Module frame_system::offchain

Expand description

Module helpers for off-chain calls.

This module provides transaction related helpers to:

Please refer to example-offchain-worker for a concrete example usage of this crate.

To submit a raw unsigned transaction, SubmitTransaction can be used.

To be able to use signing, the following trait should be implemented:

AppCrypto: where an application-specific key is defined and can be used by this module’s helpers for signing.
CreateSignedTransaction: where the manner in which the transaction is constructed is defined.

Initially, a payload instance that implements the SignedPayload trait should be defined. See PricePayload

The payload type that is defined defined can then be signed and submitted onchain.

Signer can be used to sign/verify payloads

Structs

Account
Details of an account for which a private key is contained in the keystore.
ForAll
Marker struct used to flag using all supported keys to sign a payload.
ForAny
Marker struct used to flag using any of the supported keys to sign a payload.
Signer
Provides an implementation for signing transaction payloads.
SubmitTransaction
Provides the ability to directly submit signed and unsigned transaction onchain.

AppCrypto
A type binding runtime-level Public/Signature pair with crypto wrapped by RuntimeAppPublic.
CreateSignedTransaction
Create signed transaction.
SendSignedTransaction
Submit a signed transaction to the transaction pool.
SendTransactionTypes
A definition of types required to submit transactions from within the runtime.
SendUnsignedTransaction
Submit an unsigned transaction onchain with a signed payload
SignMessage
A message signer.
SignedPayload
Utility trait to be implemented on payloads that can be signed.
SigningTypes
A wrapper around the types which are used for signing.