{
  "manageEntity": {
    "action": "Save",
    "entityId": "1549111371",
    "entityType": "Track",
    "nonce": "0x4dff8382f8159dddd54cf9d5af5afab8c4036adf8448fe625bcd5e69fa95551a",
    "signature": "0xfbe211065e64fc12dbbb845d10cb6b5bf3620262a081c8ea060927db46affc606e3282f462fb85a8d90457442d89e30df51f27c30114f6921a5099c93c8a64691c",
    "signer": "0x18ce7cC21ceFb983971261a224026468F43b56E9",
    "userId": "272851190"
  }
}