{
  "manageEntity": {
    "action": "Save",
    "entityId": "890542924",
    "entityType": "Track",
    "nonce": "0x50a21b9d03b45065a469f4047265b46fb193c948ffa94c18cc600c512cd0a65a",
    "signature": "0x7d035b7989ce84160904b5bae2a62ae20457b4882832f4d3005759344054958a2a8859f1ffcc9dd988ee77a288aef70d88e7c9aca6385dee677b81950b37f4ab1b",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}