StakeCollateral (index_topic_1address from, index_topic_2address to, bytes32 collateralKey, uint256 collateralAmount)
[topic 0]:0xa6bf5262c311ff2cca4aaf9e52d13d0a1fe98368ed7832123620844628768347
0x55534443000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000034f086f3b33b68400000