{
  "manageEntity": {
    "action": "Save",
    "entityId": "705495848",
    "entityType": "Track",
    "nonce": "0x44f6125d8e91037bd2907345ea6f560a923c5687dd5838dbd1fc7292481f5ebe",
    "signature": "0xd39e817f716302a0fd75f64a41bb124d74c70e3560540986fb61875c721cb87b6aed30ec42dafbd60b6f5c146b1c2b0d1a7604db4233115e1f1070c1d7f40bec1c",
    "signer": "0x2D566E1DaC6fc148a694abe846B32e39B6584aa5",
    "userId": "890889753"
  }
}