System pallet

Derived from live runtime metadata on TRN root (pallet index 0, captured 2026-05-02). For prose-style documentation see System on the curated reference side.

Pallet index

0

Calls

8

Events

6

Errors

6

Storage items

16

Constants

6

Calls (extrinsics)

System.remark

See [Pallet::remark].

api.tx.system.remark(remark: Bytes)

Argument	Type	Doc
remark	Bytes	Vec<u8>

Call index: 0

System.set_heap_pages

See [Pallet::set_heap_pages].

api.tx.system.set_heap_pages(pages: u64)

Argument	Type	Doc
pages	u64	u64

Call index: 1

System.set_code

See [Pallet::set_code].

api.tx.system.set_code(code: Bytes)

Argument	Type	Doc
code	Bytes	Vec<u8>

Call index: 2

System.set_code_without_checks

See [Pallet::set_code_without_checks].

api.tx.system.set_code_without_checks(code: Bytes)

Argument	Type	Doc
code	Bytes	Vec<u8>

Call index: 3

System.set_storage

See [Pallet::set_storage].

api.tx.system.set_storage(items: Vec<(Bytes,Bytes)>)

Argument	Type	Doc
items	Vec&lt;(Bytes,Bytes)&gt;	Vec<KeyValue>

Call index: 4

System.kill_storage

See [Pallet::kill_storage].

api.tx.system.kill_storage(keys: Vec<Bytes>)

Argument	Type	Doc
keys	Vec&lt;Bytes&gt;	Vec<Key>

Call index: 5

System.kill_prefix

See [Pallet::kill_prefix].

api.tx.system.kill_prefix(prefix: Bytes, subkeys: u32)

Argument	Type	Doc
prefix	Bytes	Key
subkeys	u32	u32

Call index: 6

System.remark_with_event

See [Pallet::remark_with_event].

api.tx.system.remark_with_event(remark: Bytes)

Argument	Type	Doc
remark	Bytes	Vec<u8>

Call index: 7

Events

System.ExtrinsicSuccess

An extrinsic completed successfully.

Field	Type	Doc
dispatch_info	{"weight":"SpWeightsWeightV2Weight","class":"FrameSupportDispatchDispatchClass","paysFee":"FrameSupportDispatchPays"}

System.ExtrinsicFailed

An extrinsic failed.

Field	Type	Doc
dispatch_error	{"_enum":{"Other":"Null","CannotLookup":"Null","BadOrigin":"Null","Module":"SpRuntimeModuleError","ConsumerRemaining":"Null","NoProviders":"Null","TooManyConsumers":"Null","Token":"SpRuntimeTokenError","Arithmetic":"SpArithmeticArithmeticError","Transactional":"SpRuntimeTransactionalError","Exhausted":"Null","Corruption":"Null","Unavailable":"Null","RootNotAllowed":"Null"}}
dispatch_info	{"weight":"SpWeightsWeightV2Weight","class":"FrameSupportDispatchDispatchClass","paysFee":"FrameSupportDispatchPays"}

System.CodeUpdated

:code was updated.

No payload.

System.NewAccount

A new account was created.

Field	Type	Doc
account	[u8;20]

System.KilledAccount

An account was reaped.

Field	Type	Doc
account	[u8;20]

System.Remarked

On on-chain remark happened.

Field	Type	Doc
sender	[u8;20]
hash	H256

Errors

System.InvalidSpecName

The name of specification does not match between the current runtime and the new runtime.

System.SpecVersionNeedsToIncrease

The specification version is not allowed to decrease between the current runtime and the new runtime.

System.FailedToExtractRuntimeVersion

Failed to extract the runtime version from the new runtime. Either calling Core_version or decoding RuntimeVersion failed.

System.NonDefaultComposite

Suicide called when the account has non-default composite data.

System.NonZeroRefCount

There is a non-zero reference count preventing the account from being purged.

System.CallFiltered

The origin filter prevent the call to be dispatched.

Storage

System.Account

The full account information for a particular account ID.

await api.query.system.account(key1)

• Key: [u8;20] (hasher: Blake2_128Concat)
• Returns: {"nonce":"u32","consumers":"u32","providers":"u32","sufficients":"u32","data":"PalletBalancesAccountData"}

Modifier: Default

System.ExtrinsicCount

Total extrinsics count for the current block.

await api.query.system.extrinsicCount()

Returns: u32

Modifier: Optional

System.BlockWeight

The current weight for the block.

await api.query.system.blockWeight()

Returns: {"normal":"SpWeightsWeightV2Weight","operational":"SpWeightsWeightV2Weight","mandatory":"SpWeightsWeightV2Weight"}

Modifier: Default

System.AllExtrinsicsLen

Total length (in bytes) for all extrinsics put together, for the current block.

await api.query.system.allExtrinsicsLen()

Returns: u32

Modifier: Optional

System.BlockHash

Map of block numbers to block hashes.

await api.query.system.blockHash(key1)

• Key: u32 (hasher: Twox64Concat)
• Returns: H256

Modifier: Default

System.ExtrinsicData

Extrinsics data for the current block (maps an extrinsic's index to its data).

