Quantum exposed: this address has revealed its public key in a prior spend. A sufficiently powerful quantum computer could derive the private key.
pubkey 0421a4b2176b201a55888baa5c1dabd0c3e0c5a03344b8900e4efe3d5606885e4d1d0eb37f8bbda17182f896a9e890b49ba4fc809f45b6227c1db7dcaa30178905