Quantum exposed: this address has revealed its public key in a prior spend. A sufficiently powerful quantum computer could derive the private key.
pubkey 0421c7091de13fb7a445b196918729261f6708236540c1e8052af31d0f5eeb1340baed20d556769a62091d82da17767f381aa4cf031316cefcf4cac89e4c6973ca