Here's a snapshot from etherscan.io

enter image description here


topics[0] is the hash of the signature of the event.

Example from Solidity docs:

keccak256("Deposit(address,bytes32,uint256)") is the signature of the event:

event Deposit(
        address indexed _from,
        bytes32 indexed _id,
        uint _value
  • this is a keccak_256 hash right? – garg10may Sep 18 '17 at 14:21
  • @garg10may Yes, most Solidity docs have now updated to keccak256. It will take time for other places like answers here to be updated: thanks for pointing this one out. – eth Sep 20 '17 at 9:30

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