{
  "manageEntity": {
    "action": "Save",
    "entityId": "307780",
    "entityType": "Track",
    "nonce": "0xd890790fd00f3b1be9b57fea62f376add3fbb265c88e995c692600c6ebed27d4",
    "signature": "0x027102fed11c23682f8281f9230d8c8f722a5d66596db02e414d0bd99432650562d1b967e829abfbc7eab4097c1a4b25c3cb60b53be5f32b0e71d6ca613ed7771b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}