Quantum exposed: this address has revealed its public key in a prior spend. A sufficiently powerful quantum computer could derive the private key.
pubkey 042421f544f8f821ab70ce2d457dd8aaabdcd09d4bc1a3c3e49443df1c8876e5a2fbe4b87e0f194dc82ebb210a3046cc0248603e88170ab985100b7dd1747805a9