CodeRemoved

Event v334 → current #4

Emitted when contract code is removed from on-chain storage .

View events on chain

Useful for: developersanalytics

The Big Picture

When code is no longer needed, the uploader can remove it to reclaim their deposit.

Use Cases

Track code cleanup
Monitor storage reclamation
Update code registries

From Chain Metadata

A code with the specified hash was removed.

Triggers

Emitted by

remove_code

Preconditions

Code exists
No contract instances reference this code
Caller is original uploader

Effects

Storage Modified

CodeInfoOf PristineCode

Postconditions

Code removed
CodeInfoOf cleared
Deposit refunded

Side Effects

Code hash no longer available for instantiation

Event Data

#	Name	Type	Description
0	code_hash	H256	Hash of the removed code
1	deposit_released	u64	Amount of deposit refunded (RAO) (RAO -> TAO (/ 10^9))
2	remover	AccountId	Account that removed the code (original uploader) (hex -> SS58)

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

Runtime Info

Pallet Index: 29
Event Index: 4
First Version: v334
Current Version: v393

Back to Contracts Events