{
  "manageEntity": {
    "action": "Save",
    "entityId": "380039193",
    "entityType": "Track",
    "nonce": "0xfa3c738cfb887b24dbaeaca98252bad4d99fd61362a46ed7be4ec94736c1c333",
    "signature": "0x72d4a9170ee5b409542219f3ff31e69a5808804e0454588515ea0412718e42cd264a6282e744f927338b416f0f18ab0345180a31d2a0487e7074d69b272e4fcf1c",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}