{
  "manageEntity": {
    "action": "Save",
    "entityId": "1843664771",
    "entityType": "Track",
    "nonce": "0x2fb82085e1b9da8f5450fc77741136edd2368504bda35c9e312b33ed14e8fe4d",
    "signature": "0xabf1e5a514013d417eb0679dd262856f41d1187b119cf4c9a1e641ff510817ed424a1a1f3ac0ffc03f4b9dc7559be63024905e68cd3b530495614da208db25cb1c",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}