{
  "manageEntity": {
    "action": "Save",
    "entityId": "1897119358",
    "entityType": "Track",
    "nonce": "0xf4aa5ed04c209d7f0df35937ed84de6f259f8e8ad6d4ba8e027f7c4786b811a4",
    "signature": "0xd1b8c034eea6314cb93abf55bc51aedaf18e7574caac5fbe5738657aacbffc892c189c25dcbdcc30d39170314e3156726a5c2b5d9813a03eb1468804670d97901c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}