🔐 SECURITY: Bitcoin just confirmed a quantum-resistant mainnet transaction without changing consensus rules. The catch: the workaround is costly, nonstandard and only helps coins whose public keys remain hidden. Roughly 7M BTC with exposed keys still need a broader protocol-level solution. https://cryptoslate.com/bitcoin-now-has-a-quantum-computing-escape-route-but-7-million-btc-may-still-be-exposed/(CryptoSlate)