MinChildKeyTakeSet

Event Re-added v195 → v219, v233 → v247, v252 → v265, v273 → v277, v290 → v315, v320 → current #44

Emitted when minimum child key take rate is changed.

Useful for: validatorsdelegatorssubnet ownersanalytics

The Big Picture

MinChildKeyTake sets the floor for child key commissions. It ensures child keys in validator organizations receive minimum compensation for their participation. Without a minimum, children might be pressured to take 0%, making their participation economically unsustainable.

Why This Matters

If you're a child key (partner in a validator organization), this protects your minimum earning. If you're analyzing validator structures, understanding min and max child take helps you evaluate the full economics of complex validator setups.

Example Scenario

To ensure child keys are fairly compensated, governance sets MinChildKeyTake to 5%. MinChildKeyTakeSet fires. Child keys cannot go below 5% take even if the parent wants them to. This protects partners in validator organizations from exploitation.

Common Questions

Can a child key set 0% take?: Only if MinChildKeyTake is 0. If there's a minimum, they must charge at least that. Check the current MinChildKeyTake constant.
Why would a child key want low take?: To incentivize the parent to allocate more to them. Lower take means more rewards flow through to the child's stakers. But too low might be unsustainable.
Does this apply to all child keys everywhere?: Yes, it's a network-wide parameter. All child keys on all subnets must respect this minimum.

Use Cases

Track minimum commission child keys must charge
Understand child key pricing floors
Monitor validator organization economic policies
Build validator structure compliance tools

How to Use This Event

→ Monitor min take for child key economics
→ Track changes affecting validator partnership structures
→ Build tools showing valid child key take ranges

From Chain Metadata

minimum childkey take set

Triggers

Emitted by

sudo_set_min_childkey_take

Preconditions

Caller has admin/sudo privileges

Effects

Storage Modified

MinChildkeyTake

Postconditions

MinChildKeyTake updated

Side Effects

Child keys cannot set take below this value

Event Data

#	Name	Type	Description
0	arg0	u16	Event field #0 (u16)

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 });

// Subscribe to MinChildKeyTakeSet events
api.query.system.events((events) => {
  events
    .filter(({ event }) =>
      event.section === stringCamelCase("SubtensorModule") &&
      event.method === "MinChildKeyTakeSet"
    )
    .forEach(({ event }) => {
      console.log("MinChildKeyTakeSet:", event.data.toHuman());
    });
});

Version History

Version:

v195 block 3,791,350 1 args

v233 block 4,920,350 1 args

v252 block 5,163,656 1 args

v273 block 5,659,032 1 args

v290 block 5,947,548 1 args

v320 block 6,523,566 1 args Current

Runtime Info

View Source

Pallet Index: 7
Event Index: 44
First Version: v195
Current Version: v393

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