{
  "manageEntity": {
    "action": "Save",
    "entityId": "552640",
    "entityType": "Track",
    "nonce": "0x503833424db16bef8ebe7fe5192bd68c95132f499c12bdb151ed6f46a7c7b0ba",
    "signature": "0xafccba6b3f16bd7cae5619ffc0c4bbfaa1a544b22c85bdecc7bd5b83671858d03b813c6630e070a08ef1696cc35ef0bb8c356e30cf0a27a882d1f990ec4702621c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}