Queried by: validatorsdevelopers
The Big Picture
Part of block header. Links each block to its parent.
Use Cases
- Verify block lineage
From Chain Metadata
Hash of the previous block.
Purpose & Usage
Purpose
Link to parent block in chain.
Common Query Patterns
- Single value query
Stored Value
value (H256)
Code Examples
import { createClient, Binary } from "polkadot-api";
import { getWsProvider } from "polkadot-api/ws";
import { sub } from "@polkadot-api/descriptors"; // generated by: npx papi add sub -w wss://entrypoint-finney.opentensor.ai:443
const client = createClient(getWsProvider("wss://entrypoint-finney.opentensor.ai:443"));
const api = client.getTypedApi(sub);
// Query ParentHash storage (no keys - plain value)
const result = await api.query.System.ParentHash.getValue();
console.log("ParentHash:", result);Version History
v101 block 1 Added
v149 block 3,014,339 Internal re-bind
v151 block 3,157,274 Internal re-bind Current
Runtime Info
- Pallet
- System
- Storage Kind
- Plain
- First Version
- v101
- Current Version
- v411