{
  "manageEntity": {
    "action": "Save",
    "entityId": "599615",
    "entityType": "Track",
    "nonce": "0x2d9840cb7d6b540b23b9a95b17194386bed282ec968a5b809bdd340044ed7b80",
    "signature": "0xc41a3ec43f00bfcae8dc1490509e86a17355a51e99dee077536588083bf9243a437e52a899f05363f159fbbd18acfa64c516073bcec61d86847f3c2b5833eed51b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}