The quantum threat to crypto targets wallet signatures, not mining, researchers say

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Analytics Insight takes a more technical angle on the same quantum crypto story, drawing a sharp distinction between mining and wallet signatures that a lot of the other coverage glosses over. Bitcoin mining relies on SHA-256 hashing, and Grover's algorithm only offers a square root speedup against hash functions, which leaves 256 bit hashes with roughly 128 bit effective security, still well beyond practical attack range even with a capable quantum computer

The actual vulnerability sits with digital signatures instead, since Bitcoin and Ethereum both rely on ECDSA and Solana uses EdDSA, and Shor's algorithm could theoretically solve the underlying math behind those schemes given enough stable qubits. That distinction matters because a quantum attacker would not be decrypting coins stored on chain, they would be forging a valid signature after somehow obtaining an exposed public key

On timelines, the piece cites Citi Institute placing the odds of a cryptographically relevant quantum computer at roughly 19 to 34 percent by 2034, rising to 60 to 82 percent by 2044. Google has separately cut its own estimate for breaking 256 bit elliptic curve cryptography down to about 1200 logical qubits, though today's processors are still working with noisy physical qubits and error correction remains the central bottleneck holding real machines back

The article leans on something called Mosca's theorem to frame the actual planning question, which weighs how long your data needs to stay secure against how long migration takes and when a capable quantum computer might realistically arrive. That framing matters most for long term holdings like cold storage, inheritance plans and dormant wallets that could sit exposed for years before anyone gets around to moving them

Ethereum's own roadmap reportedly targets full post quantum protection around 2029 as well. Putting it roughly in line with Google's internal migration target, so at least on the timeline question there seems to be some rough consensus forming across different corners of the industry

Quantum Threat to Crypto Is Real as Migration Window Narrowswww.analyticsinsight.net