{
  "manageEntity": {
    "action": "Save",
    "entityId": "391126",
    "entityType": "Track",
    "nonce": "0xe1d53971668586305e2503c6cf8b3a00a700f2c739bcd3a52eb19c310585f0a7",
    "signature": "0xf09be9ea8aff73ea8bafba1ce097b87fc285ed549c6457698ed5baec8d9dbd6f0690783c42e85f460881589fd4612241d0cada81367ff9152171f15251ce94631c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}