{
  "manageEntity": {
    "action": "Save",
    "entityId": "1506947964",
    "entityType": "Track",
    "nonce": "0x3a19a9d5277d027dfb6af51d8a0c980b65ae03b8358faa9065f52a94017e3705",
    "signature": "0x5c7041d8692c56cac1c4a3a69048c0ec3b3309465dc2a0b57b2662550d59150d377e6bf43108f1387375047a196c4fe4a4a438a64eeaf33f4d6f27d68cc4af481b",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}