Blockchain & quantum

What quantum computing means for Bitcoin and other blockchains: exposed keys, honest timelines, and post-quantum chain designs.

5 entries

Is Bitcoin quantum safe?An evidence-based look at Bitcoin's quantum exposure: which coins have revealed public keys, how fast an attacker must be, and the proposed fixes.
Post-quantum blockchains (survey)A neutral survey of post-quantum signatures on blockchains, from QRL, Algorand, and BTX to Bitcoin and Ethereum research, with schemes and status compared.
Quantum computers and proof-of-work miningGrover's algorithm gives only a quadratic speedup on proof-of-work hashing, so quantum mining stays impractical against ASIC fleets for the foreseeable future.
Quantum threat to ECDSAShor's algorithm solves the elliptic curve discrete logarithm behind ECDSA in polynomial time; published estimates need about 2330 logical qubits.
Taproot and quantum key exposureTaproot P2TR outputs place an x-only public key directly on chain, so taproot coins are quantum-exposed at rest, unlike hash-guarded legacy addresses.