Queried by: developersanalyticswallets
The Big Picture
The canonical chain height. Increments by 1 each block.
Use Cases
- Track chain progress
- Calculate time from blocks
From Chain Metadata
The current block number being processed. Set by `execute_block`.
Purpose & Usage
Purpose
Track chain height.
Common Query Patterns
- Single value query
Stored Value
value (u32)
Default Value
0 0x00000000
Absent keys read as this value — querying a key that has never been written returns this default, not an error or empty result.
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 Number storage (no keys - plain value)
const result = await api.query.System.Number.getValue();
console.log("Number:", result);Runtime Info
- Pallet
- System
- Storage Kind
- Plain
- First Version
- v101
- Current Version
- v472