message: delete history
diff: @@ -5,13 +5,11 @@ class User {
  constructor() {
  this.ethData = {
  address: '0x0',
  - balance: 0,
  - history: ''
  + balance: 0
  },
  this.btcData = {
  address: '0x0',
  - balance: 0,
  - history: ''
  + balance: 0
  }
  }
  