Queried by: validatorssubnet ownersdevelopersanalytics
The Big Picture
Kappa is a Yuma Consensus parameter controlling how validator stake affects their influence. Higher kappa means stake matters more - large validators dominate. Lower kappa reduces stake influence, giving smaller validators more relative power.
Why This Matters
How much does stake matter in consensus? Kappa determines this. It's a fundamental parameter for understanding power dynamics on a subnet.
Example Scenario
Query Kappa(netuid=1) returns the consensus parameter value. Higher values concentrate power in high-stake validators; lower values distribute influence more evenly.
Common Questions
- What's a typical kappa value?
- Varies by subnet design. Check specific subnet documentation for their intended consensus dynamics.
- Can subnet owners change this?
- Depends on governance. Some parameters are adjustable, others fixed. Changing kappa significantly alters network dynamics.
Use Cases
- Understand how stake affects consensus power
- Research Yuma Consensus parameters
- Model emission distributions
- Design subnet incentive mechanisms
- Debug unexpected consensus outcomes
Purpose & Usage
Purpose
Tune consensus mechanism - controls how stake affects weight processing.
Common Query Patterns
- Query by netuid
- Research consensus behavior
- Understand stake-weight dynamics
Query Keys
| # | Name | Type | Description |
|---|---|---|---|
| 1 | key1 | u16 | key1 (u16) |
Stored Value
value (u16)
Relationships
Modified By
Related Events
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 Kappa storage
const key1 = 0;
const result = await api.query
[stringCamelCase("SubtensorModule")]
[stringCamelCase("Kappa")](
key1
);
console.log("Kappa:", result.toHuman());Runtime Info
View Source- Pallet
- SubtensorModule
- Storage Kind
- Map
- First Version
- v101
- Current Version
- v393