/// Durable transaction nonce helpers.
/// Communication with a Solana node over RPC asynchronously .
///
/// Software that interacts with the Solana blockchain, whether querying its
/// state or submitting transactions, communicates with a Solana node over
/// [JSON-RPC], using the [`RpcClient`] type.
///
/// [JSON-RPC]: https://www.jsonrpc.org/specification
/// [`RpcClient`]: crate::nonblocking::rpc_client::RpcClient