subxt 0.50.0

Interact with Substrate based chains on the Polkadot Network
Documentation 
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use crate::config::Config;

/// Signing transactions requires a [`Signer`]. This is responsible for
/// providing the "from" account that the transaction is being signed by,
/// as well as actually signing a SCALE encoded payload.
pub trait Signer<T: Config> {
    /// Return the "from" account ID.
    fn account_id(&self) -> T::AccountId;

    /// Takes a signer payload for an extrinsic, and returns a signature based on it.
    ///
    /// Some signers may fail, for instance because the hardware on which the keys are located has
    /// refused the operation.
    fn sign(&self, signer_payload: &[u8]) -> T::Signature;
}