{
  "manageEntity": {
    "action": "Save",
    "entityId": "964645",
    "entityType": "Track",
    "nonce": "0xc31dbca8a7316c9cfbb6aa584f1359cf9b9ee231fca8b6094ac22e05a3fc2e85",
    "signature": "0x066ff2a27535cdacd34b3ba556c8be4cec0f4100def3f21eb3bf5017e36bf5350c039545745f16d01358059975c8bb4013cfec3babe654eab50e4701fddeecdd1b",
    "signer": "0x354f479338B7F1593E5Ed2Bdb91a09c4bD12996C",
    "userId": "381478870"
  }
}