proofSent (address sender, bytes32 emailHash)
[topic 0]:0xcf78a4d6dbe205849d9de761d25afabfd64d5129cf2620e5469d02dcd44c4a3d
0x0000000000000000000000008b84f6bb5e022266e5e0637c16ea8e5eda7950306b05145a5fbd8ce493c3717072193c6dbb8f1941d8db18edbc4d8c034b19ef19