UpgradeAuthorized

Event v151 → current #6

Emitted when a runtime upgrade is authorized for future application.

Useful for: validatorsdevelopersanalytics

The Big Picture

The authorize/apply pattern separates upgrade approval from execution. This event fires when the approval happens. Watch for CodeUpdated to know when it's actually applied.

Use Cases

Monitor governance-approved upgrades
Track pending runtime changes
Alert when upgrades are authorized

From Chain Metadata

An upgrade was authorized.

Triggers

Emitted by

authorize_upgrade authorize_upgrade_without_checks

Preconditions

Caller is root/sudo
Valid code hash provided

Effects

Storage Modified

AuthorizedUpgrade

Postconditions

Upgrade hash stored in AuthorizedUpgrade storage
Anyone can now apply the upgrade with matching code

Side Effects

Previous authorization (if any) is overwritten

Event Data

#	Name	Type	Description
0	code_hash	H256	Blake2-256 hash of the authorized runtime code
1	check_version	bool	Whether version checks will be performed on application

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

Runtime Info

Pallet Index: 0
Event Index: 6
First Version: v151
Current Version: v393

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