Purchase (index_topic_1address beneficiary, uint256 contribution, uint256 amount)
[topic 0]:0x12cb4648cf3058b17ceeb33e579f8b0bc269fe0843f3900b8e24b6c54871703c
0x0000000000000000000000003df9d238f6e583508c3af0e5bb84f4308ec0d24500000000000000000000000000000000000000000000000000000000000000c700000000000000000000000000000000000000000000000004831ab7fd6f41d7