Option

Variant 168 v393

Option

About This Type

Flexible address format supporting multiple encoding styles.

Allows specifying an account as Id (AccountId32), Index (u32 account index), Raw bytes, Address32, or Address20. Most commonly used with the Id variant.

Encoding: Variant: 0x00=Id (32 bytes), 0x01=Index (compact u32), 0x02=Raw, 0x03=Address32, 0x04=Address20.

Variants (2)

IndexNameFieldsDocs
0Nonenone
1Some
(u32, u32)

SCALE Encoding

Rule
1-byte variant selects the address format, followed by format-specific data.
Size
variable (1–33 bytes)

Examples

Id variant (AccountId32) = Id(5Grw...QY)
0x00d43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d
00 Variant 0 = Id
d43593c7...56da27d 32-byte AccountId32

Code Examples

import { TypeRegistry } from "@polkadot/types";

const registry = new TypeRegistry();

// Encode Option — variant "None"
const value = registry.createType("Option", "None");
console.log("Hex:", value.toHex());

Type Parameters

T = (u32, u32)

Referenced By (157)

#39 SubtensorModule::Event via SubnetLeaseCreated.end_block#57 Sudo::Event via KeyChanged.old#62 Scheduler::Event via Dispatched.id#62 Scheduler::Event via RetrySet.id#62 Scheduler::Event via RetryCancelled.id#62 Scheduler::Event via CallUnavailable.id#62 Scheduler::Event via PeriodicFailed.id#62 Scheduler::Event via RetryFailed.id#62 Scheduler::Event via PermanentlyOverweight.id#112 WeightsPerClass via max_extrinsic#112 WeightsPerClass via max_total#112 WeightsPerClass via reserved#143 SubtensorModule::Call via swap_hotkey.netuid#143 SubtensorModule::Call via swap_hotkey_v2.netuid#143 SubtensorModule::Call via register_network_with_identity.identity#143 SubtensorModule::Call via remove_stake_full_limit.limit_price#143 SubtensorModule::Call via register_leased_network.end_block#143 SubtensorModule::Call via add_stake_burn.limit#164 Multisig::Call via as_multi.maybe_timepoint#164 Multisig::Call via approve_as_multi.maybe_timepoint

and 137 more...

Type Information

Type ID
168
Kind
Variant
Path
Option
Runtime
v393
Back to Types