def keys():
Returns True if a_key was used to generate a_sig from a_hash_for_sig;
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/zope/zope/interface/common/mapping.py/IEnumerableMapping.keys--crossover with--dataset/ETHPy150Open richardkiss/pycoin/tests/sighash_single_test.py/sigcheck