MinChildKeyTakePerSubnetSet

Event v411 → v422, v423 → v424, v432 → v440, v441 → current #47

Emitted when a subnet 's minimum child-key take floor is updated.

Useful for: subnet ownersvalidatorsanalytics

The Big Picture

Subnet owners can require a stricter child-key take minimum than the global floor. This event records each such adjustment.

Use Cases

Track per-subnet child-key take floors
Notify validators that the floor on a subnet they participate in has changed

From Chain Metadata

subnet-specific minimum childkey take set

Part of: Subnet Emission Control

Migration Notes

v424 v432 Breaking

arg0 changed from u16 to NetUid; arg1 changed from u16 to PerU16

Update decoders: SCALE encoding is positional, so any signature change (added, removed, or type-changed fields, or storage shape changes) shifts byte offsets and existing decoders will misparse this item. Re-derive types from the new metadata.

Triggers

Preconditions

sudo_set_min_childkey_take_per_subnet succeeded

Effects

Postconditions

MinChildkeyTakePerSubnet[netuid] updated

Side Effects

Validators on the subnet using a child-key take below the new floor must adjust

Event Data

#	Name	Type	Description
0	arg0 → netuid	NetUid	Subnet whose minimum child-key take was updated
1	arg1 → take	PerU16	New per-subnet minimum child-key take (u16 normalized to u16::MAX, 65535 = 100%)

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);

// Subscribe to MinChildKeyTakePerSubnetSet events
client.finalizedBlock$.subscribe(async (block) => {
  const events = await api.event.SubtensorModule.MinChildKeyTakePerSubnetSet.get(block.hash);
  for (const evt of events) {
    console.log("MinChildKeyTakePerSubnetSet:", evt.payload);
  }
});

Version History

Version:

v411 block 8,283,784 2 args

v423 block 8,486,593 2 args

v432 block 8,636,190 2 args

v441 block 8,765,683 2 args Current

Runtime Info

View Source

Pallet Index: 7
Event Index: 47
First Version: v411
Current Version: v472

Back to SubtensorModule Events