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Coinbase has published a quantum computing threat report identifying significant exposure risks for $BTC holders who reuse cryptocurrency addresses — a practice that leaves a wallet's public key exposed on-chain and potentially readable by a sufficiently powerful quantum computer.
The report puts a named mechanism on a risk the industry has long discussed in the abstract.
Why Address Reuse Is the Specific Problem When a Bitcoin address is used more than once, the public key associated with it becomes visible on the blockchain.
Under current cryptographic assumptions, deriving the corresponding private key from a public key is computationally infeasible.
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