PreimageFor

Storage Map v133 → current

Actual preimage data stored by (hash, length).

Explore chain

Queried by: validatorsdevelopers

The Big Picture

The raw bytes of stored governance call data.

Use Cases

Retrieve call data
Decode governance proposals

Purpose & Usage

Purpose

Store the call data for governance proposals.

Common Query Patterns

Query by (hash, len) tuple

Query Keys

#	Name	Type	Description
1	key1	H256	key1 (H256)
2	key2	u32	key2 (u32)

Stored Value

BoundedVec

value (BoundedVec)

Relationships

Modified By

ensure_updated note_preimage unnote_preimage

Related Events

Cleared Noted

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 });

// Query PreimageFor storage
const key1 = 0 as any /* H256 */;
const key2 = 0;

const result = await api.query
  [stringCamelCase("Preimage")]
  [stringCamelCase("PreimageFor")](
  key1,
  key2
);

console.log("PreimageFor:", result.toHuman());

Runtime Info

Pallet: Preimage
Storage Kind: Map
First Version: v133
Current Version: v393

Back to Preimage Storage