SignedExchangeSignature(label: String, signature: String, integrity: String, certUrl: String? = null, certSha256: String? = null, validityUrl: String, date: Int, expires: Int, certificates: List<String>? = null)
Information about a signed exchange signature. https://wicg.github.io/webpackage/draft-yasskin-httpbis-origin-signed-exchanges-impl.html#rfc.section.3.1