Module frame_system::offchain

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Expand description

Module helpers for off-chain calls.

§Overview

This module provides transaction related helpers to:

  • Submit a raw unsigned transaction
  • Submit an unsigned transaction with a signed payload
  • Submit a signed transaction.

§Usage

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

§Submit a raw unsigned transaction

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

§Signing transactions

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.
§Submit an unsigned transaction with a signed payload

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.

§Submit a signed transaction

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.

Traits§