[−][src]Module frame_system::offchain

Module helpers for off-chain calls.

Overview

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

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.