report_equivocation
Call v101 → v148, v149 → current #0Reports GRANDPA voter equivocation (double voting) with ownership proof.
View calls on chainCall Workflow
This diagram shows the call execution flow: starting with report_equivocation, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: validatorsdevelopers
The Big Picture
GRANDPA consensus requires honest voting - validators must only vote for one block per round. If a validator votes for two different blocks at the same height (equivocation), they're breaking consensus rules. This call lets anyone submit proof of such misbehavior, which triggers slashing and protects network integrity.
Use Cases
- Report misbehaving GRANDPA validators who vote for conflicting blocks
- Enforce consensus integrity by punishing double voters
- Earn reporter rewards by detecting and reporting equivocations
From Chain Metadata
See [`Pallet::report_equivocation`].
Input Parameters
| # | Name | Type | Description |
|---|---|---|---|
| 0 | equivocation_proof | EquivocationProof Box<EquivocationProof<T::Hash, BlockNumberFor<T>>> | equivocation_proof (EquivocationProof) |
| 1 | key_owner_proof | Void T::KeyOwnerProof | key_owner_proof (Void) |
Permissions
Origin
Unknown
Required Role
Permission data inferred from metadata. May be incomplete.
Requirements
- Equivocation proof is valid and demonstrates double voting
- Key ownership proof validates the offender held the key during that session
- Same equivocation has not already been reported
Effects
Postconditions
- Equivocation offence is recorded on-chain
- Offender may be slashed based on network rules
Side Effects
- May trigger validator slashing
- Offence is added to the offences pallet for processing
Code Examples
// ----------------------------------------------------------------------
// HEADS UP: 1 arg below has a complex type with no usable default.
// Look for `undefined as any` and replace it with real value
// before running — the snippet compiles, but will fail at runtime as-is.
// ----------------------------------------------------------------------
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 report_equivocation call (typed, named args)
const equivocation_proof = undefined as any /* EquivocationProof — replace with real value */;
const tx = api.tx.Grandpa.report_equivocation({
equivocation_proof,
});Version History
v101 block 1 2 args
v149 block 3,014,339 2 args Current
Runtime Info
- Pallet Index
- 4
- Call Index
- 0
- First Version
- v101
- Current Version
- v411