Quantum Computing and Crypto in 2026: Hype vs Reality

While major tech firms are accelerating quantum research, experts widely believe that a quantum computer capable of breaking current cryptocurrency cryptography, like Bitcoin's ECDSA signatures, is at least a decade away, making a 2026 collapse highly improbable due to significant physics and engineering barriers.

The immediate, real threat is the "harvest now, decrypt later" scenario, where adversaries are already collecting encrypted data, including exposed Bitcoin public keys, to decrypt once powerful quantum machines exist. Estimates suggest 25% to 30% of all BTC are in vulnerable addresses whose public keys are already on-chain.

In response, the crypto community is preparing by developing quantum-resistant signature alternatives and migration plans. Users are advised to avoid address reuse to minimize exposure, as the conversation shifts from *if* quantum computing will pose a risk to *when* it will become a top-tier security concern.

(Source：Cointelegraph)