Dead simple tool to sign files and verify signatures

 Minisign is a dead simple tool to sign files and verify signatures.
 It is portable, lightweight, and uses the highly secure Ed25519
 public-key signature system. Signature files include an untrusted
 comment line that can be freely modified, even after signature
 creation. They also include a second comment line, that cannot be
 modified without the secret key. Trusted comments can be used to add
 instructions or application-specific metadata (intended file name,
 timestamps, resource identifiers, version numbers to prevent
 downgrade attacks).