PrecompileUpdated

Event v238 → current #0

Emitted when an EVM precompile's enabled status is changed.

Useful for: developersvalidators

The Big Picture

EVM precompiles are special contracts at fixed addresses providing advanced functionality. This event tracks changes to which precompiles are active, important for EVM developers who may depend on specific precompile availability.

Use Cases

Monitor EVM precompile configuration changes
Track when new EVM features are enabled
Alert when precompiles are disabled for security

How to Use This Event

→ Subscribe to monitor EVM feature availability
→ Index to track precompile configuration history

From Chain Metadata

Event emitted when a precompile operation is updated.

Triggers

Emitted by

sudo_toggle_evm_precompile

Preconditions

Caller is root account
Valid precompile ID provided

Effects

Storage Modified

PrecompileEnable

Postconditions

PrecompileEnable storage updated for the precompile
EVM behavior changes based on new status

Side Effects

EVM contracts calling disabled precompiles will fail
May affect EVM dApp functionality

Event Data

#	Name	Type	Description
0	precompile_id	PrecompileEnum	Identifier of the EVM precompile being configured
1	enabled	bool	Whether the precompile is now enabled (true) or disabled (false)

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 PrecompileUpdated events
api.query.system.events((events) => {
  events
    .filter(({ event }) =>
      event.section === stringCamelCase("AdminUtils") &&
      event.method === "PrecompileUpdated"
    )
    .forEach(({ event }) => {
      console.log("PrecompileUpdated:", event.data.toHuman());
    });
});

Runtime Info

View Source

Pallet Index: 19
Event Index: 0
First Version: v238
Current Version: v393

Back to AdminUtils Events