Quantum exposed: this address has revealed its public key in a prior spend. A sufficiently powerful quantum computer could derive the private key.
pubkey 04211d3a3147a250480f6132a216d6f671b55d991ef3deda8fcd2bf7816769867eaa776c70c797d35e72ab633e8dde9707e16b02fd29b2782380fd4f602585048c