{
  "manageEntity": {
    "action": "Save",
    "entityId": "1490703411",
    "entityType": "Track",
    "nonce": "0x56902727b438c677468ac91da290b251c3394e1f09b48fb6f2607a277a496cd6",
    "signature": "0x613a52bea7f274bfaa3e569fa2e309f0e82a706dd715f61e328f8d7fd5525749024a0ec8e458d92ada68feb6cfa3317361c66509023d776d5802b2d2fe67b66b1b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}