Const
Ref: https://github.com/paritytech/polkadot-sdk/blob/bc53b9a03a742f8b658806a01a7bf853cb9a86cd/substrate/primitives/offchain/src/lib.rs#L25-L37
Ref: https://github.com/paritytech/polkadot-sdk/blob/bc53b9a03a742f8b658806a01a7bf853cb9a86cd/substrate/primitives/offchain/src/lib.rs#L25-L37