{
  "manageEntity": {
    "action": "Save",
    "entityId": "537213270",
    "entityType": "Track",
    "nonce": "0x783916a66abe416d465882e9a804b883f08d764a8debfbb02ccb99d58d1c56a1",
    "signature": "0xa734bd360ff4626dc948413f1c79d246c0d6ce3ade912526da7cb130ada88c9f725e65766094c2cfc180ac53029bbe2163510a225853fb8bc802b765b0f3a00e1b",
    "signer": "0x26Feee0AaDc0e2d8f7aBEd5cdb0bCD7D325F618d",
    "userId": "354535"
  }
}