Event signature · Governance

VoteCastWithParams event signature and topic0

The topic0 of the VoteCastWithParams event is 0xe2babfbac5889a709b63bb7f598b324e08bc5a4fb9ec647fb3cbc9ec07eb8712, the keccak-256 hash of VoteCastWithParams(address,uint256,uint8,uint256,string,bytes); 1 of its 6 arguments is indexed. Governance vote carrying extra ballot params (Governor).

Anatomy of a VoteCastWithParams log

Topics

topic00xe2babfbac5889a709b63bb7f598b324e08bc5a4fb9ec647fb3cbc9ec07eb8712keccak256("VoteCastWithParams(address,uint256,uint8,uint256,string,bytes)")
topic1voter (address)indexed: filterable

Data

dataproposalId (uint256), support (uint8), weight (uint256), reason (string), params (bytes)ABI-encoded, decoded with the ABI

Parameters

Arguments and where they sit in the log

Indexed arguments travel as topics and can be filtered cheaply; the others are ABI-encoded together in the data.

Name	Type	In the log
voter	address	topic1
proposalId	uint256	data
support	uint8	data
weight	uint256	data
reason	string	data
params	bytes	data

Solidity declaration

event VoteCastWithParams(address indexed voter, uint256 proposalId, uint8 support, uint256 weight, string reason, bytes params);

Canonical signature

VoteCastWithParams(address,uint256,uint8,uint256,string,bytes)

topic0

0xe2babfbac5889a709b63bb7f598b324e08bc5a4fb9ec647fb3cbc9ec07eb8712

Ready-made alerts

Get an alert on VoteCastWithParams

Each rule opens with the contract and the conditions filled in. Sign in, pick your chat and click Create.

Ready-made rule · Compound GovernorCompound DAO votes cast

Ready-made rule · Compound GovernorAlert on every VoteCastWithParams

Ready-made rule · Any contractAlert on VoteCastWithParams from a contract you pick

Who emits it

Contracts we list that emit VoteCastWithParams

Any other contract with the same signature emits a log with the same topic0.

Compound Governor

0x309a862bbc1a00e45506cb8a802d1ff10004c8c0

Tracker: Compound dao proposal alerts

Code

Read VoteCastWithParams logs in code

The same filter in viem, ethers and plain JSON-RPC, and the Solidity that emits it. The address is Compound Governor, a contract we list that emits it.

viem

import { createPublicClient, http, parseAbiItem } from "viem"
import { mainnet } from "viem/chains"

const client = createPublicClient({ chain: mainnet, transport: http() })

const logs = await client.getLogs({
  address: "0x309a862bbc1a00e45506cb8a802d1ff10004c8c0",
  event: parseAbiItem("event VoteCastWithParams(address indexed voter, uint256 proposalId, uint8 support, uint256 weight, string reason, bytes params)"),
  fromBlock: "latest",
})

for (const log of logs) console.log(log.args) // { voter, proposalId, support, weight, reason, params }

ethers v6

import { Interface, JsonRpcProvider } from "ethers"

const provider = new JsonRpcProvider(process.env.RPC_URL)
const iface = new Interface(["event VoteCastWithParams(address indexed voter, uint256 proposalId, uint8 support, uint256 weight, string reason, bytes params)"])

const logs = await provider.getLogs({
  address: "0x309a862bbc1a00e45506cb8a802d1ff10004c8c0",
  topics: [iface.getEvent("VoteCastWithParams")!.topicHash],
})

for (const log of logs) console.log(iface.parseLog(log)?.args)

JSON-RPC (eth_getLogs)

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_getLogs",
  "params": [
    {
      "address": "0x309a862bbc1a00e45506cb8a802d1ff10004c8c0",
      "topics": [
        "0xe2babfbac5889a709b63bb7f598b324e08bc5a4fb9ec647fb3cbc9ec07eb8712"
      ],
      "fromBlock": "latest"
    }
  ]
}

Solidity

event VoteCastWithParams(address indexed voter, uint256 proposalId, uint8 support, uint256 weight, string reason, bytes params);

// inside a function:
emit VoteCastWithParams(voter, proposalId, support, weight, reason, params);

Example

An example VoteCastWithParams log, encoded and decoded

Placeholder values, not a real transaction: how each argument is stored in the topics and the data, and what decoding gives back.

Encoded (as the node returns it)

topic0keccak256("VoteCastWithParams(address,uint256,uint8,uint256,string,bytes)")0xe2babfbac5889a709b63bb7f598b324e08bc5a4fb9ec647fb3cbc9ec07eb8712
topic1voter0x0000000000000000000000001111111111111111111111111111111111111111
data0x00000000000000000000000000000000000000000000000000000000000007d000000000000000000000000000000000000000000000000000000000000000030000000000000000000000000000000000000000000000000000000000000fa000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e000000000000000000000000000000000000000000000000000000000000000076578616d706c65000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002abcd000000000000000000000000000000000000000000000000000000000000

Decoded with the ABI

voteraddress · indexed0x1111111111111111111111111111111111111111
proposalIduint2562000
supportuint83
weightuint2564000
reasonstringexample
paramsbytes0xabcd

FAQ

Frequently asked questions

What is the topic0 of the VoteCastWithParams event?

0xe2babfbac5889a709b63bb7f598b324e08bc5a4fb9ec647fb3cbc9ec07eb8712: the keccak-256 hash of VoteCastWithParams(address,uint256,uint8,uint256,string,bytes).

Which VoteCastWithParams arguments are indexed?

voter is indexed and sit in the log's topics; proposalId, support, weight, reason, params are in the data.

How do I get an alert when a contract emits VoteCastWithParams?

Open one of the ready-made rules on this page, or add any contract and pick VoteCastWithParams from the event list. Conditions can be set on indexed and non-indexed arguments, and each alert names the contract and links to the transaction.

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