/// Returns the chain ID used for transaction signing at the
/// current best block. An empty string is returned if not
#[rpc(name = "parity_chainId")]
fnchain_id(&self) -> Result<Option<U256>, Error>;
/// Get the chain name. Returns one of: "foundation", "kovan", &c. of a filename.
#[rpc(name = "parity_chain")]
fnchain(&self) -> Result<String, Error>;
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