sudo_set_min_burn
Call v138 → v277, v290 → v298, v301 → v385, v391 → current #22Sets the minimum burn amount for registration on a subnet .
View calls on chainCall Workflow
This diagram shows the call execution flow: starting with sudo_set_min_burn, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch and modifies storage: SubtensorModule.MinBurn, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: subnet owners
The Big Picture
Even when demand is low, burn registration costs at least this much. Prevents trivial slot acquisition.
Use Cases
- Setting registration cost floor
- Preventing spam during low-demand periods
From Chain Metadata
The extrinsic sets the minimum burn for a subnet. It is only callable by root and subnet owner. The extrinsic will call the Subtensor pallet to set the minimum burn.
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
- MinBurn updated
Side Effects
- Burn registration cannot cost less than this
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_min_burn call (typed, named args)
const netuid = 1;
const min_burn = 0n;
const tx = api.tx.AdminUtils.sudo_set_min_burn({
netuid,
min_burn,
});Version History
v138 block 1,907,363 2 args
v290 block 5,947,548 2 args
v301 block 6,205,194 2 args
v391 block 7,782,857 2 args Current
Runtime Info
View Source- Pallet Index
- 19
- Call Index
- 22
- First Version
- v138
- Current Version
- v411