Cleared

Event v133 → current #2

A preimage has been cleared.

View events on chain
Useful for: validatorsanalyticsdevelopers

The Big Picture

Frees storage and returns deposit.

Use Cases

  • Track cleanup

From Chain Metadata

A preimage has ben cleared.

Triggers

Preconditions

  • Preimage exists
  • Not requested

Effects

Postconditions

  • Data removed
  • Deposit returned

Event Data

#NameTypeDescription
0
hash
H256 hash (H256)

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

Runtime Info

Pallet Index
14
Event Index
2
First Version
v133
Current Version
v393
Back to Preimage Events