{
  "manageEntity": {
    "action": "Save",
    "entityId": "612965701",
    "entityType": "Track",
    "nonce": "0xa19d07ffdf4115cfb7dcc0d0456513782a598fec58c6085d937ed8a3ef57858a",
    "signature": "0x7bcbf61e3cf4f04b4662c7c634498048f570b72249ba94f2e6a4ccafcbb9b2b3275dcce9c123c883cb924729991718ce1a617064baf64ebcb5bb0208478e84461c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}