Log

Event v210 → current #0

Emitted when an Ethereum smart contract emits a log event .

Useful for: developersanalytics

The Big Picture

Smart contracts emit events (logs) to communicate state changes. This is how dApps track token transfers, DEX swaps, and all contract activity on Bittensor's EVM.

Use Cases

Index ERC-20 events
Monitor contract activity
Build dApp listeners

From Chain Metadata

Ethereum events from contracts.

Triggers

Emitted by

call create create2

Preconditions

Smart contract is executing
Contract calls LOG opcode

Effects

Storage Modified

AccountCodes AccountCodesMetadata AccountStorages

Postconditions

Log recorded in block
Topics and data available for indexing

Event Data

#	Name	Type	Description
0	log	Log	Ethereum log entry containing address, topics, and data

Code Examples

import { ApiPromise, WsProvider } from "@polkadot/api";
import { stringCamelCase } from "@polkadot/util";

const provider = new WsProvider("wss://entrypoint-finney.opentensor.ai:443");
const api = await ApiPromise.create({ provider });

// Subscribe to Log events
api.query.system.events((events) => {
  events
    .filter(({ event }) =>
      event.section === stringCamelCase("EVM") &&
      event.method === "Log"
    )
    .forEach(({ event }) => {
      console.log("Log:", event.data.toHuman());
    });
});

On-Chain Activity

Emission Frequency

●●●○○○ Active 100K–1M emissions

Regular feature-level activity

#31 most emitted event

As of block 7,429,232

Runtime Info

Pallet Index: 22
Event Index: 0
First Version: v210
Current Version: v393

Back to EVM Events