Quantum exposed: this address has revealed its public key in a prior spend. A sufficiently powerful quantum computer could derive the private key.
pubkey 04211fbf71a2f1a01682239c195f1813c9ac247ee556e72fe8d7deef9fb4ae6b2443665eba9f1f29fcf4febac255a48febbea44e5e40ab90b6e33e0d0ee532ad54