{
  "manageEntity": {
    "action": "Save",
    "entityId": "758349",
    "entityType": "Track",
    "nonce": "0x4e5ef128000c720c53b70c3d4cf859ad2b75b2abeeb6708ba20a8c7a06df5008",
    "signature": "0x8213485b7cdda6aafef96c3e5de9c48a871673af44ebbd56cf189bf0bee3bf7c38ed12c5744510d18cb45a98042feb4f0457aa54724bc6c0c88e8875a82f71001b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}