Quantum exposed: this address has revealed its public key in a prior spend. A sufficiently powerful quantum computer could derive the private key.
pubkey 0421d8523af9191965082c664525e0c52e848adf3eabdda8009b953e7c2044f18e4afd8bba0459a2147b585516c0ad45a517890258c8373b3e7645837a91e9e8e2