docs: def from_signed_raw(cls: Type[CertificationType], signed_raw: str) -> CertificationType:
          """
          Return Certification instance from signed raw document
  
          :param signed_raw: Signed raw document
          :return:
          """
          n = 0
          lines = signed_raw.splitlines(True)
  
          version = int(Identity.parse_field("Version", lines[n]))
          n += 1
  
          Certification.parse_field("Type", lines[n])
          n += 1
  
          currency = Certification.parse_field("Currency", lines[n])
          n += 1
  
          pubkey_from = Certification.parse_field("Issuer", lines[n])
          n += 1
  
          identity_pubkey = Certification.parse_field("IdtyIssuer", lines[n])
          n += 1
  
          identity_uid = Certification.parse_field("IdtyUniqueID", lines[n])
          n += 1
  
          identity_timestamp = BlockUID.from_str(Certification.parse_field("IdtyTimestamp", lines[n]))
          n += 1
  
          identity_signature = Certification.parse_field("IdtySignature", lines[n])
          n += 1
  
          timestamp = BlockUID.from_str(Certification.parse_field("CertTimestamp", lines[n]))
          n += 1
  
          signature = Certification.parse_field("Signature", lines[n])
  
          identity = Identity(version, currency, identity_pubkey, identity_uid, identity_timestamp, identity_signature)
  
          return cls(version, currency, pubkey_from, identity, timestamp, signature)