FirstEmissionBlockNumber

Storage Map v257 → v411

Block number of first emission for a subnet .

Queried by: subnet ownersanalyticsdevelopers

The Big Picture

Marks when a subnet first started receiving emissions. Different from registration block - a subnet may be registered before emissions begin. Useful for calculating how long emissions have been flowing.

Use Cases

Calculate subnet age from emission start
Track emission history
Build subnet timeline tools

From Chain Metadata

============================ ==== Subnet Parameters ===== ============================ MAP ( netuid ) --> block number of first emission

Purpose & Usage

Purpose

Track when a subnet started receiving emissions.

Common Query Patterns

Query by netuid

Part of: TAO Flow

Query Keys

#	Name	Type	Description
1	netuid	u16	netuid (u16, hashed key component)

Stored Value

u64

block (u64)

RAO -> TAO (/ 10^9)

Relationships

Modified By

start_call

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 FirstEmissionBlockNumber storage
const netuid = 1;

const result = await api.query.SubtensorModule.FirstEmissionBlockNumber.getValue(netuid);
console.log("FirstEmissionBlockNumber:", result);

On-Chain Activity

Write Frequency

●●○○○○ Minimal <10K est. writes

<10K estimated writes

#65 most written storage item

Write Source User Extrinsics

Modified via user-submitted extrinsics

As of block 7,429,232

Version History

Version:

v257 block 5,228,683 Added

v278–v289 · runtime versions skipped on chain (never deployed)

v290 block 5,947,548 Internal re-bind Current

Runtime Info

View Source

Pallet: SubtensorModule
Storage Kind: Map
First Version: v257
Current Version: v411

Back to SubtensorModule Storage