{
  "manageEntity": {
    "action": "Save",
    "entityId": "394241619",
    "entityType": "Track",
    "nonce": "0x6cc0f9076dae9cd9344c24e88c85b8f855fff985cb06492d06fdb13585edcc5b",
    "signature": "0xe5b265c2e8d33d958bdeae997b1b9d1e193414e8dc1f32ebb44c102814f67fdb03354490d7563f91bcdd88c0fbd2bb2d4efb8ba6354fd4c46874e92f568ee9da1c",
    "signer": "0xD7c3dC9EEf2D94568C0e1A9C88b58696850c7C22",
    "userId": "125737"
  }
}