Spend (index_topic_1address user, index_topic_2address product, uint256 value)
[topic 0]:0x7c2b9369bf4a6bd9745889c658ad00a4d57e280c4c80fa1c74db2a9e52c13635
0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000d568a4963742a3a9fa25d84c01d36417f97e3bdc000000000000000000000000000000000000000000000000001f9e80ba804000