SubnetOwnerChanged

Event v411 → v422, v423 → v424, v432 → v440, v441 → current #139

Emitted when subnet ownership transfers to a new coldkey because conviction shifted the lead.

Useful for: subnet ownersanalyticsdevelopers

The Big Picture

Subnet ownership is conviction-weighted in v411 and beyond. When a different coldkey accumulates more conviction than the current owner, ownership transfers. This event is the on-chain record of that transition.

Use Cases

Alert on subnet ownership changes
Track subnet ownership history
Audit conviction-driven governance changes

From Chain Metadata

Subnet ownership was reassigned by lock conviction.

Part of: Lock & Conviction

Migration Notes

v424 v432 Breaking

netuid changed from u16 to NetUid

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

Conviction tally placed a new coldkey ahead of the previous owner
Lock state evaluated at the relevant boundary

Effects

Postconditions

SubnetOwner storage updated to the new coldkey

Side Effects

Subsequent owner-cut allocations route to the new owner
Some owner-permissioned admin calls now belong to the new coldkey

Event Data

#	Name	Type	Description
0	netuid	NetUid	Subnet whose ownership transferred
1	old_coldkey	AccountId	Previous subnet owner coldkey (hex -> SS58)
2	new_coldkey	AccountId	New subnet owner coldkey, decided by conviction tally (hex -> SS58)

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

Version History

Version:

v411 block 8,283,784 3 args

v423 block 8,486,593 3 args

v432 block 8,636,190 3 args

v441 block 8,765,683 3 args Current

Runtime Info

View Source

Pallet Index: 7
Event Index: 139
First Version: v411
Current Version: v472

Back to SubtensorModule Events