Session pallet

Derived from live runtime metadata on TRN root (pallet index 11, captured 2026-05-02). For prose-style documentation see Session on the curated reference side.

Pallet index

11

Calls

2

Events

1

Errors

5

Storage items

7

Constants

0

Calls (extrinsics)

Session.set_keys

See [Pallet::set_keys].

api.tx.session.set_keys(keys: {"babe":"SpConsensusBabeAppPublic","imOnline":"PalletImOnlineSr25519AppSr25519Public","grandpa":"SpConsensusGrandpaAppPublic","ethy":"SeedPrimitivesEthyCryptoAppCryptoPublic"}, proof: Bytes)

Argument	Type	Doc
keys	{"babe":"SpConsensusBabeAppPublic","imOnline":"PalletImOnlineSr25519AppSr25519Public","grandpa":"SpConsensusGrandpaAppPublic","ethy":"SeedPrimitivesEthyCryptoAppCryptoPublic"}	T::Keys
proof	Bytes	Vec<u8>

Call index: 0

Session.purge_keys

See [Pallet::purge_keys].

api.tx.session.purge_keys()

Call index: 1

Events

Session.NewSession

New session has happened. Note that the argument is the session index, not the block number as the type might suggest.

Field	Type	Doc
session_index	u32

Errors

Session.InvalidProof

Invalid ownership proof.

Session.NoAssociatedValidatorId

No associated validator ID for account.

Session.DuplicatedKey

Registered duplicate key.

Session.NoKeys

No keys are associated with this account.

Session.NoAccount

Key setting account is not live, so it's impossible to associate keys.

Storage

Session.Validators

The current set of validators.

await api.query.session.validators()

Returns: Vec<SeedPrimitivesSignatureAccountId20>

Modifier: Default

Session.CurrentIndex

Current index of the session.

await api.query.session.currentIndex()

Returns: u32

Modifier: Default

Session.QueuedChanged

True if the underlying economic identities or weighting behind the validators has changed in the queued validator set.

await api.query.session.queuedChanged()

Returns: bool

Modifier: Default

Session.QueuedKeys

The queued keys for the next session. When the next session begins, these keys will be used to determine the validator's session keys.

await api.query.session.queuedKeys()

Returns: Vec<(SeedPrimitivesSignatureAccountId20,SeedRuntimeSessionKeys)>

Modifier: Default

Session.DisabledValidators

Indices of disabled validators. The vec is always kept sorted so that we can find whether a given validator is disabled using binary search. It gets cleared when on_session_ending returns a new set of identities.

await api.query.session.disabledValidators()

Returns: Vec<u32>

Modifier: Default

Session.NextKeys

The next session keys for a validator.

await api.query.session.nextKeys(key1)

• Key: [u8;20] (hasher: Twox64Concat)
• Returns: {"babe":"SpConsensusBabeAppPublic","imOnline":"PalletImOnlineSr25519AppSr25519Public","grandpa":"SpConsensusGrandpaAppPublic","ethy":"SeedPrimitivesEthyCryptoAppCryptoPublic"}

Modifier: Optional

Session.KeyOwner

The owner of a key. The key is the KeyTypeId + the encoded key.

await api.query.session.keyOwner(key1)

• Key: (SpCoreCryptoKeyTypeId,Bytes) (hasher: Twox64Concat)
• Returns: [u8;20]

Modifier: Optional

Source: live chain metadata from wss://root.rootnet.live/archive/ws · captured 2026-05-02