{
  "manageEntity": {
    "action": "Save",
    "entityId": "1507731566",
    "entityType": "Track",
    "nonce": "0x486dcb35205a00baf02e1cfbf0d9a7a3ffa39f13a07f3f9faf8dd03a635c0f21",
    "signature": "0xdf09f186c84bdd9458397286fa219dccb0e729323fbe77dac96f52ba2c255d62756dcc2de2f9ec0ffd5583ae35f665e3490b556dbc0347b13ed2f3d167837cfb1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}