sudo_set_max_registrations_per_block
Call v138 → v277, v290 → current #27Sets the maximum registrations allowed per block on a subnet .
View calls on chainCall Workflow
This diagram shows the call execution flow: starting with sudo_set_max_registrations_per_block, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch and modifies storage: SubtensorModule.MaxRegistrationsPerBlock, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: subnet owners
The Big Picture
Caps how many neurons can register in a single block. Prevents coordinated registration attacks.
Use Cases
- Preventing registration floods
- Smoothing subnet growth
From Chain Metadata
The extrinsic sets the maximum registrations per block for a subnet. It is only callable by the root account. The extrinsic will call the Subtensor pallet to set the maximum registrations per block.
Input Parameters
Permissions
Origin
Root
Required Role
Permission data inferred from metadata. May be incomplete.
Requirements
- Caller is root or subnet owner
- Subnet exists
Effects
Storage Modified
Postconditions
- MaxRegistrationsPerBlock updated
Side Effects
- Limits burst registration
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);
// Build sudo_set_max_registrations_per_block call (typed, named args)
const netuid = 1;
const max_registrations_per_block = 0;
const tx = api.tx.AdminUtils.sudo_set_max_registrations_per_block({
netuid,
max_registrations_per_block,
});Version History
v138 block 1,907,363 2 args
v290 block 5,947,548 2 args Current
Runtime Info
View Source- Pallet Index
- 19
- Call Index
- 27
- First Version
- v138
- Current Version
- v411