{
  "manageEntity": {
    "action": "Save",
    "entityId": "602042764",
    "entityType": "Track",
    "nonce": "0xa4fb533aadcdc30046e1f84b6fc94a568634758d449b08724224dce872b560c9",
    "signature": "0xee0c767df041435176dcbd3e7fb361150dd5a667dbe448d1766f426943064faf587490c7c00f345675a5f28742573800dc3780a1ca38dcadf2c880607a74f7ac1c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}