//! <https://lightning.readthedocs.io/lightning-signmessage.7.html>
//! <https://api.lightning.community/#signmessage>
//! <https://lightning.readthedocs.io/lightning-signmessage.7.html>
//! <https://api.lightning.community/#signmessage>
/// Creates a digital signature of a message given a SecretKey, like the node's secret.
/// A receiver knowing the PublicKey (e.g. the node's id) and the message can be sure that the signature was generated by the caller.
/// Creates a digital signature of a message given a SecretKey, like the node's secret.
/// A receiver knowing the PublicKey (e.g. the node's id) and the message can be sure that the signature was generated by the caller.