A total of 1.7 million Bitcoin currently sits in addresses where the public key has been revealed on-chain, according to Starknet analysis. This exposure leaves these funds vulnerable to a future quantum computing attack.
Bitcoin addresses become vulnerable once their public key is broadcast during a transaction. For older Pay-to-Public-Key-Hash (P2PKH) addresses, the public key is explicitly disclosed when funds move. Anyone can derive the original public key from the transaction data.
Quantum attack timelines have compressed dramatically. Recent estimates suggest a 20x acceleration in the pace at which a theoretical quantum computer could derive private keys from exposed public keys—meaning the window to move these funds closes faster than previously calculated.
The immediate threat remains theoretical. No quantum computer yet exists that can break current cryptographic standards. But the shrinking timeline signals accelerating quantum research and rising pressure on Bitcoin holders with exposed keys.
The fix is straightforward: move funds to SegWit or Taproot addresses. These newer formats delay public key exposure until funds are spent and incorporate cryptographic designs resistant to known quantum attack vectors. For holders sitting on exposed keys, this move is no longer optional—it is urgent.
