{
  "manageEntity": {
    "action": "Save",
    "entityId": "1602689883",
    "entityType": "Track",
    "nonce": "0x05f69c13f26f583234c91eea8b3d85b7f49faaf795a2f22327834fbd898ba893",
    "signature": "0x16ac82d38286f73ada70c3b959605c9c217e6222663a3a11a60a3380fce8db8a538757d91a59c27ed0ff3973223a0487c332d82704f6f405ca9f1487e81f99f41c",
    "signer": "0x94e0dDC50579175818AaCFBC9aba8B065fEf2a55",
    "userId": "460147282"
  }
}