{
  "manageEntity": {
    "action": "Save",
    "entityId": "763443110",
    "entityType": "Track",
    "nonce": "0x00eb13c85a3d03c36928b510ac29a4b2c8f008cd1c63123d5c53532a45fc369c",
    "signature": "0xf791c60dd7de018c36a9d4781b0f75d08f9a20ecbf43c34c612e5ed7bfe0e3484781c19fe498d967c87b81b849e39b26cd5559e6260dff3eb6911ff6d8f13bdc1c",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}