{
  "manageEntity": {
    "action": "Save",
    "entityId": "154178436",
    "entityType": "Track",
    "nonce": "0xfd8a3c08a6bb86f26019ae837a8d970910a39c0072c777983f04a6f08f2a849c",
    "signature": "0x0c7f88586688a2afca80fb35513d1191400e6753a8bfd74e3d79a7e3a74a1e8f06c835c56ede49ff779ad43f3cfbd1e90fc941dceefbb5f4ab49558a587eb0881b",
    "signer": "0x4cd4EAe6AcF1d2fa1Fd61eAce803597613DbaD92",
    "userId": "114543"
  }
}