Quantum-Proof Bitcoin Exists—If You're Willing to Pay $200 Per Transaction

A StarkWare researcher claims to have cracked the code on quantum-resistant bitcoin without touching the protocol. The catch? It'll run you up to $200 per transaction.

In a paper released this week, StarkWare researcher Avihu Levy unveiled Quantum Safe Bitcoin (QSB), a scheme that swaps ECDSA signatures for hash-based proofs. The approach survives quantum attacks that would demolish today's cryptography—but shifts the burden from consensus to raw computation. Think of it as replacing a handwritten signature with a tamper-proof fingerprint that's computationally painful to forge.

The scheme works entirely within Bitcoin's existing consensus rules. No soft fork, no miner signaling, no activation timeline. Compare that to BIP-360, the quantum-resistance proposal merged into Bitcoin's official improvement repository in February—still has no Core implementation and faces what could be years of governance gridlock.

But QSB isn't cheap. Generating a single transaction requires crunching through billions of candidates, which Levy estimates costs $75–$200 on commodity cloud GPUs. Normal bitcoin transactions? About 33 cents.

There are other headaches. QSB transactions likely can't travel through Bitcoin's normal blockchain. Users would probably need to hand them directly to miners willing to process them. Lightning Network and other Layer 2 solutions are out. Creating a transaction requires outsourcing heavy computation to external hardware—not exactly signing from your phone.

Levy describes QSB as a "last resort measure," not a protocol replacement. Scalable quantum-resistant signatures still depend on soft fork upgrades that could take years to activate. Polymarket bettors aren't optimistic about BIP-360 passing this year, and Bitcoin's track record offers little reason for optimism—Taproot took roughly seven