{
  "manageEntity": {
    "action": "Save",
    "entityId": "603054565",
    "entityType": "Track",
    "nonce": "0xfd50a96399b5a22504052a420200a6aab97a38f36f818af29541f5f1db214abb",
    "signature": "0xb7aca6bb262b9d6faafa1cd97526e30fd96987ba24f1759797779872ed5d0b6d2031ec442ab07531e9304077bd2852bcb49bb4010746bf0ea8d17a587455dd821b",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}