Quantum exposed: this address has revealed its public key in a prior spend. A sufficiently powerful quantum computer could derive the private key.
pubkey 0421a28903cf3693704f9979826addab230063252b1f02622852614cd0770f3519959a4c1f82d2c7ef523947306f60699e3c9694cd8b4f8e210e98261b113359fe