{
  "manageEntity": {
    "action": "Save",
    "entityId": "1623291410",
    "entityType": "Track",
    "nonce": "0xb1464413e146ea80b720facda044a43ed79b9ff3ee25a2604fbdd709cc5c35f1",
    "signature": "0xd4ba608295227ef04a5f6243eb70503406788cf9b121752c112b7b8334dbba64193ad3410b3d2bec6892b24723802c9e290987863301d7fd624bce8ed3a7edef1b",
    "signer": "0x2B171214e998033E806F72301307B2160CD94DdB",
    "userId": "489165782"
  }
}