await api.query.system.extrinsicData(key1)

• Key: u32 (hasher: Twox64Concat)
• Returns: Bytes

Modifier: Default

System.Number

The current block number being processed. Set by execute_block.

await api.query.system.number()

Returns: u32

Modifier: Default

System.ParentHash

Hash of the previous block.

await api.query.system.parentHash()

Returns: H256

Modifier: Default

System.Digest

Digest of the current block, also part of the block header.

await api.query.system.digest()

Returns: {"logs":"Vec<SpRuntimeDigestDigestItem>"}

Modifier: Default

System.Events

Events deposited for the current block. NOTE: The item is unbound and should therefore never be read on chain. It could otherwise inflate the PoV size of a block. Events have a large in-memory size. Box the events to not go out-of-memory just in case someone still reads them from within the runtime.

await api.query.system.events()

Returns: Vec<FrameSystemEventRecord>

Modifier: Default

System.EventCount

The number of events in the Events<T> list.

await api.query.system.eventCount()

Returns: u32

Modifier: Default

System.EventTopics

Mapping between a topic (represented by T::Hash) and a vector of indexes of events in the <Events<T>> list. All topic vectors have deterministic storage locations depending on the topic. This allows light-clients to leverage the changes trie storage tracking mechanism and in case of changes fetch the list of events of interest. The value has the type (BlockNumberFor<T>, EventIndex) because if we used only just the EventIndex then in case if the topic has the same contents on the next block no notification will be triggered thus the event might be lost.

await api.query.system.eventTopics(key1)

• Key: H256 (hasher: Blake2_128Concat)
• Returns: Vec<(u32,u32)>

Modifier: Default

System.LastRuntimeUpgrade

Stores the spec_version and spec_name of when the last runtime upgrade happened.

await api.query.system.lastRuntimeUpgrade()

Returns: {"specVersion":"Compact<u32>","specName":"Text"}

Modifier: Optional

System.UpgradedToU32RefCount

True if we have upgraded so that type RefCount is u32. False (default) if not.

await api.query.system.upgradedToU32RefCount()

Returns: bool

Modifier: Default

System.UpgradedToTripleRefCount

True if we have upgraded so that AccountInfo contains three types of RefCount. False (default) if not.

await api.query.system.upgradedToTripleRefCount()

Returns: bool

Modifier: Default

System.ExecutionPhase

The execution phase of the block.

await api.query.system.executionPhase()

Returns: {"_enum":{"ApplyExtrinsic":"u32","Finalization":"Null","Initialization":"Null"}}

Modifier: Optional

Constants

System.BlockWeights

Block & extrinsics weights: base values and limits.

Type: {"baseBlock":"SpWeightsWeightV2Weight","maxBlock":"SpWeightsWeightV2Weight","perClass":"FrameSupportDispatchPerDispatchClassWeightsPerClass"}
SCALE-encoded value: 0x0378f3f2b900070010a5d4e813ffffffffffffffffc2a0a91d000107d07b9a4f971366666666666666a6010700cc7b9fae13ffffffffffffffbf010000c2a0a91d000107d0bfc384d11366666666666666e601070010a5d4e813ffffffffffffffff0107004429353a130000000000000040c2a0a91d00000000

System.BlockLength

The maximum length of a block (in bytes).

Type: {"max":"FrameSupportDispatchPerDispatchClassU32"}
SCALE-encoded value: 0x00003c000000500000005000

System.BlockHashCount

Maximum number of block number to block hash mappings to keep (oldest pruned first).

Type: u32
SCALE-encoded value: 0xfa000000

System.DbWeight

The weight of runtime database operations the runtime can invoke.

Type: {"read":"u64","write":"u64"}
SCALE-encoded value: 0x40787d010000000000e1f50500000000

System.Version

Get the chain's current version.

Type: {"specName":"Text","implName":"Text","authoringVersion":"u32","specVersion":"u32","implVersion":"u32","apis":"Vec<([u8;8],u32)>","transactionVersion":"u32","stateVersion":"u8"}
SCALE-encoded value: 0x10726f6f7410726f6f7401000000540000000000000048df6acb689907609b0400000037e397fc7c91f5e40200000040fe3ad401f8959a06000000d2bc9897eed08f1503000000f78b278be53f454c02000000ab3c0572291feb8b01000000bc9d89904f5b923f0100000037c8bb1350a9a2a804000000cbca25e39f14238702000000e65b00e46cedd0aa02000000d246ad053764b1ba0100000037e834f43398ba2d01000000c2ca758b6ccad9eb01000000a958571a3039ac61010000009b8f17f5e08e574601000000582211f65bb14b8905000000ed99c5acb25eedf503000000e377ce9116bcb5f1010000001300000000

System.SS58Prefix

The designated SS58 prefix of this chain. This replaces the "ss58Format" property declared in the chain spec. Reason is that the runtime should know about the prefix in order to make use of it as an identifier of the chain.

Type: u16
SCALE-encoded value: 0xc100

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