bitcoin core has zero formal BIP for quantum-resistant signatures with community consensus. implementation takes 2-4 years minimum. google's shor's algorithm improvement projects secp256k1 cracked by 2029. if no BIP emerges by Q3 2026, the math doesn't work. that's 6 months from now. the mempool attack vector is the part people miss. even coins in "safe" P2PKH addresses expose your public key the moment you broadcast a spend transaction. a quantum attacker monitoring the mempool cracks your key and front-ru ...