{
  "manageEntity": {
    "action": "Save",
    "entityId": "840943086",
    "entityType": "Track",
    "nonce": "0xe731603fe411c011f1c798bb13c61a9230e7ff42ba4d2794cbac7a65b855e26a",
    "signature": "0xce95b7476c39320fed8d172388a14eeefde37a9ed117d461c1bda4e63ec1b1c12a25f7433f9567961da5a8810d268e82eb13eb0c03be2aa4fada5faee102c1481b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}