Just a question on token event reading.

[miguelmota]

Just a question on token event reading.

[miguelmota]

@yueawang Thanks! and sorry it's not clear; the topics are indexed event arguments.

There can only be a maximum of 4 topics, the first topic is the event log signature hash.
The other 3 are optional and specified by the contract creator by using the indexed keyword.

Unpack unpacks the log data. The log data contains event arguments that are not indexed.
The log event signature is: event Transfer(address indexed from, address indexed to, uint tokens); and as you can see from and to are indexed while tokens is not.
So from and to are topics[1] and topics[2] respectively

Hope this makes sense

[yueawang]

Thanks @miguelmota , that's crystal clear! 👍