StakedCats (address staker, uint256 numCats)
[topic 0]:0x619cabb5bc14e79956913bc7c5db19f38cfff217471c0bb1a4d63408d08db69d
0x000000000000000000000000d840cd2d825e129dfd9021dc5f5a09cf32bb74100000000000000000000000000000000000000000000000000000000000000004