with only a small group of liquid tokens carrying a clear quantum-resistant narrative, including QRL, Zcash, and related names.
Even after the move, the sector remains small relative to the scale of the perceived risk. That imbalance has become part of the pricing story, and the gains on May 21 showed how quickly capital can flow into privacy and post-quantum tokens when the theme regains traction.