The developments address the hypothetical "Q-Day" when powerful quantum computers could use Shor's algorithm to derive private keys from exposed public keys, potentially draining wallets. While Q-Day remains theoretical and likely years away, the field is shifting from theory to practical logistics. StarkWare achieved a cost breakthrough, reducing the estimated cost of a quantum-safe Bitcoin transaction from approximately $320 to about $67. Coinbase's head of cryptography detailed the exchange's efforts to build post-quantum custody solutions for its roughly $250 billion in assets. Additionally, researchers published a new "Zcash-style" design for shielded Bitcoin transfers to enhance privacy.