Add block-sync to application.

src/app/_services/transaction.service.ts

@@ -3,11 +3,14 @@ import {HttpClient} from '@angular/common/http';
 import {map} from 'rxjs/operators';
 import {Observable} from 'rxjs';
 import {environment} from '../../environments/environment';
+import {Conversion, Transaction} from '../_models';
 
 @Injectable({
   providedIn: 'root'
 })
 export class TransactionService {
+  transactions: Transaction[] = [];
+  conversions: Conversion[] = [];
 
   constructor(private http: HttpClient) { }
 
@@ -24,4 +27,12 @@ export class TransactionService {
         return response;
       }));
   }
+
+  setTransaction(transaction): void {
+    this.transactions.push(transaction);
+  }
+
+  setConversion(conversion): void {
+    this.conversions.push(conversion);
+  }
 }