TransferSingle event signature and topic0

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

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

const logs = await client.getLogs({
  address: "0xYourContractAddress",
  event: parseAbiItem("event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value)"),
  fromBlock: "latest",
})

for (const log of logs) console.log(log.args) // { operator, from, to, id, value }

import { Interface, JsonRpcProvider } from "ethers"

const provider = new JsonRpcProvider(process.env.RPC_URL)
const iface = new Interface(["event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value)"])

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

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

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "eth_getLogs",
  "params": [
    {
      "address": "0xYourContractAddress",
      "topics": [
        "0xc3d58168c5ae7397731d063d5bbf3d657854427343f4c083240f7aacaa2d0f62"
      ],
      "fromBlock": "latest"
    }
  ]
}

event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

// inside a function:
emit TransferSingle(operator, from, to, id, value);