Quantum exposed: this address has revealed its public key in a prior spend. A sufficiently powerful quantum computer could derive the private key.
pubkey 0421cb386b8b00e3268871a803a3ea259c3f7dad82d67a3690b69fa755a138ce47a7a46a88a8c9fea58dab010c808cbd4f31015f0271c9ab6ec2448bc5278adc95