{
  "manageEntity": {
    "action": "Save",
    "entityId": "1391296228",
    "entityType": "Track",
    "nonce": "0x66bb4ddaf17562cee3d5aae54863b64edf8da99aba458794e3f9ec32aa8bc0ad",
    "signature": "0xf48c2fadec4d9213592a999e272b4fbbd2f46b5c7c38e6e797e3439ef4ae2451149cbf0e3f9c23ed84500f13006b7a3180156131d390f1b2503b486ba2e779381b",
    "signer": "0x26Feee0AaDc0e2d8f7aBEd5cdb0bCD7D325F618d",
    "userId": "354535"
  }
}