public string[] GetChainData(ParameterClass data)
        {
            MultiChain chain    = new MultiChain();
            var        verified = chain.VerifyMessage(new MessageData {
                address = data.Address, signature = data.Signature, message = data.PhysicianId
            }) == "true";
            var res = chain.GetStreamKeys(data.Streamname);

            var autorisatieStream = this.GetChainName(data.PatientId, data.PhysicianId, authorisation);
            var streamitems       = chain.GetStreamItemByKey(autorisatieStream, authorisation);
            var result            = streamitems == null ? new StreamItem[0] : streamitems.streamitems.ToArray();

            if (result.Any() && this.DeEncryptHexData(result.Last().data).Split(';').Select(f => data.PhysicianId)
                .ToArray().Any())
            {
                var linkarray = new List <string>();
                foreach (var i in res.streamkeys)
                {
                    linkarray.AddRange(chain.GetStreamItemByKey(data.Streamname, i.key).streamitems.Select(f => this.DeEncryptHexData(f.data)).ToArray());
                }

                var datalist = linkarray.Select(f => File.ReadAllText(f.Split('|')[0])).ToArray();

                return(datalist.ToArray());
            }

            return(null);
        }