{
  "manageEntity": {
    "action": "Save",
    "entityId": "529976162",
    "entityType": "Track",
    "nonce": "0x1e1904a506173e8c46d98d39676c897ed1b715bf7e04c9a51a411e3b170b3b61",
    "signature": "0x066da7675e638f155a686e5f516f5a72dba32928b01014c13d5b0b924e50af1d7e073ca2c0f6e4302e861705d6d483de5e27e56292e6d25ca2890834110999fe1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}