TokensPurchased (index_topic_1address buyer, uint256 amount)
[topic 0]:0x8f28852646c20cc973d3a8218f7eefed58c25c909f78f0265af4818c3d4dc271
0x0000000000000000000000001b8ec2ba0634609e087eecd1951bef5eca89595e0000000000000000000000000000000000000000000000000000000000000001